Split up net.java.games.util; moved GLUT and BufferUtils into

net.java.games.jogl.util, and moved demo-specific utility classes into
jogl-demos project under demos.util. Added nearly all JavaOne demos
into jogl-demos project; rewrote where necessary to use
ClassLoader.getResourceAsStream() instead of flat files, put into
packages and added to Makefile. Added gleem to jogl-demos project.
Added jogl.jar build rule.


git-svn-id: file:///usr/local/projects/SUN/JOGL/git-svn/../svn-server-sync/jogl-demos/trunk@3 3298f667-5e0e-4b4a-8ed4-a3559d26a5f4

51 files changed, 8330 insertions, 0 deletions

diff --git a/src/gleem/BSphere.java b/src/gleem/BSphere.java
new file mode 100644
index 0000000..c628bc9
--- /dev/null
+++ b/src/gleem/BSphere.java
@@ -0,0 +1,166 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem;
+
+import gleem.linalg.*;
+
+/** Represents a bounding sphere. */
+
+public class BSphere {
+  private Vec3f center = new Vec3f();
+  private float radius;
+  private float radSq;
+
+  /** Default constructor creates a sphere with center (0, 0, 0) and
+      radius 0 */
+  public BSphere() {
+    makeEmpty();
+  }
+
+  public BSphere(Vec3f center, float radius) {
+    set(center, radius);
+  }
+
+  /** Re-initialize this sphere to center (0, 0, 0) and radius 0 */
+  public void makeEmpty() {
+    center.set(0, 0, 0);
+    radius = radSq = 0;
+  }
+
+  public void  setCenter(Vec3f center) { this.center.set(center); }
+  public Vec3f getCenter()             { return center;           }
+
+  public void  setRadius(float radius) { this.radius = radius;
+                                         radSq = radius * radius; }
+  public float getRadius()             { return radius;           }
+
+  public void set(Vec3f center, float radius) {
+    setCenter(center); setRadius(radius); 
+  }
+  /** Returns radius and mutates passed "center" vector */
+  float get(Vec3f center) {
+    center.set(this.center); return radius;
+  }
+
+  /** Mutate this sphere to encompass both itself and the argument.
+      Ignores zero-size arguments. */
+  public void extendBy(BSphere arg) {
+    if ((radius == 0.0f) || (arg.radius == 0.0f))
+      return;
+    // FIXME: This algorithm is a quick hack -- minimum bounding
+    // sphere of a set of other spheres is a well studied problem, but
+    // not by me
+    Vec3f diff = arg.center.minus(center);
+    if (diff.lengthSquared() == 0.0f) {
+      setRadius(Math.max(radius, arg.radius));
+      return;
+    }
+    IntersectionPoint[] intPt = new IntersectionPoint[4];
+    for (int i = 0; i < intPt.length; i++) {
+      intPt[i] = new IntersectionPoint();
+    }
+    int numIntersections;
+    numIntersections = intersectRay(center, diff, intPt[0], intPt[1]);
+    assert numIntersections == 2;
+    numIntersections = intersectRay(center, diff, intPt[2], intPt[3]);
+    assert numIntersections == 2;
+    IntersectionPoint minIntPt = intPt[0];
+    IntersectionPoint maxIntPt = intPt[0];
+    // Find minimum and maximum t values, take associated intersection
+    // points, find midpoint and half length of line segment -->
+    // center and radius.
+    for (int i = 0; i < 4; i++) {
+      if (intPt[i].getT() < minIntPt.getT()) {
+        minIntPt = intPt[i];
+      } else if (intPt[i].getT() > maxIntPt.getT()) {
+        maxIntPt = intPt[i];
+      }
+    }
+    // Compute the average -- this is the new center
+    center.add(minIntPt.getIntersectionPoint(),
+               maxIntPt.getIntersectionPoint());
+    center.scale(0.5f);
+    // Compute half the length -- this is the radius
+    setRadius(
+      0.5f *
+      minIntPt.getIntersectionPoint().
+        minus(maxIntPt.getIntersectionPoint()).
+          length()
+    );
+  }
+
+  /** Intersect a ray with the sphere. This is a one-sided ray
+      cast. Mutates one or both of intPt0 and intPt1. Returns number
+      of intersections which occurred. */
+  int intersectRay(Vec3f rayStart,
+                   Vec3f rayDirection,
+                   IntersectionPoint intPt0,
+                   IntersectionPoint intPt1) {
+    // Solve quadratic equation
+    float a = rayDirection.lengthSquared();
+    if (a == 0.0)
+      return 0;
+    float b = 2.0f * (rayStart.dot(rayDirection) - rayDirection.dot(center));
+    Vec3f tempDiff = center.minus(rayStart);
+    float c = tempDiff.lengthSquared() - radSq;
+    float disc = b * b - 4 * a * c;
+    if (disc < 0.0f)
+      return 0;
+    int numIntersections;
+    if (disc == 0.0f)
+      numIntersections = 1;
+    else
+      numIntersections = 2;
+    intPt0.setT((0.5f * (-1.0f * b + (float) Math.sqrt(disc))) / a);
+    if (numIntersections == 2)
+      intPt1.setT((0.5f * (-1.0f * b - (float) Math.sqrt(disc))) / a);
+    Vec3f tmp = new Vec3f(rayDirection);
+    tmp.scale(intPt0.getT());
+    tmp.add(tmp, rayStart);
+    intPt0.setIntersectionPoint(tmp);
+    if (numIntersections == 2) {
+      tmp.set(rayDirection);
+      tmp.scale(intPt1.getT());
+      tmp.add(tmp, rayStart);
+      intPt1.setIntersectionPoint(tmp);
+    }
+    return numIntersections;
+  }
+}
diff --git a/src/gleem/BSphereProvider.java b/src/gleem/BSphereProvider.java
new file mode 100644
index 0000000..17b130c
--- /dev/null
+++ b/src/gleem/BSphereProvider.java
@@ -0,0 +1,46 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem;
+
+/** Provides a bounding sphere to an arbitrary client. */
+
+public interface BSphereProvider {
+  public BSphere getBoundingSphere();
+}
diff --git a/src/gleem/CameraParameters.java b/src/gleem/CameraParameters.java
new file mode 100644
index 0000000..658820d
--- /dev/null
+++ b/src/gleem/CameraParameters.java
@@ -0,0 +1,153 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem;
+
+import gleem.linalg.*;
+
+/** Container class for camera's parameters. */
+
+public class CameraParameters {
+  private Vec3f position         = new Vec3f();
+  private Vec3f forwardDirection = new Vec3f();
+  private Vec3f upDirection      = new Vec3f();
+  private Rotf  orientation      = new Rotf();
+  private Mat4f modelviewMatrix  = new Mat4f();
+  private Mat4f projectionMatrix = new Mat4f();
+  float vertFOV;
+  float imagePlaneAspectRatio;
+  int xSize;
+  int ySize;
+
+  public CameraParameters() {}
+
+  public CameraParameters(Vec3f position,
+                          Vec3f forwardDirection,
+                          Vec3f upDirection,
+                          Rotf  orientation,
+                          float vertFOV,
+                          float imagePlaneAspectRatio,
+                          int   xSize,
+                          int   ySize) {
+    setPosition(position);
+    setForwardDirection(forwardDirection);
+    setUpDirection(upDirection);
+    setOrientation(orientation);
+    setVertFOV(vertFOV);
+    setImagePlaneAspectRatio(imagePlaneAspectRatio);
+    setXSize(xSize);
+    setYSize(ySize);
+  }
+
+  public void set(CameraParameters params) {
+    setPosition(params.getPosition());
+    setForwardDirection(params.getForwardDirection());
+    setUpDirection(params.getUpDirection());
+    setVertFOV(params.getVertFOV());
+    setImagePlaneAspectRatio(params.getImagePlaneAspectRatio());
+    setXSize(params.getXSize());
+    setYSize(params.getYSize());
+  }
+
+  /** Sets 3-space origin of camera */
+  public void  setPosition(Vec3f position)           { this.position.set(position);   }
+  /** Gets 3-space origin of camera */
+  public Vec3f getPosition()                         { return position;               }
+  /** Sets 3-space forward direction of camera. Does not need to be
+      normalized. */
+  public void  setForwardDirection(Vec3f fwd)        { forwardDirection.set(fwd);     }
+  /** Gets 3-space forward direction of camera. */
+  public Vec3f getForwardDirection()                 { return forwardDirection;       }
+  /** Sets 3-space upward direction of camera. This must be orthogonal
+      to the viewing direction, but does not need to be normalized. */
+  public void  setUpDirection(Vec3f up)              { upDirection.set(up);           }
+  /** Gets 3-space upward direction of camera. */
+  public Vec3f getUpDirection()                      { return upDirection;            }
+  /** Sets orientation of camera. NOTE: user is responsible for
+      ensuring this corresponds with the up and forward vectors. */
+  public void setOrientation(Rotf orientation)       { this.orientation.set(orientation); }
+  /** Gets orientation of camera. */
+  public Rotf getOrientation()                       { return orientation; }
+  /** Sets the modelview matrix corresponding to the orientation and
+      position of the camera. NOTE: user is responsible for ensuring
+      this corresponds to the rest of the camera parameters. */
+  public void setModelviewMatrix(Mat4f matrix) {
+    modelviewMatrix.set(matrix);
+  }
+  /** Gets the modelview matrix corresponding to the orientation and
+      position of the camera. */
+  public Mat4f getModelviewMatrix() {
+    return modelviewMatrix;
+  }
+  /** Sets the projection matrix corresponding to the camera's
+      field-of-view and aspect ratio parameters. NOTE: user is
+      responsible for ensuring this matrix corresponds to these
+      parameters.*/
+  public void setProjectionMatrix(Mat4f matrix) {
+    projectionMatrix.set(matrix);
+  }
+  /** Gets the projection matrix corresponding to the camera's
+      field-of-view and aspect ratio parameters. */
+  public Mat4f getProjectionMatrix() {
+    return projectionMatrix;
+  }
+  
+  /** Takes HALF of the vertical angular span of the frustum,
+      specified in radians. For example, if your <b>fovy</b> argument
+      to gluPerspective() is 90, then this would be Math.PI / 4. */
+  public void  setVertFOV(float vertFOV)             { this.vertFOV = vertFOV;        }
+  /** Returns HALF of the vertical angular span of the frustum,
+      specified in radians. */
+  public float getVertFOV()                          { return vertFOV;                }
+  /** Sets the aspect ratio of the image plane. Note that this does not
+      necessarily have to correspond to the aspect ratio of the
+      window. */
+  public void  setImagePlaneAspectRatio(float ratio) { imagePlaneAspectRatio = ratio; }
+  /** Gets the aspect ratio of the image plane. */
+  public float getImagePlaneAspectRatio()            { return imagePlaneAspectRatio;  }
+
+  /** Sets the horizontal size of the window, in pixels */
+  public void setXSize(int xSize)                    { this.xSize = xSize;            }
+  /** Gets the horizontal size of the window, in pixels */
+  public int  getXSize()                             { return xSize;                  }
+  /** Sets the vertical size of the window, in pixels */
+  public void setYSize(int ySize)                    { this.ySize = ySize;            }
+  /** Gets the vertical size of the window, in pixels */
+  public int  getYSize()                             { return ySize;                  }
+}
diff --git a/src/gleem/ExaminerViewer.java b/src/gleem/ExaminerViewer.java
new file mode 100644
index 0000000..2cb2f05
--- /dev/null
+++ b/src/gleem/ExaminerViewer.java
@@ -0,0 +1,605 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem;
+
+import java.awt.Dimension;
+import java.awt.event.*;
+import java.util.*;
+
+import gleem.linalg.*;
+import net.java.games.jogl.*;
+
+/** <P> This is an application-level class, not part of the
+    manipulator hierarchy. It is an example of how you might integrate
+    gleem with another application which uses the mouse. </P>
+
+    <P> For the given GLDrawable, the ExaminerViewer takes over the
+    setting of the view position. It passes along mouse events it is
+    not interested in to the ManipManager's mouse routines. </P>
+
+    <P> The ExaminerViewer's controls are similar to those of Open
+    Inventor's Examiner Viewer. Alt + Left mouse button causes
+    rotation about the focal point. Alt + Right mouse button causes
+    translation parallel to the image plane. Alt + both mouse buttons,
+    combined with up/down mouse motion, causes zooming out and in
+    along the view vector. (On platforms with a "Meta" key, that key
+    can be substituted in place of the Alt key.) The method
+    <code>setNoAltKeyMode</code> can be used to cause the
+    ExaminerViewer to take control of all mouse interactions in the
+    window, avoiding the need to hold down the Alt key. </P>
+
+    <P>NOTE: the current ExaminerViewer implementation assumes a
+    minimum of two mouse buttons. For the Mac OS, the code needs to be
+    adjusted to use e.g., the Control key as the "right" mouse
+    button. </P> */
+
+public class ExaminerViewer {
+  private GLDrawable window;
+  /** Simple state machine for figuring out whether we are grabbing
+      events */
+  private boolean interactionUnderway;
+  private boolean iOwnInteraction;
+
+  private boolean noAltKeyMode;
+
+  /** Simple state machine for computing distance dragged */
+  private boolean button1Down;
+  private boolean button2Down;
+  private int numMouseButtons;
+  private int oldNumMouseButtons;
+  private int lastX;
+  private int lastY;
+
+  /** Camera parameters */
+  private float minFocalDist = 1.0f;
+  private Vec3f dolly        = new Vec3f(0, 0, 10); // Amount we have "backed up" from focal point
+  private Vec3f center       = new Vec3f(0, 0,  0); // Position of focal point in world coordinates
+  private Rotf  orientation  = new Rotf();
+  private float rotateSpeed       = 1.0f;
+  private float minRotateSpeed    = 0.0001f;
+  private float dollySpeed        = 2.0f;
+  private float minDollySpeed     = 0.0001f;
+  private float zNear             = 1.0f;
+  private float zFar              = 100.0f;
+  private float vertFOVScale      = 1.0f;
+  private CameraParameters params = new CameraParameters();
+
+  /** Our bounding sphere provider (for viewAll()) */
+  private BSphereProvider provider;
+
+  private MouseMotionAdapter mouseMotionListener = new MouseMotionAdapter() {
+      public void mouseDragged(MouseEvent e) {
+        motionMethod(e, e.getX(), e.getY());
+      }
+
+      public void mouseMoved(MouseEvent e) {
+        passiveMotionMethod(e);
+      }
+    };
+
+  private MouseAdapter mouseListener = new MouseAdapter() {
+      public void mousePressed(MouseEvent e) {
+        mouseMethod(e, e.getModifiers(), true, e.getX(), e.getY());
+      }
+
+      public void mouseReleased(MouseEvent e) {
+        mouseMethod(e, e.getModifiers(), false, e.getX(), e.getY());
+      }
+    };
+
+  private GLEventListener glListener = new GLEventListener() {
+      public void init(GLDrawable drawable) {}
+      public void display(GLDrawable drawable) {}
+      public void reshape(GLDrawable drawable, int x, int y, int width, int height) {
+        reshapeMethod(width, height);
+      }
+      public void displayChanged(GLDrawable drawable, boolean modeChanged, boolean deviceChanged) {}
+    };
+
+  /** The constructor takes the number of mouse buttons on this system
+      (couldn't figure out how to determine this internally) */
+  public ExaminerViewer(int numMouseButtons) {
+    this.numMouseButtons = numMouseButtons;
+    oldNumMouseButtons = numMouseButtons;
+  }
+
+  /** <P> Attaches this ExaminerViewer to the given GLDrawable. This
+      causes the ManipManager's mouse routines to be removed from the
+      window (using ManipManager.removeMouseListeners) and the
+      ExaminerViewer's to be installed. The GLDrawable should be
+      registered with the ManipManager before the ExaminerViewer is
+      attached to it. </P>
+
+      <P> In order for the viewer to do anything useful, you need to
+      provide a BSphereProvider to it to allow "view all"
+      functionality. </P> */
+  public void attach(GLDrawable window, BSphereProvider provider) {
+    this.window = window;
+    this.provider = provider;
+    init();
+    setupListeners();
+  }
+
+  /** Detaches from the given window. This causes the ManipManager's
+      mouse listeners to be reinstalled on the GLDrawable and the
+      ExaminerViewer's to be removed. */
+  public void detach() {
+    removeListeners();
+    this.window = null;
+    this.provider = null;
+  }
+  
+  /** Call this at the end of your display() method to cause the
+      Modelview matrix to be recomputed for the next frame. */
+  public void update(GL gl) {
+    recalc(gl);
+  }
+
+  /** Call this to apply the inverse rotation matrix of the camera to
+      the current matrix. This is useful for drawing a skybox. Does
+      not update which OpenGL matrix is currently being modified or
+      the ExaminerViewer's camera parameters. */
+  public void updateInverseRotation(GL gl) {
+    recalcInverseRotation(gl);
+  }
+
+  /** Call this to force the ExaminerViewer to update its
+      CameraParameters without touching the OpenGL state. */
+  public void update() {
+    recalc();
+  }
+
+  /** Call this from within your display() method to cause the
+      ExaminerViewer to recompute its position based on the visible
+      geometry. A BSphereProvider must have already been set or this
+      method has no effect. */
+  public void viewAll(GL gl) {
+    if (provider == null) {
+      return;
+    }
+    // Figure out how far to move
+    float vertFOV, horizFOV, minFOV;
+    float adjustedVertFOV = params.getVertFOV() * vertFOVScale;
+    vertFOV = 2.0f * adjustedVertFOV;
+    horizFOV = 2.0f * (float) Math.atan(params.getImagePlaneAspectRatio() *
+                                        Math.tan(adjustedVertFOV));
+    if (vertFOV < horizFOV)
+      minFOV = vertFOV;
+    else
+      minFOV = horizFOV;
+    if (minFOV == 0.0f) {
+      throw new RuntimeException("Minimum field of view was zero");
+    }
+    BSphere bsph = provider.getBoundingSphere();
+    float dist = bsph.getRadius() / (float) Math.sin(minFOV / 2.0f);
+    dolly.setZ(dist);
+    center.set(bsph.getCenter());
+    recalc(gl);
+  }
+
+  /** Get the camera parameters out of this Examiner Viewer (for
+      example, to pass to ManipManager.updateCameraParameters()). Note
+      that mutating the returned object is not recommended but
+      regardless will have no effect on the ExaminerViewer. */
+  public CameraParameters getCameraParameters() {
+    return params;
+  }
+
+  /** These routines can be hooked into a GUI by calling them from
+      ActionEvent listeners for buttons elsewhere in the application. */
+  public void rotateFaster() {
+    rotateSpeed *= 2.0f;
+  }
+
+  public void rotateSlower() {
+    if (rotateSpeed < minRotateSpeed)
+      return;
+    else
+      rotateSpeed /= 2.0f;
+  }
+
+  public void dollyFaster() {
+    dollySpeed *= 2.0f;
+  }
+
+  public void dollySlower() {
+    if (dollySpeed < minDollySpeed)
+      return;
+    else
+      dollySpeed /= 2.0f;
+  }
+
+  public float getZNear() {
+    return zNear;
+  }
+
+  public void setZNear(float zNear) {
+    this.zNear = zNear;
+  }
+
+  public float getZFar() {
+    return zFar;
+  }
+
+  public void setZFar(float zFar) {
+    this.zFar = zFar;
+  }
+
+  /** Takes HALF of the vertical angular span of the frustum,
+      specified in radians. For example, if your <b>fovy</b> argument
+      to gluPerspective() is 90, then this would be Math.PI / 4. Note
+      that the ExaminerViewer's algorithms break down if the vertical
+      field of view approaches or exceeds 180 degrees, or Math.PI /
+      2. */
+  public void setVertFOV(float vertFOV) {
+    vertFOVScale = (float) (vertFOV / (Math.PI / 4));
+  }
+
+  /** Sets the position of this ExaminerViewer. */
+  public void setPosition(Vec3f position) {
+    Vec3f tmp = orientation.rotateVector(Vec3f.NEG_Z_AXIS);
+    tmp.scale(dolly.z());
+    center.add(position, tmp);
+  }
+
+  /** Sets the orientation of this ExaminerViewer. */
+  public void setOrientation(Rotf orientation) {
+    this.orientation.set(orientation);
+  }
+
+  public void setNoAltKeyMode(boolean noAltKeyMode) {
+    this.noAltKeyMode = noAltKeyMode;
+    if (noAltKeyMode) {
+      // FIXME: this is a hack to work around Windows' apparently
+      // conflating the alt/meta key with one of the mouse buttons
+      oldNumMouseButtons = numMouseButtons;
+      numMouseButtons = 3;
+    } else {
+      numMouseButtons = oldNumMouseButtons;
+    }
+  }
+
+  public boolean getNoAltKeyMode() {
+    return noAltKeyMode;
+  }
+
+  /** Rotates this ExaminerViewer about the focal point by the
+      specified incremental rotation; performs postmultiplication,
+      i.e. the incremental rotation is applied after the current
+      orientation. */
+  public void rotateAboutFocalPoint(Rotf rot) {
+    orientation = rot.times(orientation);
+    orientation.normalize();
+  }
+
+  //----------------------------------------------------------------------
+  // Internals only below this point
+  //
+
+  private static final float EPSILON = 0.0001f;
+
+  private void setupListeners() {
+    ManipManager.getManipManager().removeMouseListeners(window);
+    window.addMouseMotionListener(mouseMotionListener);
+    window.addMouseListener(mouseListener);
+    window.addGLEventListener(glListener);
+  }
+
+  private void removeListeners() {
+    window.removeMouseMotionListener(mouseMotionListener);
+    window.removeMouseListener(mouseListener);
+    window.removeGLEventListener(glListener);
+    ManipManager.getManipManager().setupMouseListeners(window);
+  }
+
+  private void passiveMotionMethod(MouseEvent e) {
+    ManipManager.getManipManager().mouseMoved(e);
+  }
+
+  private boolean modifiersMatch(MouseEvent e, int mods) {
+    if (noAltKeyMode) {
+      if ((mods & MouseEvent.BUTTON1_MASK) != 0 &&
+          (mods & MouseEvent.BUTTON2_MASK) == 0 &&
+          (mods & MouseEvent.BUTTON3_MASK) == 0) {
+        return (!e.isAltDown() && !e.isMetaDown() && !e.isControlDown() && !e.isShiftDown());
+      } else {
+        // At least on Windows, meta seems to be declared to be down on right button presses
+        return !e.isControlDown() && !e.isShiftDown();
+      }
+    } else {
+      return ((e.isAltDown() || e.isMetaDown()) &&
+              (!e.isControlDown() && !e.isShiftDown()));
+    }
+  }
+
+  private void init() {
+    interactionUnderway = false;
+    iOwnInteraction = false;
+    button1Down = false;
+    button2Down = false;
+
+    Dimension size = window.getSize();
+    int xSize = size.width;
+    int ySize = size.height;
+    params.setOrientation(orientation);
+    params.setPosition(computePosition(new Vec3f()));
+    params.setForwardDirection(Vec3f.NEG_Z_AXIS);
+    params.setUpDirection(Vec3f.Y_AXIS);
+    params.setVertFOV((float) Math.PI / 8.0f);
+    params.setImagePlaneAspectRatio((float) xSize / (float) ySize);
+    params.setXSize(xSize);
+    params.setYSize(ySize);
+  }
+
+  private void motionMethod(MouseEvent e, int x, int y) {
+    if (interactionUnderway && !iOwnInteraction) {
+      ManipManager.getManipManager().mouseDragged(e);
+    } else {
+      int dx = x - lastX;
+      int dy = y - lastY;
+  
+      lastX = x;
+      lastY = y;
+
+      if ((button1Down && (!button2Down))) {
+
+        // Rotation functionality
+        float xRads = (float) Math.PI * -1.0f * dy * rotateSpeed / 1000.0f;
+        float yRads = (float) Math.PI * -1.0f * dx * rotateSpeed / 1000.0f;
+        Rotf xRot = new Rotf(Vec3f.X_AXIS, xRads);
+        Rotf yRot = new Rotf(Vec3f.Y_AXIS, yRads);
+        Rotf newRot = yRot.times(xRot);
+        orientation = orientation.times(newRot);
+
+      } else if (button2Down && (!button1Down)) {
+
+        // Translate functionality
+        // Compute the local coordinate system's difference vector
+        Vec3f localDiff = new Vec3f(dollySpeed * -1.0f * dx / 100.0f,
+                                    dollySpeed * dy / 100.0f,
+                                    0.0f);
+        // Rotate this by camera's orientation
+        Vec3f worldDiff = orientation.rotateVector(localDiff);
+        // Add on to center
+        center.add(worldDiff);
+
+      } else if (button1Down && button2Down) {
+
+        float diff = dollySpeed * -1.0f * dy / 100.0f;
+        float newDolly = dolly.z() + diff;
+        if (newDolly < minFocalDist) {
+          newDolly = minFocalDist;
+        }
+        dolly.setZ(newDolly);
+
+      }
+
+      // Force redraw if window will not do it automatically
+      if (!window.getNoAutoRedrawMode()) {
+        window.display();
+      }
+    }
+  }
+
+  private void mouseMethod(MouseEvent e, int mods, boolean press,
+                           int x, int y) {
+    if ((interactionUnderway && !iOwnInteraction) ||
+        (!modifiersMatch(e, mods))) {
+      // Update state and pass this event along to the ManipManager
+      if (press) {
+        interactionUnderway = true;
+        iOwnInteraction = false;
+        ManipManager.getManipManager().mousePressed(e);
+      } else {
+        interactionUnderway = false;
+        iOwnInteraction = false;
+        ManipManager.getManipManager().mouseReleased(e);
+      }
+    } else {
+      if ((mods & MouseEvent.BUTTON1_MASK) != 0) {
+        if (press) {
+          button1Down = true;
+        } else {
+          button1Down = false;
+        }
+      } else {
+        if (numMouseButtons != 3) {
+          if ((mods & MouseEvent.BUTTON2_MASK) != 0) {
+            if (press) {
+              button2Down = true;
+            } else {
+              button2Down = false;
+            }
+          }
+        } else {
+          // FIXME: must test this on 3-button system
+          if ((mods & MouseEvent.BUTTON3_MASK) != 0) {
+            if (press) {
+              button2Down = true;
+            } else {
+              button2Down = false;
+            }
+          }
+        }
+      }
+
+      lastX = x;
+      lastY = y;
+
+      if (button1Down || button2Down) {
+        interactionUnderway = true;
+        iOwnInteraction = true;
+      } else {
+        interactionUnderway = false;
+        iOwnInteraction = false;
+      }
+
+      // Force redraw if window will not do it automatically
+      if (!window.getNoAutoRedrawMode()) {
+        window.display();
+      }
+    }
+  }
+
+  private void reshapeMethod(int w, int h) {
+    float aspect, theta;
+    aspect = (float) w / (float) h;
+    if (w >= h)
+      theta = 45;
+    else
+      theta = (float) Math.toDegrees(Math.atan(1 / aspect));
+    theta *= vertFOVScale;
+    params.setVertFOV((float) (Math.toRadians(theta) / 2.0));
+    params.setImagePlaneAspectRatio(aspect);
+    params.setXSize(w);
+    params.setYSize(h);
+  }
+
+  private void recalc() {
+    // Recompute position, forward and up vectors
+    Vec3f tmp = new Vec3f();
+    params.setPosition(computePosition(tmp));
+    orientation.rotateVector(Vec3f.NEG_Z_AXIS, tmp);
+    params.setForwardDirection(tmp);
+    orientation.rotateVector(Vec3f.Y_AXIS, tmp);
+    params.setUpDirection(tmp);
+    params.setOrientation(orientation);
+
+    // Compute modelview matrix based on camera parameters, position and
+    // orientation
+    Mat4f tmpMat = new Mat4f();
+    tmpMat.makeIdent();
+    tmpMat.setRotation(orientation);
+    tmpMat.setTranslation(params.getPosition());
+    tmpMat.invertRigid();
+    params.setModelviewMatrix(tmpMat);
+
+    // Compute perspective matrix given camera parameters
+    float deltaZ = zFar - zNear;
+    float aspect = params.getImagePlaneAspectRatio();
+    float radians = params.getVertFOV();
+    float sine = (float) Math.sin(radians);
+    if ((deltaZ == 0) || (sine == 0) || (aspect == 0)) {
+      tmpMat.makeIdent();
+      params.setProjectionMatrix(tmpMat);
+      return;
+    }
+    float cotangent = (float) Math.cos(radians) / sine;
+    tmpMat.makeIdent();
+    tmpMat.set(0, 0, cotangent / aspect);
+    tmpMat.set(1, 1, cotangent);
+    tmpMat.set(2, 2, -(zFar + zNear) / deltaZ);
+    tmpMat.set(3, 2, -1);
+    tmpMat.set(2, 3, -2 * zNear * zFar / deltaZ);
+    tmpMat.set(3, 3, 0);
+    params.setProjectionMatrix(tmpMat);
+
+
+    /********************
+
+    // Recompute position, forward and up vectors
+    params.setPosition(position);
+    Vec3f tmp = new Vec3f();
+    orientation.rotateVector(Vec3f.NEG_Z_AXIS, tmp);
+    params.setForwardDirection(tmp);
+    orientation.rotateVector(Vec3f.Y_AXIS, tmp);
+    params.setUpDirection(tmp);
+    params.setOrientation(orientation);
+
+    // Compute modelview matrix based on camera parameters, position and
+    // orientation
+    Mat4f tmpMat = new Mat4f();
+    tmpMat.makeIdent();
+    tmpMat.setRotation(orientation);
+    tmpMat.setTranslation(position);
+    tmpMat.invertRigid();
+    params.setModelviewMatrix(tmpMat);
+
+    // Compute perspective matrix given camera parameters
+    float deltaZ = zFar - zNear;
+    float aspect = params.getImagePlaneAspectRatio();
+    float radians = params.getVertFOV();
+    float sine = (float) Math.sin(radians);
+    if ((deltaZ == 0) || (sine == 0) || (aspect == 0)) {
+      tmpMat.makeIdent();
+      params.setProjectionMatrix(tmpMat);
+      return;
+    }
+    float cotangent = (float) Math.cos(radians) / sine;
+    tmpMat.makeIdent();
+    tmpMat.set(0, 0, cotangent / aspect);
+    tmpMat.set(1, 1, cotangent);
+    tmpMat.set(2, 2, -(zFar + zNear) / deltaZ);
+    tmpMat.set(3, 2, -1);
+    tmpMat.set(2, 3, -2 * zNear * zFar / deltaZ);
+    tmpMat.set(3, 3, 0);
+    params.setProjectionMatrix(tmpMat);
+
+    **********************/
+  }
+
+  private void recalc(GL gl) {
+    recalc();
+
+    gl.glMatrixMode(GL.GL_MODELVIEW);
+    float[] data = new float[16];
+    params.getModelviewMatrix().getColumnMajorData(data);
+    gl.glLoadMatrixf(data);
+
+    gl.glMatrixMode(GL.GL_PROJECTION);
+    params.getProjectionMatrix().getColumnMajorData(data);
+    gl.glLoadMatrixf(data);
+  }
+
+  private void recalcInverseRotation(GL gl) {
+    Rotf oriInv = orientation.inverse();
+    Vec3f tmp = new Vec3f();
+    float ang = orientation.get(tmp);
+    gl.glLoadIdentity();
+    if (tmp.lengthSquared() > EPSILON)
+      gl.glRotatef((float) Math.toDegrees(ang), tmp.x(), tmp.y(), tmp.z());
+  }
+
+  private Vec3f computePosition(Vec3f tmp) {
+    orientation.rotateVector(dolly, tmp);
+    tmp.add(center);
+    return tmp;
+  }
+}
diff --git a/src/gleem/HandleBoxManip.java b/src/gleem/HandleBoxManip.java
new file mode 100644
index 0000000..bedde65
--- /dev/null
+++ b/src/gleem/HandleBoxManip.java
@@ -0,0 +1,948 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem;
+
+import java.util.*;
+
+import gleem.linalg.*;
+import net.java.games.jogl.*;
+
+/** Patterned after Inventor's HandleBoxManip (by Paul Isaacs and
+    David Mott) and TransformerManip (by Paul Isaacs). Center box
+    allows 3-D translation. Outer six handles allow rotation about the
+    box's six axes. When a handle is clicked, the axis of rotation is
+    immediately chosen as that which is most parallel to the viewing
+    direction (note there are at most two possibilities for the axis
+    of each handle's rotation). Eight corner handles allow aspect
+    ratio-preserving scaling; shift-dragging these handles allows
+    non-uniform scaling in one of two possible directions using a
+    "snap-to-axis" paradigm. These two directions are chosen as the
+    axes of the adjacent face to the handle whose normal most directly
+    faces the viewing direction. */
+
+public class HandleBoxManip extends Manip {
+  private ManipPart parts;
+  private Vec3f translation;
+  private Vec3f scale;
+  private Vec3f geometryScale;
+  private Rotf  rotation;
+  /** Cumulative transform of this object */
+  private Mat4f xform;
+
+  /** Dragging state */
+  private static final int INACTIVE          = 0;
+  private static final int TRANSLATE         = 1;
+  private static final int ROTATE            = 2;
+  // Scaling based on all three axes, preserving current aspect ratio
+  private static final int SCALE_XYZ         = 3;
+  // Scaling along one of two axes (shift key + drag scale handle)
+  private static final int SCALE_SINGLE_AXIS = 4;
+
+  private int      dragState;
+  private Plane    dragPlane;
+  private Vec3f    dragOffset;
+    
+  /** Scale axes */
+  private static final int SCALE_XY = 0;
+  private static final int SCALE_YZ = 1;
+  private static final int SCALE_ZX = 2;
+
+  /** All of the line segments comprising the faces */
+  private ManipPart[] lineSegs;
+
+  static class FaceInfo {
+    ManipPart[] lineSegs;
+    /** The invisible square comprising this face's invisible, but
+	pickable, geometry */
+    ManipPart centerSquare;
+    Vec3f origNormal;
+    Vec3f normal;
+    int scaleAxes;
+
+    FaceInfo() {
+      lineSegs = new ManipPart[4];
+      origNormal = new Vec3f();
+      normal = new Vec3f();
+    }
+  }
+  /** List<FaceInfo> */
+  private List faces;
+  /** List<ManipPart> */
+  private List highlightedGeometry;
+  /** List<ManipPart> */
+  private List draggedGeometry;
+
+  /** Each rotation handle points off to two faces corresponding to
+      the planes in which that handle can rotate. It also points to
+      two circles which appear during dragging to indicate to the user
+      in which plane the manipulator is being rotated. */
+  static class RotateHandleInfo {
+    ManipPart geometry;
+    int faceIdx0;
+    int faceIdx1;
+  }
+  /** List<RotateHandleInfo> */
+  private List      rotateHandles;
+  private PlaneUV   rotatePlane;
+  private float     startAngle;
+  private Rotf      startRot;
+
+  private int scaleAxes;
+  /** Each scale handle points off to its three adjacent faces. */
+  static class ScaleHandleInfo {
+    ManipPart geometry;
+    /** The indices of the three adjacent faces */
+    int[] faceIndices;
+
+    ScaleHandleInfo() {
+      faceIndices = new int[3];
+    }
+  }
+  /** List<ScaleHandleInfo> */
+  private List scaleHandles;
+  // State variables for XYZ scaling
+  /** This line's direction must point outward from the center of the
+      cube. */
+  private Line    scaleXYZLine;
+  private float   origScaleLen;
+  private Vec3f   origScale;
+  // State variables for single-axis scaling
+  private PlaneUV scaleAxisPlane;
+  private Vec3f   scaleAxisOffset;
+  private Vec2f   scaleAxisOrigUV;
+
+  /** Default HandleBoxManip has translation (0, 0, 0) and the
+      identity orientation */
+  public HandleBoxManip() {
+    parts = new ManipPartTwoWayArrow();
+    translation = new Vec3f(0, 0, 0);
+    scale = new Vec3f(1, 1, 1);
+    geometryScale = new Vec3f(1, 1, 1);
+    // Rotf should have a makeIdent() or at least initialize
+    // itself to the unit quaternion (see NOTES.txt)
+    rotation = new Rotf();
+    xform = new Mat4f();
+
+    dragState = INACTIVE;
+    dragPlane = new Plane();
+    dragOffset = new Vec3f();
+    
+    lineSegs = new ManipPart[12];
+
+    faces = new ArrayList();
+    highlightedGeometry = new ArrayList();
+    draggedGeometry = new ArrayList();
+
+    rotateHandles = new ArrayList();
+    rotatePlane = new PlaneUV();
+    startRot = new Rotf();
+
+    scaleHandles = new ArrayList();
+    scaleXYZLine = new Line();
+    origScale = new Vec3f();
+    scaleAxisPlane = new PlaneUV();
+    scaleAxisOffset = new Vec3f();
+    scaleAxisOrigUV = new Vec2f();
+    
+    createGeometry();
+    recalc();
+  }
+  
+  /** Set the translation of this HandleBoxManip. This moves its
+      on-screen representation. Manipulations cause the translation to
+      be modified, not overwritten. */
+  public void setTranslation(Vec3f translation) {
+    this.translation.set(translation);
+    recalc();
+  }
+
+  /** Get the translation of this Translate1Manip. This corresponds to
+      the center of its body. */
+  public Vec3f getTranslation() {
+    return new Vec3f(translation);
+  }
+
+  /** Set the rotation of this HandleBoxManip. */
+  public void setRotation(Rotf rotation) {
+    this.rotation.set(rotation);
+    recalc();
+  }
+
+  /** Get the rotation of this HandleBoxManip. */
+  public Rotf getRotation() {
+    return new Rotf(rotation);
+  }
+
+  /** Set the scale of the HandleBoxManip. This corresponds to the
+      scaling the user has performed. */
+  public void setScale(Vec3f scale) {
+    this.scale.set(scale);
+    recalc();
+  }
+
+  public Vec3f getScale() {
+    return new Vec3f(scale);
+  }
+
+  /** Set the scale of the HandleBoxManip's geometry. This only
+      affects its on-screen representation. It is probably a bad idea
+      to use a non-uniform scale here, because it'd be very confusing
+      to the user. None of the components of the geometryScale vector
+      may be negative. */
+  public void setGeometryScale(Vec3f geometryScale) {
+    this.geometryScale.set(geometryScale);
+    recalc();
+  }
+
+  public Vec3f getGeometryScale() {
+    return new Vec3f(geometryScale);
+  }
+
+  /** Get the cumulative transformation matrix of this
+      HandleBoxManip. */
+  public Mat4f getTransform() {
+    // Transform is Scale, Rotation, Translation applied to incoming
+    // column vectors in that order (SRT, or TRS since column vectors
+    // are right-multiplied)
+    Mat4f dest = new Mat4f();
+    getTransform(dest);
+    return dest;
+  }
+
+  /** Get the cumulative transformation matrix of this HandleBoxManip
+      into the passed matrix. */
+  public void getTransform(Mat4f dest) {
+    Mat4f tmp1 = new Mat4f();
+    Mat4f tmp2 = new Mat4f();
+    tmp1.makeIdent();
+    tmp2.makeIdent();
+    tmp1.setScale(scale);
+    dest.makeIdent();
+    dest.setRotation(rotation);
+    tmp2.mul(dest, tmp1);
+    tmp1.makeIdent();
+    tmp1.setTranslation(translation);
+    dest.mul(tmp1, tmp2);
+  }
+
+  public void render(GL gl) {
+    int i;
+    for (i = 0; i < 12; i++)
+      lineSegs[i].render(gl);
+    for (i = 0; i < rotateHandles.size(); i++)
+      ((RotateHandleInfo) rotateHandles.get(i)).geometry.render(gl);
+    for (i = 0; i < scaleHandles.size(); i++)
+      ((ScaleHandleInfo) scaleHandles.get(i)).geometry.render(gl);
+  }
+
+  public void intersectRay(Vec3f rayStart,
+			   Vec3f rayDirection,
+			   List results) {
+    for (Iterator iter = faces.iterator(); iter.hasNext(); ) {
+      ((FaceInfo) iter.next()).centerSquare.intersectRay(rayStart, rayDirection,
+                                                         results, this);
+    }
+    for (Iterator iter = rotateHandles.iterator(); iter.hasNext(); ) {
+      ((RotateHandleInfo) iter.next()).geometry.intersectRay(rayStart, rayDirection,
+                                                             results, this);
+    }
+    for (Iterator iter = scaleHandles.iterator(); iter.hasNext(); ) {
+      ((ScaleHandleInfo) iter.next()).geometry.intersectRay(rayStart, rayDirection,
+                                                            results, this);
+    }
+  }
+
+  public void highlight(HitPoint hit) {
+    ManipPart part = hit.manipPart;
+    // Search for this part in the FaceInfo array
+    for (Iterator iter = faces.iterator(); iter.hasNext(); ) {
+      FaceInfo info = (FaceInfo) iter.next();
+      if (info.centerSquare == part) {
+        for (int j = 0; j < 4; j++) {
+          info.lineSegs[j].highlight();
+          highlightedGeometry.add(info.lineSegs[j]);
+        }
+        return;
+      }
+    }
+
+    // Otherwise, was a rotation or scale handle
+    part.highlight();
+    highlightedGeometry.add(part);
+  }
+  
+  public void clearHighlight() {
+    for (Iterator iter = highlightedGeometry.iterator(); iter.hasNext(); ) {
+      ((ManipPart) iter.next()).clearHighlight();
+    }
+    highlightedGeometry.clear();
+  }
+
+  public void makeActive(HitPoint hit) {
+    // Find which piece of geometry it is
+    for (Iterator iter = faces.iterator(); iter.hasNext(); ) {
+      FaceInfo face = (FaceInfo) iter.next();
+      if (face.centerSquare == hit.manipPart) {
+        dragState = TRANSLATE;
+        dragPlane.setPoint(hit.intPt.getIntersectionPoint());
+        dragPlane.setNormal(face.normal);
+        dragOffset.sub(translation, hit.intPt.getIntersectionPoint());
+        for (int j = 0; j < 4; j++) {
+          face.lineSegs[j].highlight();
+          draggedGeometry.add(face.lineSegs[j]);
+        }
+        return;
+      }
+    }
+
+    for (Iterator iter = rotateHandles.iterator(); iter.hasNext(); ) {
+      RotateHandleInfo rotInfo = (RotateHandleInfo) iter.next();
+      if (rotInfo.geometry == hit.manipPart) {
+        dragState = ROTATE;
+        // Determine which direction we're rotating by taking dot
+        // products of the ray direction with the rotating planes'
+        // normals
+        float dotp0 =
+          Math.abs(hit.rayDirection.dot(((FaceInfo) faces.get(rotInfo.faceIdx0)).normal));
+        float dotp1 =
+          Math.abs(hit.rayDirection.dot(((FaceInfo) faces.get(rotInfo.faceIdx1)).normal));
+        int faceIdx;
+        if (dotp0 > dotp1)
+          faceIdx = rotInfo.faceIdx0;
+        else
+          faceIdx = rotInfo.faceIdx1;
+        FaceInfo face = (FaceInfo) faces.get(faceIdx);
+        // Set up the rotation plane
+        rotatePlane.setOrigin(translation);
+        rotatePlane.setNormal(face.normal);
+        Vec3f dummy = new Vec3f();
+        Vec2f startUV = new Vec2f();
+        rotatePlane.projectPoint(hit.intPt.getIntersectionPoint(), dummy, startUV);
+        startAngle = (float) Math.atan2(startUV.y(), startUV.x());
+        startRot.set(rotation);
+        rotInfo.geometry.highlight();
+        draggedGeometry.add(rotInfo.geometry);
+        return;
+      }
+    }
+
+    for (Iterator iter = scaleHandles.iterator(); iter.hasNext(); ) {
+      ScaleHandleInfo info = (ScaleHandleInfo) iter.next();
+      if (info.geometry == hit.manipPart) {
+        if (hit.shiftDown) {
+          dragState = SCALE_SINGLE_AXIS;
+          // Figure out which are the two axes along which we're
+          // going to allow scaling by taking dot products of the
+          // ray direction with the normals of the adjacent faces
+          // to the scale handle.
+          float dotp = 0.0f;
+          float tmpDotp;
+          int faceIdx = 0;
+          for (int i = 0; i < 3; i++) {
+            FaceInfo faceInfo = (FaceInfo) faces.get(info.faceIndices[i]);
+            tmpDotp = faceInfo.normal.dot(hit.rayDirection);
+            if ((i == 0) || (tmpDotp < dotp)) {
+              dotp = tmpDotp;
+              faceIdx = info.faceIndices[i];
+            }
+          }
+          scaleAxes = ((FaceInfo) faces.get(faceIdx)).scaleAxes;
+          Vec3f uAxisOrig = new Vec3f();
+          Vec3f vAxisOrig = new Vec3f();
+          if (scaleAxes == SCALE_XY) {
+            uAxisOrig.set(1, 0, 0);
+            vAxisOrig.set(0, 1, 0);
+          } else if (scaleAxes == SCALE_YZ) {
+            uAxisOrig.set(0, 1, 0);
+            vAxisOrig.set(0, 0, 1);
+          } else {
+            uAxisOrig.set(0, 0, 1);
+            vAxisOrig.set(1, 0, 0);
+          }
+          Vec3f uAxis = new Vec3f();
+          Vec3f vAxis = new Vec3f();
+          Mat4f rotationTmpMat = new Mat4f();
+          rotationTmpMat.makeIdent();
+          rotationTmpMat.setRotation(rotation);
+          rotationTmpMat.xformDir(uAxisOrig, uAxis);
+          rotationTmpMat.xformDir(vAxisOrig, vAxis);
+          Vec3f normal = new Vec3f();
+          normal.cross(uAxis, vAxis);
+          scaleAxisPlane.setNormalAndUV(normal, uAxis, vAxis);
+          // We need to be able to constrain the scaling to be
+          // nonnegative.
+          Vec3f newOrigin = new Vec3f();
+          Vec2f foo = new Vec2f();
+          scaleAxisPlane.projectPoint(translation, newOrigin, foo);
+          scaleAxisPlane.setOrigin(newOrigin);
+          scaleAxisOffset.sub(hit.intPt.getIntersectionPoint(), newOrigin);
+          // Now project intersection point onto plane
+          Vec3f bar = new Vec3f();
+          scaleAxisPlane.projectPoint(hit.intPt.getIntersectionPoint(),
+                                      bar, scaleAxisOrigUV);
+          // Put the plane back where it was
+          scaleAxisPlane.setOrigin(hit.intPt.getIntersectionPoint());
+          origScale.set(scale);
+        } else {
+          dragState = SCALE_XYZ;
+          scaleXYZLine.setPoint(hit.intPt.getIntersectionPoint());
+          Vec3f scaleDiffVec = new Vec3f();
+          scaleDiffVec.sub(hit.intPt.getIntersectionPoint(), translation);
+          scaleXYZLine.setDirection(scaleDiffVec);
+          origScale.set(scale);
+          origScaleLen = scaleDiffVec.length();
+        }
+        info.geometry.highlight();
+        draggedGeometry.add(info.geometry);
+        return;
+      }
+    }
+
+    throw new RuntimeException("Couldn't find intersected piece of geometry");
+  }
+
+  public void drag(Vec3f rayStart,
+		   Vec3f rayDirection) {
+    if (dragState == TRANSLATE) {
+      // Algorithm: Find intersection of ray with dragPlane. Add
+      // dragOffset to this point to get new translation.
+      IntersectionPoint intPt = new IntersectionPoint();
+      if (dragPlane.intersectRay(rayStart,
+                                 rayDirection,
+                                 intPt) == false) {
+        // Ray is parallel to plane. Punt.
+        return;
+      }
+      translation.add(intPt.getIntersectionPoint(), dragOffset);
+      recalc();
+    } else if (dragState == ROTATE) {
+      IntersectionPoint intPt = new IntersectionPoint();
+      Vec2f uvCoords = new Vec2f();
+      if (rotatePlane.intersectRay(rayStart,
+                                   rayDirection,
+                                   intPt,
+                                   uvCoords) == false) {
+        // Ray is parallel to plane. Punt.
+        return;
+      }
+      // Compute offset rotation angle
+      Rotf offsetRot = new Rotf();
+      offsetRot.set(rotatePlane.getNormal(),
+                    (float) Math.atan2(uvCoords.y(), uvCoords.x()) - startAngle);
+      rotation.mul(offsetRot, startRot);
+      recalc();
+    } else if (dragState == SCALE_XYZ) {
+      Vec3f closestPt = new Vec3f();
+      boolean gotPt = scaleXYZLine.closestPointToRay(rayStart,
+                                                     rayDirection,
+                                                     closestPt);
+      if (gotPt) {
+        // How far have we moved?
+        // Clamp scale to be positive.
+        Vec3f newDiffVec = new Vec3f();
+        newDiffVec.sub(closestPt, translation);
+        if (newDiffVec.dot(scaleXYZLine.getDirection()) < 0) {
+          scale.set(0, 0, 0);
+        } else {
+          float scaleChange = newDiffVec.length() / origScaleLen;
+          scale.set(origScale);
+          scale.scale(scaleChange);
+        }
+        recalc();	  
+      }
+    } else if (dragState == SCALE_SINGLE_AXIS) {
+      IntersectionPoint intPt = new IntersectionPoint();
+      Vec2f uvCoords = new Vec2f();
+      if (scaleAxisPlane.intersectRay(rayStart, rayDirection, intPt, uvCoords)) {
+        Vec2f faceCenteredUVCoords = new Vec2f();
+        Vec3f foo = new Vec3f();
+        Vec3f tmp = new Vec3f();
+        tmp.set(intPt.getIntersectionPoint());
+        tmp.add(scaleAxisOffset);
+        scaleAxisPlane.projectPoint(tmp, foo, faceCenteredUVCoords);
+        if ((MathUtil.sgn(faceCenteredUVCoords.x()) ==
+             MathUtil.sgn(scaleAxisOrigUV.x())) &&
+            (MathUtil.sgn(faceCenteredUVCoords.y()) ==
+             MathUtil.sgn(scaleAxisOrigUV.y()))) {
+          if (faceCenteredUVCoords.x() < 0)
+            uvCoords.setX(uvCoords.x() * -1);
+          if (faceCenteredUVCoords.y() < 0)
+            uvCoords.setY(uvCoords.y() * -1);
+          Vec3f scaleVec = new Vec3f();
+          if (Math.abs(uvCoords.x()) > Math.abs(uvCoords.y())) {
+            if (scaleAxes == SCALE_XY)
+              scaleVec.setX(uvCoords.x());
+            else if (scaleAxes == SCALE_YZ)
+              scaleVec.setY(uvCoords.x());
+            else
+              scaleVec.setZ(uvCoords.x());
+          } else {
+            if (scaleAxes == SCALE_XY)
+              scaleVec.setY(uvCoords.y());
+            else if (scaleAxes == SCALE_YZ)
+              scaleVec.setZ(uvCoords.y());
+            else
+              scaleVec.setX(uvCoords.y());
+          }
+          scaleVec.setX(scaleVec.x() / geometryScale.x());
+          scaleVec.setY(scaleVec.y() / geometryScale.y());
+          scaleVec.setZ(scaleVec.z() / geometryScale.z());
+          scale.add(origScale, scaleVec);
+          // This shouldn't be necessary anymore
+          /*
+            if (scale.x() < 0)
+            scale.setX(0);
+            if (scale.y() < 0)
+            scale.setY(0);
+            if (scale.z() < 0)
+            scale.setZ(0);
+          */
+        } else {
+          if (Math.abs(uvCoords.x()) > Math.abs(uvCoords.y())) {
+            if (scaleAxes == SCALE_XY)
+              scale.setX(0);
+            else if (scaleAxes == SCALE_YZ)
+              scale.setY(0);
+            else
+              scale.setZ(0);
+          } else {
+            if (scaleAxes == SCALE_XY)
+              scale.setY(0);
+            else if (scaleAxes == SCALE_YZ)
+              scale.setZ(0);
+            else
+              scale.setX(0);
+          }
+        }
+        recalc();
+      }
+    } else {
+      throw new RuntimeException("HandleBoxManip::drag: ERROR: Unexpected drag state");
+    }
+    super.drag(rayStart, rayDirection);
+  }
+
+  public void makeInactive() {
+    dragState = INACTIVE;
+    for (Iterator iter = draggedGeometry.iterator(); iter.hasNext(); ) {
+      ((ManipPart) iter.next()).clearHighlight();
+    }
+    draggedGeometry.clear();
+  }
+  
+  //----------------------------------------------------------------------
+  // Internals only below this point
+  //
+
+  private void createGeometry() {
+    ManipPartGroup group = new ManipPartGroup();
+
+    //
+    // Lines
+    //
+
+    // Top face:
+    // Front line
+    lineSegs[0] = createLineSeg(new Vec3f(0, 1, 1),
+                                new Vec3f(1, 0, 0),
+                                new Vec3f(0, 1, 0));
+    // Left line
+    lineSegs[1] = createLineSeg(new Vec3f(-1, 1, 0),
+                                new Vec3f(0, 0, 1),
+                                new Vec3f(0, 1, 0));
+    // Back line
+    lineSegs[2] = createLineSeg(new Vec3f(0, 1, -1),
+                                new Vec3f(1, 0, 0),
+                                new Vec3f(0, 1, 0));
+    // Right line
+    lineSegs[3] = createLineSeg(new Vec3f(1, 1, 0),
+                                new Vec3f(0, 0, 1),
+                                new Vec3f(0, 1, 0));
+    // Middle segments:
+    // Front left
+    lineSegs[4] = createLineSeg(new Vec3f(-1, 0, 1),
+                                new Vec3f(0, -1, 0),
+                                new Vec3f(1, 0, 0));
+    // Back left
+    lineSegs[5] = createLineSeg(new Vec3f(-1, 0, -1),
+                                new Vec3f(0, -1, 0),
+                                new Vec3f(1, 0, 0));
+    // Back right
+    lineSegs[6] = createLineSeg(new Vec3f(1, 0, -1),
+                                new Vec3f(0, -1, 0),
+                                new Vec3f(1, 0, 0));
+    // Front right
+    lineSegs[7] = createLineSeg(new Vec3f(1, 0, 1),
+                                new Vec3f(0, -1, 0),
+                                new Vec3f(1, 0, 0));
+    // Bottom face:
+    // Front line
+    lineSegs[8] = createLineSeg(new Vec3f(0, -1, 1),
+                                new Vec3f(1, 0, 0),
+                                new Vec3f(0, 1, 0));
+    // Left line
+    lineSegs[9] = createLineSeg(new Vec3f(-1, -1, 0),
+                                new Vec3f(0, 0, 1),
+                                new Vec3f(0, 1, 0));
+    // Back line
+    lineSegs[10] = createLineSeg(new Vec3f(0, -1, -1),
+                                 new Vec3f(1, 0, 0),
+                                 new Vec3f(0, 1, 0));
+    // Right line
+    lineSegs[11] = createLineSeg(new Vec3f(1, -1, 0),
+                                 new Vec3f(0, 0, 1),
+                                 new Vec3f(0, 1, 0));
+
+    for (int i = 0; i < 12; i++) {
+      group.addChild(lineSegs[i]);
+    }
+
+    //
+    // Faces
+    //
+
+    // Front face (index 0)
+    FaceInfo info = new FaceInfo();
+    info.origNormal.set(0, 0, 1);
+    info.centerSquare =
+      createFace(info.origNormal, info.origNormal, new Vec3f(0, 1, 0));
+    info.lineSegs[0] = lineSegs[0];
+    info.lineSegs[1] = lineSegs[4];
+    info.lineSegs[2] = lineSegs[7];
+    info.lineSegs[3] = lineSegs[8];
+    info.scaleAxes = SCALE_XY;
+    faces.add(info);
+    // Right face (index 1)
+    info = new FaceInfo();
+    info.origNormal.set(1, 0, 0);
+    info.centerSquare =
+      createFace(info.origNormal, info.origNormal, new Vec3f(0, 1, 0));
+    info.lineSegs[0] = lineSegs[3];
+    info.lineSegs[1] = lineSegs[6];
+    info.lineSegs[2] = lineSegs[7];
+    info.lineSegs[3] = lineSegs[11];
+    info.scaleAxes = SCALE_YZ;
+    faces.add(info);
+    // Back face (index 2)
+    info = new FaceInfo();
+    info.origNormal.set(0, 0, -1);
+    info.centerSquare =
+      createFace(info.origNormal, info.origNormal, new Vec3f(0, 1, 0));
+    info.lineSegs[0] = lineSegs[2];
+    info.lineSegs[1] = lineSegs[5];
+    info.lineSegs[2] = lineSegs[6];
+    info.lineSegs[3] = lineSegs[10];
+    info.scaleAxes = SCALE_XY;
+    faces.add(info);
+    // Left face (index 3)
+    info = new FaceInfo();
+    info.origNormal.set(-1, 0, 0);
+    info.centerSquare =
+      createFace(info.origNormal, info.origNormal, new Vec3f(0, 1, 0));
+    info.lineSegs[0] = lineSegs[1];
+    info.lineSegs[1] = lineSegs[4];
+    info.lineSegs[2] = lineSegs[5];
+    info.lineSegs[3] = lineSegs[9];
+    info.scaleAxes = SCALE_YZ;
+    faces.add(info);
+    // Top face (index 4)
+    info = new FaceInfo();
+    info.origNormal.set(0, 1, 0);
+    info.centerSquare =
+      createFace(info.origNormal, info.origNormal, new Vec3f(0, 0, -1));
+    info.lineSegs[0] = lineSegs[0];
+    info.lineSegs[1] = lineSegs[1];
+    info.lineSegs[2] = lineSegs[2];
+    info.lineSegs[3] = lineSegs[3];
+    info.scaleAxes = SCALE_ZX;
+    faces.add(info);
+    // Bottom face (index 5)
+    info = new FaceInfo();
+    info.origNormal.set(0, -1, 0);
+    info.centerSquare =
+      createFace(info.origNormal, info.origNormal, new Vec3f(0, 0, 1));
+    info.lineSegs[0] = lineSegs[8];
+    info.lineSegs[1] = lineSegs[9];
+    info.lineSegs[2] = lineSegs[10];
+    info.lineSegs[3] = lineSegs[11];
+    info.scaleAxes = SCALE_ZX;
+    faces.add(info);
+
+    for (Iterator iter = faces.iterator(); iter.hasNext(); ) {
+      group.addChild(((FaceInfo) iter.next()).centerSquare);
+    }
+
+    //
+    // Rotation handles
+    //
+
+    // Front handle. Rotates about top/bottom and left/right faces.
+    // Maintain references to top and right faces.
+    RotateHandleInfo rotInfo = new RotateHandleInfo();
+    rotInfo.faceIdx0 = 4;
+    rotInfo.faceIdx1 = 1;
+    rotInfo.geometry = createRotateHandle(new Vec3f(0, 0, 1));
+    rotateHandles.add(rotInfo);
+    // Right handle. Rotates about top/bottom and front/back faces.
+    // Maintain references to top and front faces.
+    rotInfo = new RotateHandleInfo();
+    rotInfo.faceIdx0 = 4;
+    rotInfo.faceIdx1 = 0;
+    rotInfo.geometry = createRotateHandle(new Vec3f(1, 0, 0));
+    rotateHandles.add(rotInfo);
+    // Back handle. Rotates about top/bottom and left/right faces.
+    // Maintain references to top and right faces.
+    rotInfo = new RotateHandleInfo();
+    rotInfo.faceIdx0 = 4;
+    rotInfo.faceIdx1 = 1;
+    rotInfo.geometry = createRotateHandle(new Vec3f(0, 0, -1));
+    rotateHandles.add(rotInfo);
+    // Left handle. Rotates about top/bottom and front/back faces.
+    // Maintain references to top and front faces.
+    rotInfo = new RotateHandleInfo();
+    rotInfo.faceIdx0 = 4;
+    rotInfo.faceIdx1 = 0;
+    rotInfo.geometry = createRotateHandle(new Vec3f(-1, 0, 0));
+    rotateHandles.add(rotInfo);
+    // Top handle. Rotates about front/back and left/right faces.
+    // Maintain references to front and right faces.
+    rotInfo = new RotateHandleInfo();
+    rotInfo.faceIdx0 = 0;
+    rotInfo.faceIdx1 = 1;
+    rotInfo.geometry = createRotateHandle(new Vec3f(0, 1, 0));
+    rotateHandles.add(rotInfo);
+    // Bottom handle. Rotates about front/back and left/right faces.
+    // Maintain references to front and right faces.
+    rotInfo = new RotateHandleInfo();
+    rotInfo.faceIdx0 = 0;
+    rotInfo.faceIdx1 = 1;
+    rotInfo.geometry = createRotateHandle(new Vec3f(0, -1, 0));
+    rotateHandles.add(rotInfo);
+
+    for (Iterator iter = rotateHandles.iterator(); iter.hasNext(); ) {
+      group.addChild(((RotateHandleInfo) iter.next()).geometry);
+    }
+
+    // Scale handles
+    // Top right front (order: front right top)
+    ScaleHandleInfo scaleInfo = new ScaleHandleInfo();
+    scaleInfo.geometry = createScaleHandle(new Vec3f(1, 1, 1));
+    scaleInfo.faceIndices[0] = 0;
+    scaleInfo.faceIndices[1] = 1;
+    scaleInfo.faceIndices[2] = 4;
+    scaleHandles.add(scaleInfo);
+    // Top right back (order: right back top)
+    scaleInfo = new ScaleHandleInfo();
+    scaleInfo.geometry = createScaleHandle(new Vec3f(1, 1, -1));
+    scaleInfo.faceIndices[0] = 1;
+    scaleInfo.faceIndices[1] = 2;
+    scaleInfo.faceIndices[2] = 4;
+    scaleHandles.add(scaleInfo);
+    // Bottom right front (order: front right bottom)
+    scaleInfo = new ScaleHandleInfo();
+    scaleInfo.geometry = createScaleHandle(new Vec3f(1, -1, 1));
+    scaleInfo.faceIndices[0] = 0;
+    scaleInfo.faceIndices[1] = 1;
+    scaleInfo.faceIndices[2] = 5;
+    scaleHandles.add(scaleInfo);
+    // Bottom right back (order: right back bottom)
+    scaleInfo = new ScaleHandleInfo();
+    scaleInfo.geometry = createScaleHandle(new Vec3f(1, -1, -1));
+    scaleInfo.faceIndices[0] = 1;
+    scaleInfo.faceIndices[1] = 2;
+    scaleInfo.faceIndices[2] = 5;
+    scaleHandles.add(scaleInfo);
+    // Top left front (order: front left top)
+    scaleInfo = new ScaleHandleInfo();
+    scaleInfo.geometry = createScaleHandle(new Vec3f(-1, 1, 1));
+    scaleInfo.faceIndices[0] = 0;
+    scaleInfo.faceIndices[1] = 3;
+    scaleInfo.faceIndices[2] = 4;
+    scaleHandles.add(scaleInfo);
+    // Top left back (order: back left top)
+    scaleInfo = new ScaleHandleInfo();
+    scaleInfo.geometry = createScaleHandle(new Vec3f(-1, 1, -1));
+    scaleInfo.faceIndices[0] = 2;
+    scaleInfo.faceIndices[1] = 3;
+    scaleInfo.faceIndices[2] = 4;
+    scaleHandles.add(scaleInfo);
+    // Bottom left front (order: front left bottom)
+    scaleInfo = new ScaleHandleInfo();
+    scaleInfo.geometry = createScaleHandle(new Vec3f(-1, -1, 1));
+    scaleInfo.faceIndices[0] = 0;
+    scaleInfo.faceIndices[1] = 3;
+    scaleInfo.faceIndices[2] = 5;
+    scaleHandles.add(scaleInfo);
+    // Bottom left back (order: back left bottom)
+    scaleInfo = new ScaleHandleInfo();
+    scaleInfo.geometry = createScaleHandle(new Vec3f(-1, -1, -1));
+    scaleInfo.faceIndices[0] = 2;
+    scaleInfo.faceIndices[1] = 3;
+    scaleInfo.faceIndices[2] = 5;
+    scaleHandles.add(scaleInfo);
+
+    for (Iterator iter = scaleHandles.iterator(); iter.hasNext(); ) {
+      group.addChild(((ScaleHandleInfo) iter.next()).geometry);
+    }
+
+    parts = group;
+  }
+
+  private ManipPart createLineSeg(Vec3f translation,
+                                  Vec3f xAxis,
+                                  Vec3f yAxis) {
+    ManipPartTransform xform = new ManipPartTransform();
+    ManipPartLineSeg lineSeg = new ManipPartLineSeg();
+    xform.addChild(lineSeg);
+    Mat4f offset = new Mat4f();
+    offset.makeIdent();
+    Vec3f zAxis = new Vec3f();
+    zAxis.cross(xAxis, yAxis);
+    offset.set(0, 0, xAxis.x());
+    offset.set(1, 0, xAxis.y());
+    offset.set(2, 0, xAxis.z());
+    offset.set(0, 1, yAxis.x());
+    offset.set(1, 1, yAxis.y());
+    offset.set(2, 1, yAxis.z());
+    offset.set(0, 2, zAxis.x());
+    offset.set(1, 2, zAxis.y());
+    offset.set(2, 2, zAxis.z());
+    offset.set(0, 3, translation.x());
+    offset.set(1, 3, translation.y());
+    offset.set(2, 3, translation.z());
+    xform.setOffsetTransform(offset);
+    return xform;
+  }
+
+  private ManipPart createFace(Vec3f translation,
+                               Vec3f normal,
+                               Vec3f up) {
+    ManipPartTransform xform = new ManipPartTransform();
+    ManipPartSquare square   = new ManipPartSquare();
+    square.setVisible(false);
+    xform.addChild(square);
+    Mat4f offset = new Mat4f();
+    offset.makeIdent();
+    Vec3f right = new Vec3f();
+    right.cross(up, normal);
+    offset.set(0, 0, right.x());
+    offset.set(1, 0, right.y());
+    offset.set(2, 0, right.z());
+    offset.set(0, 1, up.x());
+    offset.set(1, 1, up.y());
+    offset.set(2, 1, up.z());
+    offset.set(0, 2, normal.x());
+    offset.set(1, 2, normal.y());
+    offset.set(2, 2, normal.z());
+    offset.set(0, 3, translation.x());
+    offset.set(1, 3, translation.y());
+    offset.set(2, 3, translation.z());
+    xform.setOffsetTransform(offset);
+    return xform;
+  }
+
+  private ManipPart createRotateHandle(Vec3f direction) {
+    ManipPartCube handle = new ManipPartCube();
+    Mat4f offset = new Mat4f();
+    offset.makeIdent();
+    offset.set(0, 0, 0.1f);
+    offset.set(1, 1, 0.1f);
+    offset.set(2, 2, 0.1f);
+    Vec3f scaledDirection = new Vec3f(direction);
+    scaledDirection.scale(2.0f);
+    offset.setTranslation(scaledDirection);
+    ManipPartTransform xform = new ManipPartTransform();
+    xform.addChild(handle);
+    xform.setOffsetTransform(offset);
+    return xform;
+  }
+
+  private ManipPart createScaleHandle(Vec3f position) {
+    ManipPartCube handle = new ManipPartCube();
+    Mat4f offset = new Mat4f();
+    offset.makeIdent();
+    offset.set(0, 0, 0.1f);
+    offset.set(1, 1, 0.1f);
+    offset.set(2, 2, 0.1f);
+    offset.setTranslation(position);
+    ManipPartTransform xform = new ManipPartTransform();
+    xform.addChild(handle);
+    xform.setOffsetTransform(offset);
+    return xform;
+  }
+
+  private void recalc() {
+    // Construct local to world transform for geometry.
+    // Scale, Rotation, Translation. Since we're right multiplying
+    // column vectors, the actual matrix composed is TRS.
+    Mat4f scaleMat = new Mat4f();
+    Mat4f rotMat   = new Mat4f();
+    Mat4f xlateMat = new Mat4f();
+    Mat4f tmpMat   = new Mat4f();
+    scaleMat.makeIdent();
+    scaleMat.set(0, 0, scale.x() * geometryScale.x());
+    scaleMat.set(1, 1, scale.y() * geometryScale.y());
+    scaleMat.set(2, 2, scale.z() * geometryScale.z());
+    rotMat.makeIdent();
+    rotMat.setRotation(rotation);
+    xlateMat.makeIdent();
+    xlateMat.set(0, 3, translation.x());
+    xlateMat.set(1, 3, translation.y());
+    xlateMat.set(2, 3, translation.z());
+    tmpMat.mul(xlateMat, rotMat);
+    xform.mul(tmpMat, scaleMat);
+    int i;
+    for (i = 0; i < 12; i++) {
+      lineSegs[i].setTransform(xform);
+    }
+    for (i = 0; i < faces.size(); i++) {
+      FaceInfo face = (FaceInfo) faces.get(i);
+      face.centerSquare.setTransform(xform);
+      xform.xformDir(face.origNormal, face.normal);
+      face.normal.normalize();
+      
+      RotateHandleInfo rotInfo = (RotateHandleInfo) rotateHandles.get(i);
+      rotInfo.geometry.setTransform(xform);
+    }
+    for (i = 0; i < scaleHandles.size(); i++) {
+      ((ScaleHandleInfo) scaleHandles.get(i)).geometry.setTransform(xform);
+    }
+  }
+}
diff --git a/src/gleem/HitPoint.java b/src/gleem/HitPoint.java
new file mode 100644
index 0000000..1eb7151
--- /dev/null
+++ b/src/gleem/HitPoint.java
@@ -0,0 +1,73 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem;
+
+import gleem.linalg.*;
+
+/** Defines an intersection of a ray with a piece of a manipulator */
+
+public class HitPoint {
+  /** Was the shift key down while this HitPoint was computed? */
+  public boolean shiftDown;
+
+  /** The manipulator which was intersected */
+  public Manip manipulator;
+
+  /** The sub-piece of the manipulator which was actually intersected */
+  public ManipPart manipPart;
+  
+  /** Start of the ray which was cast. The manipulator part must set
+      this when an intersection is detected. */
+  public Vec3f rayStart;
+  /** Direction of the ray which was cast. The manipulator part must
+      set this when an intersection is detected. */
+  public Vec3f rayDirection;
+
+  // Not all ManipParts supply all of these pieces of information.
+
+  /** The combination of 3D point and t parameter at which the
+      intersection occurred. It's important to supply the t parameter
+      because the ManipManager needs it to disambiguate between
+      intersections with multiple manipulators. */
+  public IntersectionPoint intPt;
+
+  /** Arbitrary user data for extended functionality */
+  public Object userData;
+}
diff --git a/src/gleem/Manip.java b/src/gleem/Manip.java
new file mode 100644
index 0000000..b037430
--- /dev/null
+++ b/src/gleem/Manip.java
@@ -0,0 +1,120 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem;
+
+import java.util.*;
+
+import gleem.linalg.*;
+import net.java.games.jogl.*;
+
+/** The base class for all manipulators. Fundamentally a manipulator
+    must support a ray cast operation with itself and logic to
+    understand what to do when that ray cast actually made the
+    manipulator active. */
+
+public abstract class Manip {
+  private List motionListeners;
+
+  public Manip() {
+    motionListeners = new LinkedList();
+
+    // FIXME: The ManipManager's list should probably be maintained
+    // with weak references
+    //    ManipManager.getManipManager().registerManip(this);
+  }
+
+  /** Returns true if the addition was successful, false otherwise */
+  public boolean    addMotionListener(ManipMotionListener l) {
+    return motionListeners.add(l);
+  }
+
+  /** Returns true if the removal was successful, false otherwise */
+  public boolean removeMotionListener(ManipMotionListener l) {
+    return motionListeners.remove(l);
+  }
+
+  /** Cast a ray in 3-space from the camera start position in the
+      specified direction and test for intersections against all live
+      portions of this manipulator. Add all hits, in arbitrary order,
+      to the end of the given list in the form of HitPoints. Must not
+      modify the results vector in any other way (i.e., must not
+      remove any existing HitPoints from the results vector). */
+  public abstract void intersectRay(Vec3f rayStart,
+				    Vec3f rayDirection,
+				    List results);
+
+  /** Tell the manipulator to highlight the current portion of itself.
+      This is merely visual feedback to the user. */
+  public abstract void highlight(HitPoint hit);
+  
+  /** Tell the manipulator to clear the current highlight */
+  public abstract void clearHighlight();
+
+  /** If the ManipManager decides that this manipulator is to become
+      active, it will pass back the HitPoint which made it make its
+      decision. The manipulator can then change its state to look for
+      drags of this portion of the manipulator. */
+  public abstract void makeActive(HitPoint hit);
+
+  /** When a manipulator is active, drags of the live portion cause
+      motion of the manipulator. The ManipManager keeps track of which
+      manipulator (if any) is active and takes care of calling the
+      drag() method with the current ray start and direction. The
+      manipulator must keep enough state to understand how it should
+      position and/or rotate itself. NOTE that the base class provides
+      an implementation for this method which you must call at the end
+      of your overriding method. */
+  public void drag(Vec3f rayStart,
+		   Vec3f rayDirection) {
+    for (Iterator iter = motionListeners.iterator(); iter.hasNext(); ) {
+      ManipMotionListener m = (ManipMotionListener) iter.next();
+      m.manipMoved(this);
+    }
+  }
+  
+  /** When the mouse button is released, makeInactive() is called. The
+      manipulator should reset its state in preparation for the next
+      drag. */
+  public abstract void makeInactive();
+
+  /** Render this Manipulator now using the given OpenGL routines and
+      assuming an OpenGL context is current. */
+  public abstract void render(GL gl);
+}
diff --git a/src/gleem/ManipManager.java b/src/gleem/ManipManager.java
new file mode 100644
index 0000000..0a0d86d
--- /dev/null
+++ b/src/gleem/ManipManager.java
@@ -0,0 +1,404 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem;
+
+import java.awt.event.*;
+import java.util.*;
+
+import gleem.linalg.*;
+
+import net.java.games.jogl.*;
+
+/** The ManipManager handles making manipulators visible in a
+    window. */
+
+public class ManipManager {
+  // Screen-to-ray mapping
+  private ScreenToRayMapping mapping;
+  private static ManipManager soleInstance;
+  // Maps GLDrawables to WindowInfos
+  private Map windowToInfoMap = new HashMap();
+  // Maps Manips to Set<GLDrawable>
+  private Map manipToWindowMap = new HashMap();
+
+  // MouseAdapter for this
+  private MouseAdapter mouseListener = new MouseAdapter() {
+      public void mousePressed(MouseEvent e) {
+        ManipManager.this.mousePressed(e);
+      }
+
+      public void mouseReleased(MouseEvent e) {
+        ManipManager.this.mouseReleased(e);
+      }
+    };
+  private MouseMotionAdapter mouseMotionListener = new MouseMotionAdapter() {
+      public void mouseDragged(MouseEvent e) {
+        ManipManager.this.mouseDragged(e);
+      }
+
+      public void mouseMoved(MouseEvent e) {
+        ManipManager.this.mouseMoved(e);
+      }
+    };
+  private WindowUpdateListener defaultWindowListener = new WindowUpdateListener() {
+      public void update(GLDrawable window) {
+        if (!window.getNoAutoRedrawMode()) {
+          window.display();
+        }
+      }
+    };
+  private WindowUpdateListener windowListener;
+
+  class WindowInfo {
+    /** Set<Manip> */
+    Set manips = new HashSet();
+    CameraParameters params = new CameraParameters();
+    Manip curHighlightedManip;
+    ManipPart curHighlightedManipPart;
+    // Current manip
+    Manip curManip;
+    // Dragging?
+    boolean dragging;
+  }
+
+  /** This class is a singleton. Get the sole instance of the
+      ManipManager. */
+  public static synchronized ManipManager getManipManager() {
+    if (soleInstance == null) {
+      soleInstance = new ManipManager();
+    }
+    return soleInstance;
+  }
+
+  /** Make the ManipManager aware of the existence of a given
+      window. This causes mouse and mouse motion listeners to be
+      installed on this window; see setupMouseListeners, below. */
+  public synchronized void registerWindow(GLDrawable window) {
+    windowToInfoMap.put(window, new WindowInfo());
+    setupMouseListeners(window);
+  }
+
+  /** Remove all references to a given window, including removing all
+      manipulators from it. */
+  public synchronized void unregisterWindow(GLDrawable window) {
+    WindowInfo info = (WindowInfo) windowToInfoMap.get(window);
+    for (Iterator iter = info.manips.iterator(); iter.hasNext(); ) {
+      removeManipFromWindow((Manip) iter.next(), window);
+    }
+    windowToInfoMap.remove(window);
+    removeMouseListeners(window);
+  }
+
+  /** Make a given manipulator visible and active in a given
+      window. The window must be registered. */
+  public synchronized void showManipInWindow(Manip manip, GLDrawable window) {
+    WindowInfo info = (WindowInfo) windowToInfoMap.get(window);
+    if (info == null) {
+      throw new RuntimeException("Window not registered");
+    }
+    info.manips.add(manip);
+    Set windows = (Set) manipToWindowMap.get(manip);
+    if (windows == null) {
+      windows = new HashSet();
+      manipToWindowMap.put(manip, windows);
+    }
+    windows.add(window);
+  }
+
+  /** Remove a given manipulator from a given window. The window must
+      be registered. */
+  public synchronized void removeManipFromWindow(Manip manip, GLDrawable window) {
+    WindowInfo info = (WindowInfo) windowToInfoMap.get(window);
+    if (info == null) {
+      throw new RuntimeException("Window not registered");
+    }
+    if (!info.manips.remove(manip)) {
+      throw new RuntimeException("Manip not registered in window");
+    }
+    Set windows = (Set) manipToWindowMap.get(manip);
+    assert windows != null;
+    windows.remove(window);
+  }
+
+  /** This must be called for a registered window every time the
+      camera parameters of the window change. */
+  public synchronized void updateCameraParameters(GLDrawable window, CameraParameters params) {
+    WindowInfo info = (WindowInfo) windowToInfoMap.get(window);
+    if (info == null) {
+      throw new RuntimeException("Window not registered");
+    }
+    info.params.set(params);
+  }
+
+  /** Allows changing of the screen-to-ray mapping. Default is a
+      RightTruncPyrMapping. */
+  public synchronized void setScreenToRayMapping(ScreenToRayMapping mapping) {
+    this.mapping = mapping;
+  }
+
+  /** Returns the current screen-to-ray mapping. */
+  public synchronized ScreenToRayMapping getScreenToRayMapping() {
+    return mapping;
+  }
+
+  /** Sets the WindowUpdateListener the ManipManager uses to force
+      repainting of windows in which manipulators have moved. The
+      default implementation, which can be restored by passing a null
+      listener argument to this method, calls repaint() on the
+      GLDrawable if it is not a GLRunnable instance (i.e., a
+      GLAnimCanvas or GLAnimJPanel, which redraw themselves
+      automatically). */
+  public synchronized void setWindowUpdateListener(WindowUpdateListener listener) {
+    if (listener != null) {
+      windowListener = listener;
+    } else {
+      windowListener = defaultWindowListener;
+    }
+  }
+
+  /** Cause the manipulators for a given window to be drawn. The
+      drawing occurs immediately; this routine must be called when an
+      OpenGL context is valid, i.e., from within the display() method
+      of a GLEventListener. */
+  public synchronized void render(GLDrawable window, GL gl) {
+    WindowInfo info = (WindowInfo) windowToInfoMap.get(window);
+    if (info == null) {
+      throw new RuntimeException("Window not registered");
+    }
+    for (Iterator iter = info.manips.iterator(); iter.hasNext(); ) {
+      ((Manip) iter.next()).render(gl);
+    }
+  }
+
+  /** Sets up a MouseListener and MouseMotionListener for the given
+      window. Since an application-level MouseListener or
+      MouseMotionListener might want to intercept events and not pass
+      them on to the ManipManager without relying on the ordering of
+      listeners for the canvas (see the ExaminerViewer class), the
+      setupMouseListeners and removeMouseListeners routines, as well
+      as the appropriate delegate routines, are made public here. */
+  public synchronized void setupMouseListeners(GLDrawable window) {
+    window.addMouseMotionListener(mouseMotionListener);
+    window.addMouseListener(mouseListener);
+  }
+
+  /** Removes the automatically-installed mouse listeners for the
+      given window. This allows application code to determine the
+      policy for intercepting mouse events. */
+  public synchronized void removeMouseListeners(GLDrawable window) {
+    window.removeMouseMotionListener(mouseMotionListener);
+    window.removeMouseListener(mouseListener);
+  }
+
+  /** The ManipManager watches for the following events: mouseMoved,
+      mouseDragged, mousePressed, and mouseReleased. These routines
+      are exposed so application-level code can intercept events when
+      certain modifier keys are depressed. */
+  public synchronized void mouseMoved(MouseEvent e) {
+    passiveMotionMethod((GLDrawable) e.getComponent(), e.getX(), e.getY());
+  }
+
+  /** The ManipManager watches for the following events: mouseMoved,
+      mouseDragged, mousePressed, and mouseReleased. These routines
+      are exposed so application-level code can intercept events when
+      certain modifier keys are depressed. */
+  public synchronized void mouseDragged(MouseEvent e) {
+    motionMethod((GLDrawable) e.getComponent(), e.getX(), e.getY());
+  }
+
+  /** The ManipManager watches for the following events: mouseMoved,
+      mouseDragged, mousePressed, and mouseReleased. These routines
+      are exposed so application-level code can intercept events when
+      certain modifier keys are depressed. */
+  public synchronized void mousePressed(MouseEvent e) {
+    mouseMethod((GLDrawable) e.getComponent(), e.getModifiers(),
+                true, e.getX(), e.getY());
+  }
+
+  /** The ManipManager watches for the following events: mouseMoved,
+      mouseDragged, mousePressed, and mouseReleased. These routines
+      are exposed so application-level code can intercept events when
+      certain modifier keys are depressed. */
+  public synchronized void mouseReleased(MouseEvent e) {
+    mouseMethod((GLDrawable) e.getComponent(), e.getModifiers(),
+                false, e.getX(), e.getY());
+  }
+
+  //----------------------------------------------------------------------
+  // Internals only below this point
+  //
+
+  private ManipManager() {
+    mapping = new RightTruncPyrMapping();
+    setWindowUpdateListener(null);
+  }
+
+  private void motionMethod(GLDrawable window, int x, int y) {
+    WindowInfo info = (WindowInfo) windowToInfoMap.get(window);
+    if (info.dragging) {
+      // Compute ray in 3D
+      Vec3f rayStart     = new Vec3f();
+      Vec3f rayDirection = new Vec3f();
+      computeRay(info.params, x, y, rayStart, rayDirection);
+      info.curManip.drag(rayStart, rayDirection);
+      fireUpdate(info.curManip);
+    }
+  }
+
+  private void passiveMotionMethod(GLDrawable window, int x, int y) {
+    WindowInfo info = (WindowInfo) windowToInfoMap.get(window);
+    // Compute ray in 3D
+    Vec3f rayStart     = new Vec3f();
+    Vec3f rayDirection = new Vec3f();
+    computeRay(info.params, x, y, rayStart, rayDirection);
+    // Compute all hits
+    List hits = new ArrayList();
+    for (Iterator iter = info.manips.iterator(); iter.hasNext(); ) {
+      ((Manip) iter.next()).intersectRay(rayStart, rayDirection, hits);
+    }
+    // Find closest one
+    HitPoint hp = null;
+    for (Iterator iter = hits.iterator(); iter.hasNext(); ) {
+      HitPoint cur = (HitPoint) iter.next();
+      if ((hp == null) || (cur.intPt.getT() < hp.intPt.getT())) {
+        hp = cur;
+      }
+    }
+    if (info.curHighlightedManip != null &&
+        (hp == null ||
+         hp.manipulator != info.curHighlightedManip ||
+         hp.manipPart != info.curHighlightedManipPart)) {
+      info.curHighlightedManip.clearHighlight();
+      fireUpdate(info.curHighlightedManip);
+    }
+    if (hp != null) {
+      if (hp.manipulator != info.curHighlightedManip ||
+          hp.manipPart != info.curHighlightedManipPart) {
+        // Highlight manip
+        info.curHighlightedManip = hp.manipulator;
+        info.curHighlightedManipPart = hp.manipPart;
+        info.curHighlightedManip.highlight(hp);
+        fireUpdate(info.curHighlightedManip);
+      }
+    } else {
+      info.curHighlightedManip = null;
+    }
+  }
+
+  private void mouseMethod(GLDrawable window, int modifiers,
+                           boolean isPress, int x, int y) {
+    if ((modifiers & InputEvent.BUTTON1_MASK) != 0) {
+      WindowInfo info = (WindowInfo) windowToInfoMap.get(window);
+
+      if (isPress) {
+        // Compute ray in 3D
+        Vec3f rayStart     = new Vec3f();
+        Vec3f rayDirection = new Vec3f();
+        computeRay(info.params, x, y, rayStart, rayDirection);
+        // Compute all hits
+        List hits = new ArrayList();
+        for (Iterator iter = info.manips.iterator(); iter.hasNext(); ) {
+          ((Manip) iter.next()).intersectRay(rayStart, rayDirection, hits);
+        }
+        // Find closest one
+        HitPoint hp = null;
+        for (Iterator iter = hits.iterator(); iter.hasNext(); ) {
+          HitPoint cur = (HitPoint) iter.next();
+          if ((hp == null) || (cur.intPt.getT() < hp.intPt.getT())) {
+            hp = cur;
+          }
+        }
+        if (hp != null) {
+          if (info.curHighlightedManip != null) {
+            info.curHighlightedManip.clearHighlight();
+            fireUpdate(info.curHighlightedManip);
+            info.curHighlightedManip = null;
+          }
+
+          if ((modifiers & InputEvent.SHIFT_MASK) != 0) {
+            hp.shiftDown = true;
+          }
+
+          hp.manipulator.makeActive(hp);
+          info.curManip = hp.manipulator;
+          info.dragging = true;
+          fireUpdate(info.curManip);
+        }
+      } else {
+        if (info.curManip != null) {
+          info.curManip.makeInactive();
+          info.dragging = false;
+          fireUpdate(info.curManip);
+          info.curManip = null;
+          // Check to see where mouse is
+          passiveMotionMethod(window, x, y);
+        }
+      }
+    }
+  }
+
+  private Vec2f screenToNormalizedCoordinates(CameraParameters params,
+                                              int x, int y) {
+    // AWT's origin is upper left
+    return new Vec2f(
+      (((float) x / (float) (params.xSize - 1)) - 0.5f) * 2.0f,
+      (0.5f - ((float) y / (float) (params.ySize - 1))) * 2.0f
+    );
+  }
+
+  private void computeRay(CameraParameters params, int x, int y,
+                          Vec3f raySource, Vec3f rayDirection) {
+    if (mapping == null) {
+      throw new RuntimeException("Screen to ray mapping was unspecified");
+    }
+    mapping.mapScreenToRay(screenToNormalizedCoordinates(params, x, y),
+                           params,
+                           raySource,
+                           rayDirection);
+  }
+
+  private void fireUpdate(Manip manip) {
+    Set windows = (Set) manipToWindowMap.get(manip);
+    assert windows != null;
+    for (Iterator iter = windows.iterator(); iter.hasNext(); ) {
+      windowListener.update((GLDrawable) iter.next());
+    }
+  }
+}
diff --git a/src/gleem/ManipMotionListener.java b/src/gleem/ManipMotionListener.java
new file mode 100644
index 0000000..45059a7
--- /dev/null
+++ b/src/gleem/ManipMotionListener.java
@@ -0,0 +1,47 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem;
+
+/** The interface which clients to the gleem library implement to
+    receive notification that a manipulator has moved. */
+
+public interface ManipMotionListener {
+  public void manipMoved(Manip manip);
+}
diff --git a/src/gleem/ManipPart.java b/src/gleem/ManipPart.java
new file mode 100644
index 0000000..50fbe61
--- /dev/null
+++ b/src/gleem/ManipPart.java
@@ -0,0 +1,94 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem;
+
+import java.util.*;
+
+import gleem.linalg.*;
+import net.java.games.jogl.*;
+
+/** A ManipPart is a visible or invisible sub-part of a manipulator.
+    ManipParts are organized into trees. */
+
+public abstract class ManipPart {
+  private ManipPartGroup parent;
+
+  /** Get the parent ManipPartGroup, or null if none (NOTE that this
+      differs from the C++ API) */
+  public ManipPartGroup getParent() {
+    return parent;
+  }
+
+  /** Set the parent ManipPartGroup of this ManipPart (NOTE that this
+      differs from the C++ API) */
+  public void setParent(ManipPartGroup parent) {
+    this.parent = parent;
+  }
+  
+  /** Intersect a ray with this part, returning all intersected points
+      as HitPoints in the result list. The same rules as
+      Manip.intersectRay() apply. */
+  public abstract void intersectRay(Vec3f rayStart,
+				    Vec3f rayDirection,
+				    List results,
+				    Manip caller);
+  
+  /** Sets the transform of this part. */
+  public abstract void setTransform(Mat4f xform);
+
+  /** Highlight this part */
+  public abstract void highlight();
+
+  /** Unhighlight this part */
+  public abstract void clearHighlight();
+
+  /** Is this part pickable, or just decorative? Not pickable implies
+      that intersectRay() will return immediately. */
+  public abstract void setPickable(boolean pickable);
+  public abstract boolean getPickable();
+
+  /** Is this part visible? */
+  public abstract void setVisible(boolean visible);
+  public abstract boolean getVisible();
+
+  /** Render this ManipPart now using the given OpenGL routines and
+      assuming an OpenGL context is current. */
+  public abstract void render(GL gl);
+}
diff --git a/src/gleem/ManipPartCube.java b/src/gleem/ManipPartCube.java
new file mode 100644
index 0000000..8e4a2f7
--- /dev/null
+++ b/src/gleem/ManipPartCube.java
@@ -0,0 +1,102 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem;
+
+import java.util.*;
+
+import gleem.linalg.*;
+
+/** A cube of width, height, and depth 2, centered about the origin
+    and aligned with the X, Y, and Z axes. */
+
+public class ManipPartCube extends ManipPartTriBased {
+  private static final Vec3f[] vertices = {
+    // Front side
+    new Vec3f(-1, 1, 1),
+    new Vec3f(-1, -1, 1),
+    new Vec3f(1, -1, 1),
+    new Vec3f(1, 1, 1),
+    // Back side
+    new Vec3f(-1, 1, -1),
+    new Vec3f(-1, -1, -1),
+    new Vec3f(1, -1, -1),
+    new Vec3f(1, 1, -1),
+  };
+
+  private static final int[] vertexIndices = {
+    // Front face
+    0, 1, 2,
+    0, 2, 3,
+    // Right face
+    3, 2, 6,
+    3, 6, 7,
+    // Back face
+    7, 6, 5,
+    7, 5, 4,
+    // Left face
+    4, 5, 1,
+    4, 1, 0,
+    // Top face
+    4, 0, 3,
+    4, 3, 7,
+    // Bottom face
+    1, 5, 6,
+    1, 6, 2
+  };
+
+  private static Vec3f[] normals  = null;
+  private static int[] normalIndices = null;
+
+  public ManipPartCube() {
+    super();
+
+    if (normals == null) {
+      NormalCalc.NormalInfo normInfo =
+        NormalCalc.computeFacetedNormals(vertices, vertexIndices, true);
+      normals = normInfo.normals;
+      normalIndices = normInfo.normalIndices;
+    }
+
+    setVertices(vertices);
+    setVertexIndices(vertexIndices);
+    setNormals(normals);
+    setNormalIndices(normalIndices);
+  }
+}
diff --git a/src/gleem/ManipPartGroup.java b/src/gleem/ManipPartGroup.java
new file mode 100644
index 0000000..859a8a3
--- /dev/null
+++ b/src/gleem/ManipPartGroup.java
@@ -0,0 +1,133 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem;
+
+import java.util.*;
+
+import gleem.linalg.*;
+import net.java.games.jogl.*;
+
+/** This class groups a set of ManipParts. Makes a set of ManipParts
+    look like one. */
+
+public class ManipPartGroup extends ManipPart {
+  private boolean pickable = true;
+  private boolean visible = true;
+  private List children = new ArrayList();
+
+  public void addChild(ManipPart child) {
+    children.add(child);
+  }
+
+  public void removeChild(ManipPart child) {
+    children.remove(child);
+  }
+
+  public int getNumChildren() {
+    return children.size();
+  }
+
+  public ManipPart getChild(int index) {
+    return (ManipPart) children.get(index);
+  }
+
+  public void intersectRay(Vec3f rayStart,
+                           Vec3f rayDirection,
+                           List results,
+                           Manip caller) {
+    if (!pickable) {
+      return;
+    }
+
+    int topIdx = results.size();
+    for (int i = 0; i < getNumChildren(); i++) {
+      getChild(i).intersectRay(rayStart, rayDirection, results, caller);
+    }
+
+    // Fix up all HitPoints so we appear to be the manipulator part
+    // which caused the intersection
+    for (int i = topIdx; i < results.size(); i++) {
+      ((HitPoint) results.get(i)).manipPart = this;
+    }
+  }
+
+  public void setTransform(Mat4f xform) {
+    for (int i = 0; i < getNumChildren(); i++) {
+      getChild(i).setTransform(xform);
+    }
+  }
+
+  public void highlight() {
+    for (int i = 0; i < getNumChildren(); i++) {
+      getChild(i).highlight();
+    }
+  }
+
+  public void clearHighlight() {
+    for (int i = 0; i < getNumChildren(); i++) {
+      getChild(i).clearHighlight();
+    }
+  }
+
+  public void setPickable(boolean pickable) {
+    this.pickable = pickable;
+  }
+
+  public boolean getPickable() {
+    return pickable;
+  }
+
+  public void setVisible(boolean visible) {
+    this.visible = visible;
+    for (Iterator iter = children.iterator(); iter.hasNext(); ) {
+      ((ManipPart) iter.next()).setVisible(visible);
+    }
+  }
+
+  public boolean getVisible() {
+    return visible;
+  }
+
+  public void render(GL gl) {
+    for (Iterator iter = children.iterator(); iter.hasNext(); ) {
+      ((ManipPart) iter.next()).render(gl);
+    }
+  }
+}
diff --git a/src/gleem/ManipPartLineSeg.java b/src/gleem/ManipPartLineSeg.java
new file mode 100644
index 0000000..8278533
--- /dev/null
+++ b/src/gleem/ManipPartLineSeg.java
@@ -0,0 +1,163 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem;
+
+import java.util.*;
+
+import gleem.linalg.*;
+import net.java.games.jogl.*;
+
+/** A line segment from (-1, 0, 0) to (1, 0, 0). */
+
+public class ManipPartLineSeg extends ManipPart {
+  private Vec3f color;
+  private Vec3f highlightColor;
+  private boolean highlighted;
+  private boolean visible;
+  private static Vec3f[] vertices = new Vec3f[] {
+    new Vec3f(-1, 0, 0),
+    new Vec3f(1, 0, 0)
+  };
+  /** Current transformation matrix */
+  private Mat4f xform;
+  /** Transformed vertices */
+  private Vec3f[] curVertices;
+
+  public ManipPartLineSeg() {
+    color          = new Vec3f(0.8f, 0.8f, 0.8f);
+    highlightColor = new Vec3f(0.8f, 0.8f, 0.2f);
+    highlighted    = false;
+    visible	   = true;
+    xform          = new Mat4f();
+    xform.makeIdent();
+    curVertices    = null;
+  }
+
+  /** Default color is (0.8, 0.8, 0.8) */
+  public void setColor(Vec3f color) {
+    this.color.set(color);
+  }
+
+  public Vec3f getColor() {
+    return new Vec3f(color);
+  }
+
+  /** Default highlight color is (0.8, 0.8, 0) */
+  public void setHighlightColor(Vec3f highlightColor) {
+    this.highlightColor.set(highlightColor);
+  }
+  
+  public Vec3f getHighlightColor() {
+    return new Vec3f(highlightColor);
+  }
+
+  public void intersectRay(Vec3f rayStart,
+			   Vec3f rayDirection,
+			   List results,
+			   Manip caller) {
+  }
+
+  public void setTransform(Mat4f xform) {
+    this.xform.set(xform);
+    recalcVertices();
+  }
+
+  public void highlight() {
+    highlighted = true;
+  }
+
+  public void clearHighlight() {
+    highlighted = false;
+  }
+
+  public void setPickable(boolean pickable) {
+  }
+
+  public boolean getPickable() {
+    return false;
+  }
+
+  /** Default is visible */
+  public void setVisible(boolean visible) {
+    this.visible = visible;
+  }
+
+  public boolean getVisible() {
+    return visible;
+  }
+
+  public void render(GL gl) {
+    if (!visible)
+      return;
+    // FIXME: probably too slow
+    boolean reenable = gl.glIsEnabled(GL.GL_LIGHTING);
+    gl.glDisable(GL.GL_LIGHTING);
+    gl.glBegin(GL.GL_LINES);
+    if (highlighted)
+      gl.glColor3f(highlightColor.x(), highlightColor.y(), highlightColor.z());
+    else
+      gl.glColor3f(color.x(), color.y(), color.z());
+    for (int i = 0; i < curVertices.length; i++) {
+      Vec3f v = curVertices[i];
+      gl.glVertex3f(v.x(), v.y(), v.z());
+    }
+    gl.glEnd();
+    if (reenable)
+      gl.glEnable(GL.GL_LIGHTING);
+  }
+
+  //----------------------------------------------------------------------
+  // Internals only below this point
+  //
+
+  private void recalcVertices() {
+    if ((curVertices == null) ||
+        (curVertices.length != vertices.length)) {
+      curVertices = new Vec3f[vertices.length];
+      for (int i = 0; i < vertices.length; i++) {
+        curVertices[i] = new Vec3f();
+      }
+    }
+
+    for (int i = 0; i < curVertices.length; i++) {
+      xform.xformPt(vertices[i], curVertices[i]);
+    }
+  }
+}
diff --git a/src/gleem/ManipPartSquare.java b/src/gleem/ManipPartSquare.java
new file mode 100644
index 0000000..e639904
--- /dev/null
+++ b/src/gleem/ManipPartSquare.java
@@ -0,0 +1,82 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem;
+
+import java.util.*;
+
+import gleem.linalg.*;
+
+/** A 2x2 square in the X-Y plane, centered about the origin, with the
+    normal pointing in the +Z direction. */
+
+public class ManipPartSquare extends ManipPartTriBased {
+  private static final Vec3f[] vertices = {
+    // Counter-clockwise, starting from upper left
+    new Vec3f(-1, 1, 0),
+    new Vec3f(-1, -1, 0),
+    new Vec3f(1, -1, 0),
+    new Vec3f(1, 1, 0)
+  };
+
+  private static final int[] vertexIndices = {
+    // Just the front face
+    0, 1, 2,
+    0, 2, 3,
+  };
+
+  private static Vec3f[] normals  = null;
+  private static int[] normalIndices = null;
+
+  public ManipPartSquare() {
+    super();
+
+    if (normals == null) {
+      NormalCalc.NormalInfo normInfo =
+        NormalCalc.computeFacetedNormals(vertices, vertexIndices, true);
+      normals = normInfo.normals;
+      normalIndices = normInfo.normalIndices;
+    }
+
+    setVertices(vertices);
+    setVertexIndices(vertexIndices);
+    setNormals(normals);
+    setNormalIndices(normalIndices);
+  }
+}
diff --git a/src/gleem/ManipPartTransform.java b/src/gleem/ManipPartTransform.java
new file mode 100644
index 0000000..61a9bc5
--- /dev/null
+++ b/src/gleem/ManipPartTransform.java
@@ -0,0 +1,72 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem;
+
+import java.util.*;
+
+import gleem.linalg.*;
+
+/** A Group which contains an offset transformation which is performed
+    before the one handed down in setTransform. */
+
+public class ManipPartTransform extends ManipPartGroup {
+  private Mat4f offsetTransform;
+
+  public ManipPartTransform() {
+    super();
+    offsetTransform = new Mat4f();
+    offsetTransform.makeIdent();
+  }
+
+  public void setTransform(Mat4f xform) {
+    Mat4f totalXform = xform.mul(offsetTransform);
+    for (int i = 0; i < getNumChildren(); i++) {
+      getChild(i).setTransform(totalXform);
+    }
+  }
+
+  public void setOffsetTransform(Mat4f offsetTransform) {
+    this.offsetTransform.set(offsetTransform);
+  }
+
+  public Mat4f getOffsetTransform() {
+    return offsetTransform;
+  }
+}
diff --git a/src/gleem/ManipPartTriBased.java b/src/gleem/ManipPartTriBased.java
new file mode 100644
index 0000000..97f8ae3
--- /dev/null
+++ b/src/gleem/ManipPartTriBased.java
@@ -0,0 +1,292 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem;
+
+import java.util.*;
+
+import gleem.linalg.*;
+import net.java.games.jogl.*;
+
+/** Triangle-based manipulator part. This is the base class for most
+    of the ManipParts that GLEEM uses internally. You can feel free to
+    subclass this if you want to replace geometry in the manipulators,
+    or re-derive from ManipPart. See ManipPartLineSeg for an example. */
+
+public class ManipPartTriBased extends ManipPart {
+  private Vec3f   color;
+  private Vec3f   highlightColor;
+  private boolean highlighted;
+  private boolean pickable;
+  private boolean visible;
+  /** Direct references down to subclass-specific data */
+  private Vec3f[] vertices;
+  private Vec3f[] normals;
+  private int[]   vertexIndices;
+  private int[]   normalIndices;
+  /** Current transformation matrix */
+  private Mat4f   xform;
+  /** Transformed vertices and normals */
+  private Vec3f[] curVertices;
+  private Vec3f[] curNormals;
+
+  public ManipPartTriBased() {
+    color          = new Vec3f(0.8f, 0.8f, 0.8f);
+    highlightColor = new Vec3f(0.8f, 0.8f, 0.2f);
+    highlighted    = false;
+    pickable       = true;
+    visible	   = true;
+    vertices	   = null;
+    normals        = null;
+    vertexIndices  = null;
+    normalIndices  = null;
+    xform          = new Mat4f();
+    xform.makeIdent();
+    curVertices    = null;
+  }
+
+  /** Default color is (0.8, 0.8, 0.8) */
+  public void setColor(Vec3f color) {
+    this.color.set(color);
+  }
+
+  public Vec3f getColor() {
+    return new Vec3f(color);
+  }
+
+  /** Default highlight color is (0.8, 0.8, 0) */
+  public void setHighlightColor(Vec3f highlightColor) {
+    this.highlightColor.set(highlightColor);
+  }
+  
+  public Vec3f getHighlightColor() {
+    return new Vec3f(highlightColor);
+  }
+
+  public void intersectRay(Vec3f rayStart,
+			   Vec3f rayDirection,
+			   List  results,
+			   Manip caller) {
+    consistencyCheck();
+    if (!pickable) {
+      return;
+    }
+
+    IntersectionPoint intPt = new IntersectionPoint();
+    HitPoint hitPt = new HitPoint();
+    hitPt.manipulator = caller;
+    hitPt.manipPart = this;
+    for (int i = 0; i < vertexIndices.length; i+=3) {
+      int i0 = vertexIndices[i];
+      int i1 = vertexIndices[i+1];
+      int i2 = vertexIndices[i+2];
+      if (RayTriangleIntersection.intersectRayWithTriangle(rayStart,
+							   rayDirection,
+							   curVertices[i0],
+							   curVertices[i1],
+							   curVertices[i2],
+							   intPt)
+	  == RayTriangleIntersection.INTERSECTION) {
+	// Check for intersections behind the ray
+	if (intPt.getT() >= 0) {
+	  hitPt.rayStart = rayStart;
+	  hitPt.rayDirection = rayDirection;
+	  hitPt.intPt = intPt;
+	  results.add(hitPt);
+	}
+      }
+    }
+  }
+
+  public void setTransform(Mat4f xform) {
+    this.xform.set(xform);
+    recalcVertices();
+  }
+
+  public void highlight() {
+    highlighted = true;
+  }
+
+  public void clearHighlight() {
+    highlighted = false;
+  }
+
+  /** Default is pickable */
+  public void setPickable(boolean pickable) {
+    this.pickable = pickable;    
+  }
+
+  public boolean getPickable() {
+    return pickable;
+  }
+
+  /** Default is visible */
+  public void setVisible(boolean visible) {
+    this.visible = visible;
+  }
+
+  public boolean getVisible() {
+    return visible;
+  }
+
+  public void render(GL gl) {
+    if (!visible)
+      return;
+    boolean lightingOn = true;
+    // FIXME: this is too expensive; figure out another way
+    //  if (glIsEnabled(GL.GL_LIGHTING))
+    //    lightingOn = true;
+
+    if (lightingOn) {
+      gl.glEnable(GL.GL_COLOR_MATERIAL);
+      gl.glColorMaterial(GL.GL_FRONT_AND_BACK, GL.GL_AMBIENT_AND_DIFFUSE);
+    }
+    gl.glBegin(GL.GL_TRIANGLES);
+    if (highlighted)
+      gl.glColor3f(highlightColor.x(), highlightColor.y(), highlightColor.z());
+    else
+      gl.glColor3f(color.x(), color.y(), color.z());
+    int i = 0;
+    while (i < vertexIndices.length) {
+      Vec3f n0 = curNormals[normalIndices[i]];
+      Vec3f v0 = curVertices[vertexIndices[i]];
+      gl.glNormal3f(n0.x(), n0.y(), n0.z());
+      gl.glVertex3f(v0.x(), v0.y(), v0.z());
+      i++;
+
+      Vec3f n1 = curNormals[normalIndices[i]];
+      Vec3f v1 = curVertices[vertexIndices[i]];
+      gl.glNormal3f(n1.x(), n1.y(), n1.z());
+      gl.glVertex3f(v1.x(), v1.y(), v1.z());
+      i++;
+
+      Vec3f n2 = curNormals[normalIndices[i]];
+      Vec3f v2 = curVertices[vertexIndices[i]];
+      gl.glNormal3f(n2.x(), n2.y(), n2.z());
+      gl.glVertex3f(v2.x(), v2.y(), v2.z());
+      i++;
+    }
+    gl.glEnd();
+    if (lightingOn)
+      gl.glDisable(GL.GL_COLOR_MATERIAL);
+  }
+
+  //----------------------------------------------------------------------
+  // Used by subclasses to set up vertex, normals, and vertex and
+  // normal indices.
+  //
+  
+  protected void setVertices(Vec3f[] vertices) {
+    this.vertices = vertices;
+  }
+
+  protected Vec3f[] getVertices() {
+    return vertices;
+  }
+
+  protected void setNormals(Vec3f[] normals) {
+    this.normals = normals;
+  }
+
+  protected Vec3f[] getNormals() {
+    return normals;
+  }
+
+  protected void setVertexIndices(int[] vertexIndices) {
+    this.vertexIndices = vertexIndices;
+  }
+
+  protected int[] getVertexIndices() {
+    return vertexIndices;
+  }
+
+  protected void setNormalIndices(int[] normalIndices) {
+    this.normalIndices = normalIndices;
+  }
+
+  protected int[] getNormalIndices() {
+    return normalIndices;
+  }
+
+  //----------------------------------------------------------------------
+  // Internals only below this point
+  //
+
+  private void consistencyCheck() {
+    if (vertexIndices.length != normalIndices.length) {
+      throw new RuntimeException("vertexIndices.length != normalIndices.length");
+    }
+    
+    if ((vertexIndices.length % 3) != 0) {
+      throw new RuntimeException("(vertexIndices % 3) != 0");
+    }
+    
+    if ((curVertices != null) &&
+        (vertices.length != curVertices.length)) {
+      throw new RuntimeException("vertices.length != curVertices.length");
+    }
+  }
+
+  private void recalcVertices() {
+    if ((curVertices == null) ||
+        (curVertices.length != vertices.length)) {
+      curVertices = new Vec3f[vertices.length];
+      for (int i = 0; i < vertices.length; i++) {
+        curVertices[i] = new Vec3f();
+      }
+    }
+
+    for (int i = 0; i < vertices.length; i++) {
+      xform.xformPt(vertices[i], curVertices[i]);
+    }
+
+    if ((curNormals == null) ||
+        (curNormals.length != normals.length)) {
+      curNormals = new Vec3f[normals.length];
+      for (int i = 0; i < normals.length; i++) {
+        curNormals[i] = new Vec3f();
+      }
+    }
+
+    for (int i = 0; i < normals.length; i++) {
+      xform.xformDir(normals[i], curNormals[i]);
+      curNormals[i].normalize();
+    }
+  }
+}
diff --git a/src/gleem/ManipPartTwoWayArrow.java b/src/gleem/ManipPartTwoWayArrow.java
new file mode 100644
index 0000000..77ba507
--- /dev/null
+++ b/src/gleem/ManipPartTwoWayArrow.java
@@ -0,0 +1,126 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem;
+
+import java.util.*;
+
+import gleem.linalg.*;
+
+/** Piece of geometry defining a two-way arrow, used in Translate1 and
+    Translate2 manips. */
+
+public class ManipPartTwoWayArrow extends ManipPartTriBased {
+  private static final Vec3f[] vertices = {
+    // Left tetrahedron
+    new Vec3f(-1.0f, 0.0f, 0.0f),
+    new Vec3f(-0.666666f, 0.166666f, 0.166666f),
+    new Vec3f(-0.666666f, -0.166666f, 0.166666f),
+    new Vec3f(-0.666666f, -0.166666f, -0.166666f),
+    new Vec3f(-0.666666f, 0.166666f, -0.166666f),
+
+    // Box at center
+    new Vec3f(-0.666666f, 0.041666f, 0.0416666f),
+    new Vec3f(-0.666666f, -0.041666f, 0.0416666f),
+    new Vec3f(-0.666666f, -0.041666f, -0.0416666f),
+    new Vec3f(-0.666666f, 0.041666f, -0.0416666f),
+    new Vec3f(0.666666f, 0.041666f, 0.0416666f),
+    new Vec3f(0.666666f, -0.041666f, 0.0416666f),
+    new Vec3f(0.666666f, -0.041666f, -0.0416666f),
+    new Vec3f(0.666666f, 0.041666f, -0.0416666f),
+
+    // Right tetrahedron
+    new Vec3f(0.666666f, 0.166666f, 0.166666f),
+    new Vec3f(0.666666f, 0.166666f, -0.166666f),
+    new Vec3f(0.666666f, -0.166666f, -0.166666f),
+    new Vec3f(0.666666f, -0.166666f, 0.166666f),
+    new Vec3f(1.0f, 0.0f, 0.0f),
+  };
+
+  private static final int[] vertexIndices = {
+    // Left tetrahedron
+    1, 0, 2,
+    2, 0, 3,
+    3, 0, 4,
+    4, 0, 1,
+    1, 2, 3,
+    1, 3, 4,
+
+    // Box
+    5, 7, 6,   // left face
+    5, 8, 7,
+    5, 6, 10,  // front face
+    5, 10, 9,
+    6, 7, 11,  // bottom face
+    6, 11, 10,
+    7, 8, 12,  // back face
+    7, 12, 11,
+    8, 5, 9,   // top face
+    8, 9, 12,
+    9, 10, 11, // right face
+    9, 11, 12,
+
+    // Right tetrahedron
+    13, 14, 15,
+    13, 15, 16,
+    17, 14, 13,
+    17, 15, 14,
+    17, 16, 15,
+    17, 13, 16
+  };
+
+  private static Vec3f[] normals  = null;
+  private static int[] normalIndices = null;
+
+  public ManipPartTwoWayArrow() {
+    super();
+
+    if (normals == null) {
+      NormalCalc.NormalInfo normInfo =
+        NormalCalc.computeFacetedNormals(vertices, vertexIndices, true);
+      normals = normInfo.normals;
+      normalIndices = normInfo.normalIndices;
+    }
+
+    setVertices(vertices);
+    setVertexIndices(vertexIndices);
+    setNormals(normals);
+    setNormalIndices(normalIndices);
+  }
+}
diff --git a/src/gleem/MouseButtonHelper.java b/src/gleem/MouseButtonHelper.java
new file mode 100644
index 0000000..f682c53
--- /dev/null
+++ b/src/gleem/MouseButtonHelper.java
@@ -0,0 +1,75 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem;
+
+import java.security.*;
+
+/** Helper class for figuring out how many mouse buttons are
+    available. (Does not seem to be a way of figuring this out with
+    the AWT.) */
+
+public class MouseButtonHelper {
+  /** Returns the number of buttons on the mouse device. This is only
+      a guess and the implementation may need to be extended to
+      support other operating systems (in particular, Mac OS). */
+  public static int numMouseButtons() {
+    String osName = null;
+    if (System.getSecurityManager() != null) {
+      osName = (String)
+        AccessController.doPrivileged(new PrivilegedAction() {
+            public Object run() {
+              return System.getProperty("os.name");
+            }
+          });
+    } else {
+      osName = System.getProperty("os.name");
+    }
+    return mouseButtonsForOS(osName);
+  }
+
+  private static int mouseButtonsForOS(String osName) {
+    if (osName.startsWith("Windows")) {
+      return 2;
+    } else {
+      // Assume X11 and a three-button mouse
+      return 3;
+    }
+  }
+}
diff --git a/src/gleem/NormalCalc.java b/src/gleem/NormalCalc.java
new file mode 100644
index 0000000..635bd78
--- /dev/null
+++ b/src/gleem/NormalCalc.java
@@ -0,0 +1,118 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem;
+
+import java.util.*;
+
+import gleem.linalg.*;
+
+/** Calculates normals for a set of polygons. */
+
+public class NormalCalc {
+
+  /** Set of normals computed using {@link gleem.NormalCalc}. */
+  public static class NormalInfo {
+    public Vec3f[] normals;
+    public int[]   normalIndices;
+
+    NormalInfo(Vec3f[] normals, int[] normalIndices) {
+      this.normals = normals;
+      this.normalIndices = normalIndices;
+    }
+  }
+
+  /** Returns null upon failure, or a set of Vec3fs and integers
+      which represent faceted (non-averaged) normals, but per-vertex.
+      Performs bounds checking on indices with respect to vertex list.
+      Index list must represent independent triangles; indices are
+      taken in groups of three. If index list doesn't represent
+      triangles or other error occurred then returns null. ccw flag
+      indicates whether triangles are specified counterclockwise when
+      viewed from top or not. */
+
+  public static NormalInfo computeFacetedNormals(Vec3f[] vertices,
+                                                 int[] indices,
+                                                 boolean ccw) {
+    if ((indices.length % 3) != 0) {
+      System.err.println("NormalCalc.computeFacetedNormals: numIndices wasn't " +
+                         "divisible by 3, so it can't possibly " +
+                         "represent a set of triangles");
+      return null;
+    }
+    
+    Vec3f[] outputNormals  = new Vec3f[indices.length / 3];
+    int[] outputNormalIndices = new int[indices.length];
+
+    Vec3f d1 = new Vec3f();
+    Vec3f d2 = new Vec3f();
+    int curNormalIndex = 0;
+    for (int i = 0; i < indices.length; i += 3) {
+      int i0 = indices[i];
+      int i1 = indices[i+1];
+      int i2 = indices[i+2];
+      if ((i0 < 0) || (i0 >= indices.length) ||
+	  (i1 < 0) || (i1 >= indices.length) ||
+	  (i2 < 0) || (i2 >= indices.length)) {
+	  System.err.println("NormalCalc.computeFacetedNormals: ERROR: " +
+                             "vertex index out of bounds or no end of triangle " +
+                             "index found");
+          return null;
+        }
+      Vec3f v0 = vertices[i0];
+      Vec3f v1 = vertices[i1];
+      Vec3f v2 = vertices[i2];
+      d1.sub(v1, v0);
+      d2.sub(v2, v0);
+      Vec3f n = new Vec3f();
+      if (ccw) {
+        n.cross(d1, d2);
+      } else {
+        n.cross(d2, d1);
+      }
+      n.normalize();
+      outputNormals[curNormalIndex] = n;
+      outputNormalIndices[i] = curNormalIndex;
+      outputNormalIndices[i+1] = curNormalIndex;
+      outputNormalIndices[i+2] = curNormalIndex;
+      curNormalIndex++;
+    }
+    return new NormalInfo(outputNormals, outputNormalIndices);
+  }
+}
diff --git a/src/gleem/RayTriangleIntersection.java b/src/gleem/RayTriangleIntersection.java
new file mode 100644
index 0000000..8b3417d
--- /dev/null
+++ b/src/gleem/RayTriangleIntersection.java
@@ -0,0 +1,226 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem;
+
+import gleem.linalg.*;
+
+/** Implements ray casting against a 3D triangle. */
+
+public class RayTriangleIntersection {
+  public static final int ERROR           = 0;
+  public static final int NO_INTERSECTION = 1;
+  public static final int INTERSECTION    = 2;
+
+  /** Allow roundoff error of this amount. Be very careful adjusting
+      this. Too big a value may cause valid triangles to be rejected.
+      Too small a value may trigger an assert in the code to create an
+      orthonormal basis in intersectRayWithTriangle. */
+  private static final float epsilon = 1.0e-3f;
+
+  /** Cast a ray starting at rayOrigin with rayDirection into the
+      triangle defined by vertices v0, v1, and v2. If intersection
+      occurred returns INTERSECTION and sets intersectionPoint
+      appropriately, including t parameter (scale factor for
+      rayDirection to reach intersection plane starting from
+      rayOrigin). Returns NO_INTERSECTION if no intersection, or ERROR
+      if triangle was degenerate or line was parallel to plane of
+      triangle. */
+  public static int intersectRayWithTriangle(Vec3f rayOrigin,
+					     Vec3f rayDirection,
+					     Vec3f v0,
+					     Vec3f v1,
+					     Vec3f v2,
+					     IntersectionPoint intersectionPoint) {
+    // Returns INTERSECTION if intersection computed, NO_INTERSECTION
+    // if no intersection with triangle, ERROR if triangle was
+    // degenerate or line did not intersect plane containing triangle.
+
+    // NOTE these rays are TWO-SIDED.
+
+    // Find point on line. P = ray origin, D = ray direction.
+    //   P + tD = W
+    // Find point on plane. X, Y = orthonormal bases for plane; O = its origin.
+    //   O + uX + vY = W
+    // Set equal
+    //   O + uX + vY = tD + P
+    //   uX + vY - tD = P - O = "B"
+    //   [X0 Y0 -D0] [u]   [B0]
+    //   [X1 Y1 -D1] [v] = [B1]
+    //   [X2 Y2 -D2] [t]   [B2]
+    // Now we have u, v coordinates for the intersection point (if system
+    // wasn't degenerate).
+    // Find u, v coordinates for three points of triangle. (DON'T DUPLICATE
+    // WORK.) Now easy to do 2D inside/outside test.
+    // If point is inside, do some sort of interpolation to compute the
+    // 3D coordinates of the intersection point (may be unnecessary --
+    // can reuse X, Y bases from above) and texture coordinates of this
+    // point (maybe compute "texture coordinate" bases using same algorithm
+    // and just use u, v coordinates??).
+
+    Vec3f O = new Vec3f(v0);
+    Vec3f p2 = new Vec3f();
+    p2.sub(v1, O);
+    Vec3f p3 = new Vec3f();
+    p3.sub(v2, O);
+
+    Vec3f X = new Vec3f(p2);
+    Vec3f Y = new Vec3f(p3);
+  
+    // Normalize X
+    if (X.length() < epsilon)
+      return ERROR;  // coincident points in triangle
+    X.normalize();
+
+    // Use Gramm-Schmitt to orthogonalize X and Y
+    Vec3f tmp = new Vec3f(X);
+    tmp.scale(X.dot(Y));
+    Y.sub(tmp);
+    if (Y.length() < epsilon) {
+      return ERROR;  // coincident points in triangle
+    }
+    Y.normalize();
+
+    // X and Y are now orthonormal bases for the plane defined by the
+    // triangle.
+
+    Vec3f Bv = new Vec3f();
+    Bv.sub(rayOrigin, O);
+
+    Mat3f A = new Mat3f();
+    A.setCol(0, X);
+    A.setCol(1, Y);
+    Vec3f tmpRayDir = new Vec3f(rayDirection);
+    tmpRayDir.scale(-1.0f);
+    A.setCol(2, tmpRayDir);
+    if (!A.invert()) {
+      return ERROR;
+    }
+    Vec3f B = new Vec3f();
+    A.xformVec(Bv, B);
+
+    Vec2f W = new Vec2f(B.x(), B.y());
+
+    // Compute u,v coords of triangle
+    Vec2f[] uv = new Vec2f[3];
+    uv[0]      = new Vec2f(0,0);
+    uv[1]      = new Vec2f(p2.dot(X), p2.dot(Y));
+    uv[2]      = new Vec2f(p3.dot(X), p3.dot(Y));
+
+    if (!(Math.abs(uv[1].y()) < epsilon)) {
+      throw new RuntimeException("Math.abs(uv[1].y()) >= epsilon");
+    }
+
+    // Test. For each of the sides of the triangle, is the intersection
+    // point on the same side as the third vertex of the triangle?
+    // If so, intersection point is inside triangle.
+    for (int i = 0; i < 3; i++) {
+      if (approxOnSameSide(uv[i], uv[(i+1)%3],
+			   uv[(i+2)%3], W) == false) {
+	return NO_INTERSECTION;
+      }
+    }
+
+    // Blend coordinates and texture coordinates according to
+    // distances from 3 points
+    // To do: find u,v coordinates of intersection point in coordinate
+    // system of axes defined by uv[1] and uv[2].
+    // Blending coords == a, b. 0 <= a,b <= 1.
+    if (!(Math.abs(uv[2].y()) > epsilon)) {
+      throw new RuntimeException("Math.abs(uv[2].y()) <= epsilon");
+    }
+    if (!(Math.abs(uv[1].x()) > epsilon)) {
+      throw new RuntimeException("Math.abs(uv[1].x()) <= epsilon");
+    }
+    float a, b;
+    b = W.y() / uv[2].y();
+    a = (W.x() - b * uv[2].x()) / uv[1].x();
+
+    p2.scale(a);
+    p3.scale(b);
+    O.add(p2);
+    O.add(p3);
+    intersectionPoint.setIntersectionPoint(O);
+    intersectionPoint.setT(B.z());
+    return INTERSECTION;
+  }
+
+  private static boolean approxOnSameSide(Vec2f linePt1, Vec2f linePt2,
+					  Vec2f testPt1, Vec2f testPt2) {
+    // Evaluate line equation for testPt1 and testPt2
+
+    // ((y2 - y1) / (x2 - x1)) - ((y1 - y) / (x1 - x))
+    // y - (mx + b)
+    float num0 = linePt2.y() - linePt1.y();
+    float den0 = linePt2.x() - linePt1.x();
+    float num1 = linePt1.y() - testPt1.y();
+    float den1 = linePt1.x() - testPt1.x();
+    float num2 = linePt1.y() - testPt2.y();
+    float den2 = linePt1.x() - testPt2.x();
+
+    if (Math.abs(den0) < epsilon) {
+      // line goes vertically.
+      if ((Math.abs(den1) < epsilon) ||
+	  (Math.abs(den2) < epsilon)) {
+	return true;
+      }
+      
+      if (MathUtil.sgn(den1) == MathUtil.sgn(den2)) {
+	return true;
+      }
+      
+      return false;
+    }
+
+    float m = num0 / den0;
+    // (y - y1) - m(x - x1)
+    float val1 = testPt1.y() - linePt1.y() - m * (testPt1.x() - linePt1.x());
+    float val2 = testPt2.y() - linePt1.y() - m * (testPt2.x() - linePt1.x());
+    if ((Math.abs(val1) < epsilon) ||
+	(Math.abs(val2) < epsilon)) {
+      return true;
+    }
+
+    if (MathUtil.sgn(val1) == MathUtil.sgn(val2)) {
+      return true;
+    }
+
+    return false;
+  }
+}
diff --git a/src/gleem/RightTruncPyrMapping.java b/src/gleem/RightTruncPyrMapping.java
new file mode 100644
index 0000000..d25c17a
--- /dev/null
+++ b/src/gleem/RightTruncPyrMapping.java
@@ -0,0 +1,64 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem;
+
+import gleem.linalg.*;
+
+/** The only mapping gleem supports right now -- a right truncated
+    pyramid. */
+
+public class RightTruncPyrMapping implements ScreenToRayMapping {
+  public void mapScreenToRay(Vec2f screenCoords,
+                             CameraParameters params,
+                             Vec3f raySource,
+                             Vec3f rayDirection) { 
+    Vec3f fwd   = new Vec3f(params.getForwardDirection());
+    Vec3f up    = new Vec3f(params.getUpDirection());
+    Vec3f right = fwd.cross(up);
+    fwd.normalize();
+    up.normalize();
+    right.normalize();
+    float horizFOV = (float) Math.atan(params.imagePlaneAspectRatio * Math.tan(params.vertFOV));
+    right.scale((float) (Math.tan(horizFOV)       * screenCoords.get(0)));
+    up   .scale((float) (Math.tan(params.vertFOV) * screenCoords.get(1)));
+    raySource.set(params.getPosition());
+    rayDirection.set(fwd.plus(up).plus(right));
+  }
+}
diff --git a/src/gleem/ScreenToRayMapping.java b/src/gleem/ScreenToRayMapping.java
new file mode 100644
index 0000000..f77da8b
--- /dev/null
+++ b/src/gleem/ScreenToRayMapping.java
@@ -0,0 +1,73 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem;
+
+import gleem.linalg.*;
+
+/** <P> This interface defines the mapping from normalized screen
+    coordinates to a 3D ray based on the given camera parameters. You
+    could subclass it to allow for more types of camera frusta, but
+    would also have to modify the CameraParameters structure. </P>
+
+    <P> The "normalized" screen coordinates must have the following
+    properties: </P>
+    
+    <P>
+    upper left corner = (-1, 1) <BR>
+    lower left corner = (-1, -1) <BR>
+    lower right corner = (1, -1) <BR>
+    upper right corner = (1, 1) <BR>
+    center = (0, 0)
+    </P>
+
+    <P> The application is responsible for specifying the window size
+    to allow the ManipManager to compute these coordinates. </P>
+*/
+
+public interface ScreenToRayMapping {
+  /** Maps screen (x, y) to 3D point source and direction based on
+      given CameraParameters. screenCoords and params are incoming
+      arguments; raySource and rayDirection are mutated to contain the
+      result. */
+  public void mapScreenToRay(Vec2f screenCoords,
+                             CameraParameters params,
+                             Vec3f raySource,
+                             Vec3f rayDirection);
+}
diff --git a/src/gleem/TestExaminerViewer.java b/src/gleem/TestExaminerViewer.java
new file mode 100644
index 0000000..55d0283
--- /dev/null
+++ b/src/gleem/TestExaminerViewer.java
@@ -0,0 +1,153 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem;
+
+import java.awt.*;
+import java.awt.event.*;
+import net.java.games.jogl.*;
+import gleem.linalg.*;
+
+/** Tests the Examiner Viewer. */
+
+public class TestExaminerViewer {
+  private static final int X_SIZE = 400;
+  private static final int Y_SIZE = 400;
+
+  static class HandleBoxManipBSphereProvider implements BSphereProvider {
+    private HandleBoxManip manip;
+
+    private HandleBoxManipBSphereProvider(HandleBoxManip manip) {
+      this.manip = manip;
+    }
+
+    public BSphere getBoundingSphere() {
+      BSphere bsph = new BSphere();
+      bsph.setCenter(manip.getTranslation());
+      Vec3f scale0 = manip.getScale();
+      Vec3f scale1 = manip.getGeometryScale();
+      Vec3f scale = new Vec3f();
+      scale.setX(2.0f * scale0.x() * scale1.x());
+      scale.setY(2.0f * scale0.y() * scale1.y());
+      scale.setZ(2.0f * scale0.z() * scale1.z());
+      bsph.setRadius(scale.length());
+      return bsph;
+    }
+  }
+
+  static class Listener implements GLEventListener {
+    private GL gl;
+    private GLU glu;
+    private CameraParameters params = new CameraParameters();
+    private ExaminerViewer viewer;
+
+    public void init(GLDrawable drawable) {
+      gl = drawable.getGL();
+      glu = drawable.getGLU();
+
+      gl.glClearColor(0, 0, 0, 0);
+      float[] lightPosition = new float[] {1, 1, 1, 0};
+      float[] ambient       = new float[] { 0.0f, 0.0f, 0.0f, 1.0f };
+      float[] diffuse       = new float[] { 1.0f, 1.0f, 1.0f, 1.0f };
+      gl.glLightfv(GL.GL_LIGHT0, GL.GL_AMBIENT,  ambient);
+      gl.glLightfv(GL.GL_LIGHT0, GL.GL_DIFFUSE,  diffuse);
+      gl.glLightfv(GL.GL_LIGHT0, GL.GL_POSITION, lightPosition);
+
+      gl.glEnable(GL.GL_LIGHTING);
+      gl.glEnable(GL.GL_LIGHT0);
+      gl.glEnable(GL.GL_DEPTH_TEST);
+
+      params.setPosition(new Vec3f(0, 0, 0));
+      params.setForwardDirection(Vec3f.NEG_Z_AXIS);
+      params.setUpDirection(Vec3f.Y_AXIS);
+      params.setVertFOV((float) (Math.PI / 8.0));
+      params.setImagePlaneAspectRatio(1);
+      params.xSize = X_SIZE;
+      params.ySize = Y_SIZE;
+
+      gl.glMatrixMode(GL.GL_PROJECTION);
+      gl.glLoadIdentity();
+      glu.gluPerspective(45, 1, 1, 100);
+      gl.glMatrixMode(GL.GL_MODELVIEW);
+      gl.glLoadIdentity();
+
+      // Register the window with the ManipManager
+      ManipManager manager = ManipManager.getManipManager();
+      manager.registerWindow(drawable);
+
+      // Instantiate a HandleBoxManip
+      HandleBoxManip manip = new HandleBoxManip();
+      manip.setTranslation(new Vec3f(0, 0, -10));
+      manager.showManipInWindow(manip, drawable);
+
+      // Instantiate ExaminerViewer
+      viewer = new ExaminerViewer(MouseButtonHelper.numMouseButtons());
+      viewer.attach(drawable, new HandleBoxManipBSphereProvider(manip));
+      viewer.viewAll(gl);
+    }
+
+    public void display(GLDrawable drawable) {
+      gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
+      viewer.update(gl);
+      ManipManager.getManipManager().updateCameraParameters(drawable, viewer.getCameraParameters());
+      ManipManager.getManipManager().render(drawable, gl);
+    }
+
+    // Unused routines
+    public void reshape(GLDrawable drawable, int x, int y, int w, int h) {}
+    public void displayChanged(GLDrawable drawable, boolean modeChanged, boolean deviceChanged) {}
+  }
+
+  public static void main(String[] args) {
+    Frame frame = new Frame("ExaminerViewer Test");
+    frame.addWindowListener(new WindowAdapter() {
+        public void windowClosing(WindowEvent e) {
+          System.exit(0);
+        }
+      });
+    frame.setLayout(new BorderLayout());
+    GLCanvas canvas =
+      GLDrawableFactory.getFactory().createGLCanvas(new GLCapabilities());
+    canvas.setSize(400, 400);
+    canvas.addGLEventListener(new Listener());
+    frame.add(canvas, BorderLayout.CENTER);
+    frame.pack();
+    frame.show();
+  }
+}
diff --git a/src/gleem/TestHandleBox.java b/src/gleem/TestHandleBox.java
new file mode 100644
index 0000000..adf8e32
--- /dev/null
+++ b/src/gleem/TestHandleBox.java
@@ -0,0 +1,142 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem;
+
+import java.awt.*;
+import java.awt.event.*;
+import net.java.games.jogl.*;
+import gleem.linalg.*;
+
+/** Tests the HandleBox Manip. */
+
+public class TestHandleBox {
+  private static final int X_SIZE = 400;
+  private static final int Y_SIZE = 400;
+
+  static class Listener implements GLEventListener {
+    private GL gl;
+    private GLU glu;
+    private CameraParameters params = new CameraParameters();
+
+    public void init(GLDrawable drawable) {
+      gl = drawable.getGL();
+      glu = drawable.getGLU();
+
+      gl.glClearColor(0, 0, 0, 0);
+      float[] lightPosition = new float[] {1, 1, 1, 0};
+      float[] ambient       = new float[] { 0.0f, 0.0f, 0.0f, 1.0f };
+      float[] diffuse       = new float[] { 1.0f, 1.0f, 1.0f, 1.0f };
+      gl.glLightfv(GL.GL_LIGHT0, GL.GL_AMBIENT,  ambient);
+      gl.glLightfv(GL.GL_LIGHT0, GL.GL_DIFFUSE,  diffuse);
+      gl.glLightfv(GL.GL_LIGHT0, GL.GL_POSITION, lightPosition);
+
+      gl.glEnable(GL.GL_LIGHTING);
+      gl.glEnable(GL.GL_LIGHT0);
+      gl.glEnable(GL.GL_DEPTH_TEST);
+
+      params.setPosition(new Vec3f(0, 0, 0));
+      params.setForwardDirection(Vec3f.NEG_Z_AXIS);
+      params.setUpDirection(Vec3f.Y_AXIS);
+      params.setVertFOV((float) (Math.PI / 8.0));
+      params.setImagePlaneAspectRatio(1);
+      params.xSize = X_SIZE;
+      params.ySize = Y_SIZE;
+
+      gl.glMatrixMode(GL.GL_PROJECTION);
+      gl.glLoadIdentity();
+      glu.gluPerspective(45, 1, 1, 100);
+      gl.glMatrixMode(GL.GL_MODELVIEW);
+      gl.glLoadIdentity();
+
+      // Register the window with the ManipManager
+      ManipManager manager = ManipManager.getManipManager();
+      manager.registerWindow(drawable);
+
+      // Instantiate a HandleBoxManip
+      HandleBoxManip manip = new HandleBoxManip();
+      manip.setTranslation(new Vec3f(0, 0, -10));
+      manager.showManipInWindow(manip, drawable);
+    }
+
+    public void display(GLDrawable drawable) {
+      gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
+      ManipManager.getManipManager().updateCameraParameters(drawable, params);
+      ManipManager.getManipManager().render(drawable, gl);
+    }
+
+    public void reshape(GLDrawable drawable, int x, int y, int w, int h) {
+      float aspect, theta;
+      aspect = (float) w / (float) h;
+      if (w >= h)
+        theta = 45;
+      else
+        theta = (float) Math.toDegrees(Math.atan(1 / aspect));
+      params.setVertFOV((float) Math.toRadians(theta) / 2.0f);
+      params.setImagePlaneAspectRatio(aspect);
+      params.setXSize(w);
+      params.setYSize(h);
+      gl.glMatrixMode(GL.GL_PROJECTION);
+      gl.glLoadIdentity();
+      glu.gluPerspective(theta, aspect, 1, 100);
+      gl.glMatrixMode(GL.GL_MODELVIEW);
+      gl.glLoadIdentity();
+    }
+
+    // Unused routines
+    public void displayChanged(GLDrawable drawable, boolean modeChanged, boolean deviceChanged) {}
+  }
+
+  public static void main(String[] args) {
+    Frame frame = new Frame("HandleBox Test");
+    frame.addWindowListener(new WindowAdapter() {
+        public void windowClosing(WindowEvent e) {
+          System.exit(0);
+        }
+      });
+    frame.setLayout(new BorderLayout());
+    GLCanvas canvas =
+      GLDrawableFactory.getFactory().createGLCanvas(new GLCapabilities());
+    canvas.setSize(400, 400);
+    canvas.addGLEventListener(new Listener());
+    frame.add(canvas, BorderLayout.CENTER);
+    frame.pack();
+    frame.show();
+  }
+}
diff --git a/src/gleem/TestMultiWin.java b/src/gleem/TestMultiWin.java
new file mode 100644
index 0000000..ce2c257
--- /dev/null
+++ b/src/gleem/TestMultiWin.java
@@ -0,0 +1,162 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem;
+
+import java.awt.*;
+import java.awt.event.*;
+import net.java.games.jogl.*;
+import gleem.linalg.*;
+
+/** Tests viewing manipulators in multiple winodws. */
+
+public class TestMultiWin {
+  private static final int X_SIZE = 400;
+  private static final int Y_SIZE = 400;
+
+  private static HandleBoxManip manip;
+
+  static class HandleBoxManipBSphereProvider implements BSphereProvider {
+    private HandleBoxManip manip;
+
+    private HandleBoxManipBSphereProvider(HandleBoxManip manip) {
+      this.manip = manip;
+    }
+
+    public BSphere getBoundingSphere() {
+      BSphere bsph = new BSphere();
+      bsph.setCenter(manip.getTranslation());
+      Vec3f scale0 = manip.getScale();
+      Vec3f scale1 = manip.getGeometryScale();
+      Vec3f scale = new Vec3f();
+      scale.setX(2.0f * scale0.x() * scale1.x());
+      scale.setY(2.0f * scale0.y() * scale1.y());
+      scale.setZ(2.0f * scale0.z() * scale1.z());
+      bsph.setRadius(scale.length());
+      return bsph;
+    }
+  }
+
+  static class Listener implements GLEventListener {
+    private GL gl;
+    private GLU glu;
+    private CameraParameters params = new CameraParameters();
+    private ExaminerViewer viewer;
+
+    public void init(GLDrawable drawable) {
+      gl = drawable.getGL();
+      glu = drawable.getGLU();
+
+      gl.glClearColor(0, 0, 0, 0);
+      float[] lightPosition = new float[] {1, 1, 1, 0};
+      float[] ambient       = new float[] { 0.0f, 0.0f, 0.0f, 1.0f };
+      float[] diffuse       = new float[] { 1.0f, 1.0f, 1.0f, 1.0f };
+      gl.glLightfv(GL.GL_LIGHT0, GL.GL_AMBIENT,  ambient);
+      gl.glLightfv(GL.GL_LIGHT0, GL.GL_DIFFUSE,  diffuse);
+      gl.glLightfv(GL.GL_LIGHT0, GL.GL_POSITION, lightPosition);
+
+      gl.glEnable(GL.GL_LIGHTING);
+      gl.glEnable(GL.GL_LIGHT0);
+      gl.glEnable(GL.GL_DEPTH_TEST);
+
+      params.setPosition(new Vec3f(0, 0, 0));
+      params.setForwardDirection(Vec3f.NEG_Z_AXIS);
+      params.setUpDirection(Vec3f.Y_AXIS);
+      params.setVertFOV((float) (Math.PI / 8.0));
+      params.setImagePlaneAspectRatio(1);
+      params.xSize = X_SIZE;
+      params.ySize = Y_SIZE;
+
+      gl.glMatrixMode(GL.GL_PROJECTION);
+      gl.glLoadIdentity();
+      glu.gluPerspective(45, 1, 1, 100);
+      gl.glMatrixMode(GL.GL_MODELVIEW);
+      gl.glLoadIdentity();
+
+      // Register the window with the ManipManager
+      ManipManager manager = ManipManager.getManipManager();
+      manager.registerWindow(drawable);
+
+      manager.showManipInWindow(manip, drawable);
+
+      // Instantiate ExaminerViewer
+      viewer = new ExaminerViewer(MouseButtonHelper.numMouseButtons());
+      viewer.attach(drawable, new HandleBoxManipBSphereProvider(manip));
+      viewer.viewAll(gl);
+    }
+
+    public void display(GLDrawable drawable) {
+      gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
+      viewer.update(gl);
+      ManipManager.getManipManager().updateCameraParameters(drawable, viewer.getCameraParameters());
+      ManipManager.getManipManager().render(drawable, gl);
+    }
+
+    // Unused routines
+    public void reshape(GLDrawable drawable, int x, int y, int w, int h) {}
+    public void displayChanged(GLDrawable drawable, boolean modeChanged, boolean deviceChanged) {}
+  }
+
+  private static void showFrame(String name, Point location) {
+    Frame frame = new Frame(name);
+    frame.addWindowListener(new WindowAdapter() {
+        public void windowClosing(WindowEvent e) {
+          System.exit(0);
+        }
+      });
+    frame.setLayout(new BorderLayout());
+    GLCanvas canvas =
+      GLDrawableFactory.getFactory().createGLCanvas(new GLCapabilities());
+    canvas.setSize(400, 400);
+    canvas.addGLEventListener(new Listener());
+    frame.add(canvas, BorderLayout.CENTER);
+    frame.pack();
+    frame.setLocation(location);
+    frame.show();
+  }
+
+  public static void main(String[] args) {
+    // Instantiate HandleBoxManip
+    manip = new HandleBoxManip();
+    manip.setTranslation(new Vec3f(0, 0, -10));
+
+    showFrame("MultiWin Test 1/2", new Point(0, 0));
+    showFrame("MultiWin Test 2/2", new Point(400, 0));
+  }
+}
diff --git a/src/gleem/TestTranslate1.java b/src/gleem/TestTranslate1.java
new file mode 100644
index 0000000..131fa0c
--- /dev/null
+++ b/src/gleem/TestTranslate1.java
@@ -0,0 +1,143 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem;
+
+import java.awt.*;
+import java.awt.event.*;
+import net.java.games.jogl.*;
+import gleem.linalg.*;
+
+/** Tests the Translate1 Manip. */
+
+public class TestTranslate1 {
+  private static final int X_SIZE = 400;
+  private static final int Y_SIZE = 400;
+
+  static class Listener implements GLEventListener {
+    private GL gl;
+    private GLU glu;
+    private CameraParameters params = new CameraParameters();
+
+    public void init(GLDrawable drawable) {
+      gl = drawable.getGL();
+      glu = drawable.getGLU();
+
+      gl.glClearColor(0, 0, 0, 0);
+      float[] lightPosition = new float[] {1, 1, 1, 0};
+      float[] ambient       = new float[] { 0.0f, 0.0f, 0.0f, 1.0f };
+      float[] diffuse       = new float[] { 1.0f, 1.0f, 1.0f, 1.0f };
+      gl.glLightfv(GL.GL_LIGHT0, GL.GL_AMBIENT,  ambient);
+      gl.glLightfv(GL.GL_LIGHT0, GL.GL_DIFFUSE,  diffuse);
+      gl.glLightfv(GL.GL_LIGHT0, GL.GL_POSITION, lightPosition);
+
+      gl.glEnable(GL.GL_LIGHTING);
+      gl.glEnable(GL.GL_LIGHT0);
+      gl.glEnable(GL.GL_DEPTH_TEST);
+
+      params.setPosition(new Vec3f(0, 0, 0));
+      params.setForwardDirection(Vec3f.NEG_Z_AXIS);
+      params.setUpDirection(Vec3f.Y_AXIS);
+      params.setVertFOV((float) (Math.PI / 8.0));
+      params.setImagePlaneAspectRatio(1);
+      params.xSize = X_SIZE;
+      params.ySize = Y_SIZE;
+
+      gl.glMatrixMode(GL.GL_PROJECTION);
+      gl.glLoadIdentity();
+      glu.gluPerspective(45, 1, 1, 100);
+      gl.glMatrixMode(GL.GL_MODELVIEW);
+      gl.glLoadIdentity();
+
+      // Register the window with the ManipManager
+      ManipManager manager = ManipManager.getManipManager();
+      manager.registerWindow(drawable);
+
+      // Instantiate a Translate1Manip
+      Translate1Manip manip = new Translate1Manip();
+      manip.setTranslation(new Vec3f(0, 0, -5));
+      manip.setAxis(new Vec3f(-1, 0.5f, 1));
+      manager.showManipInWindow(manip, drawable);
+    }
+
+    public void display(GLDrawable drawable) {
+      gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
+      ManipManager.getManipManager().updateCameraParameters(drawable, params);
+      ManipManager.getManipManager().render(drawable, gl);
+    }
+
+    public void reshape(GLDrawable drawable, int x, int y, int w, int h) {
+      float aspect, theta;
+      aspect = (float) w / (float) h;
+      if (w >= h)
+        theta = 45;
+      else
+        theta = (float) Math.toDegrees(Math.atan(1 / aspect));
+      params.setVertFOV((float) Math.toRadians(theta) / 2.0f);
+      params.setImagePlaneAspectRatio(aspect);
+      params.setXSize(w);
+      params.setYSize(h);
+      gl.glMatrixMode(GL.GL_PROJECTION);
+      gl.glLoadIdentity();
+      glu.gluPerspective(theta, aspect, 1, 100);
+      gl.glMatrixMode(GL.GL_MODELVIEW);
+      gl.glLoadIdentity();
+    }
+
+    // Unused routines
+    public void displayChanged(GLDrawable drawable, boolean modeChanged, boolean deviceChanged) {}
+  }
+
+  public static void main(String[] args) {
+    Frame frame = new Frame("Translate1 Test");
+    frame.addWindowListener(new WindowAdapter() {
+        public void windowClosing(WindowEvent e) {
+          System.exit(0);
+        }
+      });
+    frame.setLayout(new BorderLayout());
+    GLCanvas canvas =
+      GLDrawableFactory.getFactory().createGLCanvas(new GLCapabilities());
+    canvas.setSize(400, 400);
+    canvas.addGLEventListener(new Listener());
+    frame.add(canvas, BorderLayout.CENTER);
+    frame.pack();
+    frame.show();
+  }
+}
diff --git a/src/gleem/TestTranslate2.java b/src/gleem/TestTranslate2.java
new file mode 100644
index 0000000..1789575
--- /dev/null
+++ b/src/gleem/TestTranslate2.java
@@ -0,0 +1,143 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem;
+
+import java.awt.*;
+import java.awt.event.*;
+import net.java.games.jogl.*;
+import gleem.linalg.*;
+
+/** Tests the Translate2 Manip. */
+
+public class TestTranslate2 {
+  private static final int X_SIZE = 400;
+  private static final int Y_SIZE = 400;
+
+  static class Listener implements GLEventListener {
+    private GL gl;
+    private GLU glu;
+    private CameraParameters params = new CameraParameters();
+
+    public void init(GLDrawable drawable) {
+      gl = drawable.getGL();
+      glu = drawable.getGLU();
+
+      gl.glClearColor(0, 0, 0, 0);
+      float[] lightPosition = new float[] {1, 1, 1, 0};
+      float[] ambient       = new float[] { 0.0f, 0.0f, 0.0f, 1.0f };
+      float[] diffuse       = new float[] { 1.0f, 1.0f, 1.0f, 1.0f };
+      gl.glLightfv(GL.GL_LIGHT0, GL.GL_AMBIENT,  ambient);
+      gl.glLightfv(GL.GL_LIGHT0, GL.GL_DIFFUSE,  diffuse);
+      gl.glLightfv(GL.GL_LIGHT0, GL.GL_POSITION, lightPosition);
+
+      gl.glEnable(GL.GL_LIGHTING);
+      gl.glEnable(GL.GL_LIGHT0);
+      gl.glEnable(GL.GL_DEPTH_TEST);
+
+      params.setPosition(new Vec3f(0, 0, 0));
+      params.setForwardDirection(Vec3f.NEG_Z_AXIS);
+      params.setUpDirection(Vec3f.Y_AXIS);
+      params.setVertFOV((float) (Math.PI / 8.0));
+      params.setImagePlaneAspectRatio(1);
+      params.xSize = X_SIZE;
+      params.ySize = Y_SIZE;
+
+      gl.glMatrixMode(GL.GL_PROJECTION);
+      gl.glLoadIdentity();
+      glu.gluPerspective(45, 1, 1, 100);
+      gl.glMatrixMode(GL.GL_MODELVIEW);
+      gl.glLoadIdentity();
+
+      // Register the window with the ManipManager
+      ManipManager manager = ManipManager.getManipManager();
+      manager.registerWindow(drawable);
+
+      // Instantiate a Translate2Manip
+      Translate2Manip manip = new Translate2Manip();
+      manip.setTranslation(new Vec3f(0, 0, -5));
+      manip.setNormal(new Vec3f(-1, 1, 1));
+      manager.showManipInWindow(manip, drawable);
+    }
+
+    public void display(GLDrawable drawable) {
+      gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
+      ManipManager.getManipManager().updateCameraParameters(drawable, params);
+      ManipManager.getManipManager().render(drawable, gl);
+    }
+
+    public void reshape(GLDrawable drawable, int x, int y, int w, int h) {
+      float aspect, theta;
+      aspect = (float) w / (float) h;
+      if (w >= h)
+        theta = 45;
+      else
+        theta = (float) Math.toDegrees(Math.atan(1 / aspect));
+      params.setVertFOV((float) Math.toRadians(theta) / 2.0f);
+      params.setImagePlaneAspectRatio(aspect);
+      params.setXSize(w);
+      params.setYSize(h);
+      gl.glMatrixMode(GL.GL_PROJECTION);
+      gl.glLoadIdentity();
+      glu.gluPerspective(theta, aspect, 1, 100);
+      gl.glMatrixMode(GL.GL_MODELVIEW);
+      gl.glLoadIdentity();
+    }
+
+    // Unused routines
+    public void displayChanged(GLDrawable drawable, boolean modeChanged, boolean deviceChanged) {}
+  }
+
+  public static void main(String[] args) {
+    Frame frame = new Frame("Translate2 Test");
+    frame.addWindowListener(new WindowAdapter() {
+        public void windowClosing(WindowEvent e) {
+          System.exit(0);
+        }
+      });
+    frame.setLayout(new BorderLayout());
+    GLCanvas canvas =
+      GLDrawableFactory.getFactory().createGLCanvas(new GLCapabilities());
+    canvas.setSize(400, 400);
+    canvas.addGLEventListener(new Listener());
+    frame.add(canvas, BorderLayout.CENTER);
+    frame.pack();
+    frame.show();
+  }
+}
diff --git a/src/gleem/Translate1Manip.java b/src/gleem/Translate1Manip.java
new file mode 100644
index 0000000..541173f
--- /dev/null
+++ b/src/gleem/Translate1Manip.java
@@ -0,0 +1,208 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem;
+
+import java.util.*;
+
+import gleem.linalg.*;
+import net.java.games.jogl.*;
+
+/** A Translate1Manip is a Manip which translates in only one
+    dimension and whose default representation is a two-way arrow. */
+
+public class Translate1Manip extends Manip {
+  private ManipPart parts;
+  private Vec3f translation;
+  /** Normalized */
+  private Vec3f axis;
+  private Vec3f scale;
+  /** Local-to-world transform for geometry */
+  private Mat4f xform;
+
+  /** Dragging state */
+  private Line dragLine;
+  /** Dragging state */
+  private Vec3f dragOffset;
+
+  public Translate1Manip() {
+    parts       = new ManipPartTwoWayArrow();
+    translation = new Vec3f(0, 0, 0);
+    axis        = new Vec3f(1, 0, 0);
+    scale       = new Vec3f(1, 1, 1);
+    xform	= new Mat4f();
+    dragLine	= new Line();
+    dragOffset  = new Vec3f();
+    recalc();
+  }
+  
+  /** Set the translation of this Translate1Manip. This moves its
+      on-screen representation. Manipulations cause the translation to
+      be modified, not overwritten, so if you want the default
+      Translate1Manip to go through the point (0, 1, 0) but still
+      translate along the X axis, then setTranslation(0, 1, 0). */
+  public void setTranslation(Vec3f translation) {
+    this.translation.set(translation);
+    recalc();
+  }
+
+  /** Get the translation of this Translate1Manip. This corresponds to
+      the center of its body. */
+  public Vec3f getTranslation() {
+    return new Vec3f(translation);
+  }
+
+  /** Set the axis of this Translate1Manip. This is the direction
+      along which it will travel. Does not need to be normalized, but
+      must not be the zero vector. */
+  public void setAxis(Vec3f axis) {
+    this.axis.set(axis);
+    recalc();
+  }
+
+  /** Get the axis of this Translate1Manip. */
+  public Vec3f getAxis() {
+    return new Vec3f(axis);
+  }
+  
+  /** Set the scale of the Translate1Manip. This only affects the size
+      of the on-screen geometry. */
+  public void setScale(Vec3f scale) {
+    this.scale.set(scale);
+    recalc();
+  }
+
+  public Vec3f getScale() {
+    return new Vec3f(scale);
+  }
+
+  /** Change the geometry of this manipulator to be the user-defined
+      piece. */
+  public void replaceGeometry(ManipPart geom) {
+    parts = geom;
+  }
+
+  public void intersectRay(Vec3f rayStart,
+			   Vec3f rayDirection,
+			   List results) {
+    parts.intersectRay(rayStart, rayDirection, results, this);
+  }
+
+  public void highlight(HitPoint hit) {
+    if (hit.manipPart != parts) {
+      throw new RuntimeException("My old geometry disappeared; how did this happen?");
+    }
+    parts.highlight();
+  }
+  
+  public void clearHighlight() {
+    parts.clearHighlight();
+  }
+
+  public void makeActive(HitPoint hit) {
+    parts.highlight();
+    dragLine.setDirection(axis);
+    dragLine.setPoint(hit.intPt.getIntersectionPoint());
+    dragOffset.sub(translation, hit.intPt.getIntersectionPoint());
+  }
+
+  public void drag(Vec3f rayStart,
+		   Vec3f rayDirection) {
+    // Algorithm: Find closest point of ray to dragLine. Add dragOffset
+    // to this point to get new translation.
+    Vec3f closestPoint = new Vec3f();
+    if (dragLine.closestPointToRay(rayStart,
+				   rayDirection,
+				   closestPoint) == false) {
+      // Drag axis is parallel to ray. Punt.
+      return;
+    }
+    translation.set(closestPoint);
+    translation.add(dragOffset);
+    recalc();
+    super.drag(rayStart, rayDirection);
+  }
+
+  public void makeInactive() {
+    parts.clearHighlight();
+  }
+  
+  public void render(GL gl) {
+    parts.render(gl);
+  }
+
+  private void recalc() {
+    // Construct local to world transform for geometry.
+    // Scale, Rotation, Translation. Since we're right multiplying
+    // column vectors, the actual matrix composed is TRS.
+    Mat4f scaleMat = new Mat4f();
+    Mat4f rotMat   = new Mat4f();
+    Mat4f xlateMat = new Mat4f();
+    Mat4f tmpMat   = new Mat4f();
+    scaleMat.makeIdent();
+    scaleMat.set(0, 0, scale.x());
+    scaleMat.set(1, 1, scale.y());
+    scaleMat.set(2, 2, scale.z());
+    // Perpendiculars
+    Vec3f p0 = new Vec3f();
+    Vec3f p1 = new Vec3f();
+    MathUtil.makePerpendicular(axis, p0);
+    p1.cross(axis, p0);
+    // axis, p0, p1 correspond to x, y, z
+    p0.normalize();
+    p1.normalize();
+    rotMat.makeIdent();
+    rotMat.set(0, 0, axis.x());
+    rotMat.set(1, 0, axis.y());
+    rotMat.set(2, 0, axis.z());
+    rotMat.set(0, 1, p0.x());
+    rotMat.set(1, 1, p0.y());
+    rotMat.set(2, 1, p0.z());
+    rotMat.set(0, 2, p1.x());
+    rotMat.set(1, 2, p1.y());
+    rotMat.set(2, 2, p1.z());
+    xlateMat.makeIdent();
+    xlateMat.set(0, 3, translation.x());
+    xlateMat.set(1, 3, translation.y());
+    xlateMat.set(2, 3, translation.z());
+    tmpMat.mul(xlateMat, rotMat);
+    xform.mul(tmpMat, scaleMat);
+    parts.setTransform(xform);
+  }
+}
diff --git a/src/gleem/Translate2Manip.java b/src/gleem/Translate2Manip.java
new file mode 100644
index 0000000..a76df48
--- /dev/null
+++ b/src/gleem/Translate2Manip.java
@@ -0,0 +1,230 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem;
+
+import java.util.*;
+
+import gleem.linalg.*;
+import net.java.games.jogl.*;
+
+/** A Translate2Manip is a Manip which translates in two dimensions and
+    whose default representation is two arrows. */
+
+public class Translate2Manip extends Manip {
+  private ManipPart parts;
+  private Vec3f translation;
+  /** Normalized */
+  private Vec3f normal;
+  private Vec3f scale;
+  /** Local-to-world transform for geometry */
+  private Mat4f xform;
+
+  /** Dragging state */
+  private Plane dragPlane;
+  /** Dragging state */
+  private Vec3f dragOffset;
+
+  public Translate2Manip() {
+    parts       = createGeometry();
+    translation = new Vec3f(0, 0, 0);
+    normal      = new Vec3f(0, 1, 0);
+    scale       = new Vec3f(1, 1, 1);
+    xform	= new Mat4f();
+    dragPlane	= new Plane();
+    dragOffset  = new Vec3f();
+    recalc();
+  }
+  
+  /** Set the translation of this Translate2Manip. This moves its
+      on-screen representation. Manipulations cause the translation to
+      be modified, not overwritten, so if you want the default
+      Translate2Manip to go through the point (0, 1, 0) but still
+      translate in the X-Z plane, then setTranslation(0, 1, 0). */
+  public void setTranslation(Vec3f translation) {
+    this.translation.set(translation);
+    recalc();
+  }
+
+  /** Get the translation of this Translate2Manip. This corresponds to
+      the center of its body. */
+  public Vec3f getTranslation() {
+    return new Vec3f(translation);
+  }
+
+  /** Set the normal of this Translate2Manip. The manip moves in the
+      plane containing its current position and perpendicular to this
+      normal. Does not need to be normalized, but must not be the zero
+      vector. */
+  public void setNormal(Vec3f normal) {
+    this.normal.set(normal);
+    this.normal.normalize();
+    recalc();
+  }
+
+  /** Get the normal of this Translate2Manip. */
+  public Vec3f getNormal() {
+    return new Vec3f(normal);
+  }
+  
+  /** Set the scale of the Translate2Manip. This only affects the size
+      of the on-screen geometry. */
+  public void setScale(Vec3f scale) {
+    this.scale.set(scale);
+    recalc();
+  }
+
+  public Vec3f getScale() {
+    return new Vec3f(scale);
+  }
+
+  /** Change the geometry of this manipulator to be the user-defined
+      piece. */
+  public void replaceGeometry(ManipPart geom) {
+    parts = geom;
+  }
+
+  public void intersectRay(Vec3f rayStart,
+			   Vec3f rayDirection,
+			   List results) {
+    parts.intersectRay(rayStart, rayDirection, results, this);
+  }
+
+  public void highlight(HitPoint hit) {
+    if (hit.manipPart != parts) {
+      throw new RuntimeException("My old geometry disappeared; how did this happen?");
+    }
+    parts.highlight();
+  }
+  
+  public void clearHighlight() {
+    parts.clearHighlight();
+  }
+
+  public void makeActive(HitPoint hit) {
+    parts.highlight();
+    dragPlane.setNormal(normal);
+    dragPlane.setPoint(hit.intPt.getIntersectionPoint());
+    dragOffset.sub(translation, hit.intPt.getIntersectionPoint());
+  }
+
+  public void drag(Vec3f rayStart,
+		   Vec3f rayDirection) {
+    // Algorithm: Find intersection of ray with dragPlane. Add
+    // dragOffset to this point to get new translation.
+    IntersectionPoint intPt = new IntersectionPoint();
+    if (dragPlane.intersectRay(rayStart,
+                               rayDirection,
+                               intPt) == false) {
+      // Ray is parallel to plane. Punt.
+      return;
+    }
+    translation.set(intPt.getIntersectionPoint());
+    translation.add(dragOffset);
+    recalc();
+    super.drag(rayStart, rayDirection);
+  }
+
+  public void makeInactive() {
+    parts.clearHighlight();
+  }
+  
+  public void render(GL gl) {
+    parts.render(gl);
+  }
+
+  private ManipPart createGeometry() {
+    ManipPartGroup group = new ManipPartGroup();
+    ManipPartTwoWayArrow arrow1 = new ManipPartTwoWayArrow();
+    group.addChild(arrow1);
+    ManipPartTransform xform = new ManipPartTransform();
+    Mat4f rotMat = new Mat4f();
+    rotMat.makeIdent();
+    rotMat.set(0, 0, 0);
+    rotMat.set(1, 0, 0);
+    rotMat.set(2, 0, -1);
+    rotMat.set(0, 2, 1);
+    rotMat.set(1, 2, 0);
+    rotMat.set(2, 2, 0);
+    xform.setOffsetTransform(rotMat);
+    ManipPartTwoWayArrow arrow2 = new ManipPartTwoWayArrow();
+    xform.addChild(arrow2);
+    group.addChild(xform);
+    return group;
+  }
+
+  private void recalc() {
+    // Construct local to world transform for geometry.
+    // Scale, Rotation, Translation. Since we're right multiplying
+    // column vectors, the actual matrix composed is TRS.
+    Mat4f scaleMat = new Mat4f();
+    Mat4f rotMat   = new Mat4f();
+    Mat4f xlateMat = new Mat4f();
+    Mat4f tmpMat   = new Mat4f();
+    scaleMat.makeIdent();
+    scaleMat.set(0, 0, scale.x());
+    scaleMat.set(1, 1, scale.y());
+    scaleMat.set(2, 2, scale.z());
+    // Perpendiculars
+    Vec3f p0 = new Vec3f();
+    Vec3f p1 = new Vec3f();
+    MathUtil.makePerpendicular(normal, p0);
+    p1.cross(normal, p0);
+    // p1, normal, p0 correspond to x, y, z
+    p0.normalize();
+    p1.normalize();
+    rotMat.makeIdent();
+    rotMat.set(0, 0, p1.x());
+    rotMat.set(1, 0, p1.y());
+    rotMat.set(2, 0, p1.z());
+    rotMat.set(0, 1, normal.x());
+    rotMat.set(1, 1, normal.y());
+    rotMat.set(2, 1, normal.z());
+    rotMat.set(0, 2, p0.x());
+    rotMat.set(1, 2, p0.y());
+    rotMat.set(2, 2, p0.z());
+    xlateMat.makeIdent();
+    xlateMat.set(0, 3, translation.x());
+    xlateMat.set(1, 3, translation.y());
+    xlateMat.set(2, 3, translation.z());
+    tmpMat.mul(xlateMat, rotMat);
+    xform.mul(tmpMat, scaleMat);
+    parts.setTransform(xform);
+  }
+}
diff --git a/src/gleem/WindowUpdateListener.java b/src/gleem/WindowUpdateListener.java
new file mode 100644
index 0000000..b91ee05
--- /dev/null
+++ b/src/gleem/WindowUpdateListener.java
@@ -0,0 +1,51 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem;
+
+import net.java.games.jogl.*;
+
+/** A WindowUpdateListener is used by the ManipManager to transmit
+    repaint() notifications to windows containing Manips. When a Manip
+    is moved, the ManipManager sends update notifications to all
+    GLDrawables in which that Manip is shown. */
+
+public interface WindowUpdateListener {
+  public void update(GLDrawable window);
+}
diff --git a/src/gleem/linalg/DimensionMismatchException.java b/src/gleem/linalg/DimensionMismatchException.java
new file mode 100644
index 0000000..612d49d
--- /dev/null
+++ b/src/gleem/linalg/DimensionMismatchException.java
@@ -0,0 +1,53 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem.linalg;
+
+/** Thrown to indicate a mismatch of dimensionality of a matrix or
+    vector. */
+
+public class DimensionMismatchException extends RuntimeException {
+  public DimensionMismatchException() {
+    super();
+  }
+
+  public DimensionMismatchException(String msg) {
+    super(msg);
+  }
+}
diff --git a/src/gleem/linalg/IntersectionPoint.java b/src/gleem/linalg/IntersectionPoint.java
new file mode 100644
index 0000000..486be06
--- /dev/null
+++ b/src/gleem/linalg/IntersectionPoint.java
@@ -0,0 +1,63 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem.linalg;
+
+/** Wraps a 3D point and parametric time value. */
+
+public class IntersectionPoint {
+  private Vec3f intPt = new Vec3f();
+  private float t;
+
+  public Vec3f getIntersectionPoint() {
+    return intPt;
+  }
+
+  public void setIntersectionPoint(Vec3f newPt) {
+    intPt.set(newPt);
+  }
+
+  public float getT() {
+    return t;
+  }
+
+  public void setT(float t) {
+    this.t = t;
+  }
+}
diff --git a/src/gleem/linalg/Line.java b/src/gleem/linalg/Line.java
new file mode 100644
index 0000000..cbf8efd
--- /dev/null
+++ b/src/gleem/linalg/Line.java
@@ -0,0 +1,152 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem.linalg;
+
+/** Represents a line in 3D space. */
+
+public class Line {
+  private Vec3f point;
+  /** Normalized */
+  private Vec3f direction;
+  /** For computing projections along line */
+  private Vec3f alongVec;
+
+  /** Default constructor initializes line to point (0, 0, 0) and
+      direction (1, 0, 0) */
+  public Line() {
+    point = new Vec3f(0, 0, 0);
+    direction = new Vec3f(1, 0, 0);
+    alongVec = new Vec3f();
+    recalc();
+  }
+
+  /** Line goes in direction <b>direction</b> through the point
+      <b>point</b>. <b>direction</b> does not need to be normalized but must
+      not be the zero vector. */
+  public Line(Vec3f direction, Vec3f point) {
+    direction = new Vec3f(direction);
+    direction.normalize();
+    point = new Vec3f(point);
+    alongVec = new Vec3f();
+    recalc();
+  }
+
+  /** Setter does some work to maintain internal caches.
+      <b>direction</b> does not need to be normalized but must not be
+      the zero vector. */
+  public void setDirection(Vec3f direction) {
+    this.direction.set(direction);
+    this.direction.normalize();
+    recalc();
+  }
+
+  /** Direction is normalized internally, so <b>direction</b> is not
+      necessarily equal to <code>plane.setDirection(direction);
+      plane.getDirection();</code> */
+  public Vec3f getDirection() {
+    return direction;
+  }
+
+  /** Setter does some work to maintain internal caches. */
+  public void setPoint(Vec3f point) {
+    this.point.set(point);
+    recalc();
+  }
+
+  public Vec3f getPoint() {
+    return point;
+  }
+
+  /** Project a point onto the line */
+  public void projectPoint(Vec3f pt,
+                           Vec3f projPt) {
+    float dotp = direction.dot(pt);
+    projPt.set(direction);
+    projPt.scale(dotp);
+    projPt.add(alongVec);
+  }
+
+  /** Find closest point on this line to the given ray, specified by
+      start point and direction. If ray is parallel to this line,
+      returns false and closestPoint is not modified. */
+  public boolean closestPointToRay(Vec3f rayStart,
+                                   Vec3f rayDirection,
+                                   Vec3f closestPoint) {
+    // Line 1 is this one. Line 2 is the incoming one.
+    Mat2f A = new Mat2f();
+    A.set(0, 0, -direction.lengthSquared());
+    A.set(1, 1, -rayDirection.lengthSquared());
+    A.set(0, 1, direction.dot(rayDirection));
+    A.set(1, 0, A.get(0, 1));
+    if (Math.abs(A.determinant()) == 0.0f) {
+      return false;
+    }
+    if (!A.invert()) {
+      return false;
+    }
+    Vec2f b = new Vec2f();
+    b.setX(point.dot(direction) - rayStart.dot(direction));
+    b.setY(rayStart.dot(rayDirection) - point.dot(rayDirection));
+    Vec2f x = new Vec2f();
+    A.xformVec(b, x);
+    if (x.y() < 0) {
+      // Means that ray start is closest point to this line
+      closestPoint.set(rayStart);
+    } else {
+      closestPoint.set(direction);
+      closestPoint.scale(x.x());
+      closestPoint.add(point);
+    }
+    return true;
+  }
+
+  //----------------------------------------------------------------------
+  // Internals only below this point
+  //
+  
+  private void recalc() {
+    float denom = direction.lengthSquared();
+    if (denom == 0.0f) {
+      throw new RuntimeException("Line.recalc: ERROR: direction was the zero vector " +
+                                 "(not allowed)");
+    }
+    alongVec.set(point.minus(direction.times(point.dot(direction))));
+  }
+}
diff --git a/src/gleem/linalg/Mat2f.java b/src/gleem/linalg/Mat2f.java
new file mode 100644
index 0000000..6852dbc
--- /dev/null
+++ b/src/gleem/linalg/Mat2f.java
@@ -0,0 +1,169 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem.linalg;
+
+/** 2x2 matrix class useful for simple linear algebra. Representation
+    is (as Mat4f) in row major order and assumes multiplication by
+    column vectors on the right. */
+
+public class Mat2f {
+  private float[] data;
+
+  /** Creates new matrix initialized to the zero matrix */
+  public Mat2f() {
+    data = new float[4];
+  }
+
+  /** Initialize to the identity matrix. */
+  public void makeIdent() {
+    for (int i = 0; i < 2; i++) {
+      for (int j = 0; j < 2; j++) {
+        if (i == j) {
+          set(i, j, 1.0f);
+        } else {
+          set(i, j, 0.0f);
+        }
+      }
+    }
+  }
+  
+  /** Gets the (i,j)th element of this matrix, where i is the row
+      index and j is the column index */
+  public float get(int i, int j) {
+    return data[2 * i + j];
+  }
+
+  /** Sets the (i,j)th element of this matrix, where i is the row
+      index and j is the column index */
+  public void set(int i, int j, float val) {
+    data[2 * i + j] = val;
+  }
+
+  /** Set column i (i=[0..1]) to vector v. */
+  public void setCol(int i, Vec2f v) {
+    set(0, i, v.x());
+    set(1, i, v.y());
+  }
+
+  /** Set row i (i=[0..1]) to vector v. */
+  public void setRow(int i, Vec2f v) {
+    set(i, 0, v.x());
+    set(i, 1, v.y());
+  }
+
+  /** Transpose this matrix in place. */
+  public void transpose() {
+    float t = get(0, 1);
+    set(0, 1, get(1, 0));
+    set(1, 0, t);
+  }
+
+  /** Return the determinant. */
+  public float determinant() {
+    return (get(0, 0) * get(1, 1) - get(1, 0) * get(0, 1));
+  }  
+
+  /** Full matrix inversion in place. If matrix is singular, returns
+      false and matrix contents are untouched. If you know the matrix
+      is orthonormal, you can call transpose() instead. */
+  public boolean invert() {
+    float det = determinant();
+    if (det == 0.0f)
+      return false;
+
+    // Create transpose of cofactor matrix in place
+    float t = get(0, 0);
+    set(0, 0, get(1, 1));
+    set(1, 1, t);
+    set(0, 1, -get(0, 1));
+    set(1, 0, -get(1, 0));
+  
+    // Now divide by determinant
+    for (int i = 0; i < 4; i++) {
+      data[i] /= det;
+    }
+    return true;
+  }
+
+  /** Multiply a 2D vector by this matrix. NOTE: src and dest must be
+      different vectors. */
+  public void xformVec(Vec2f src, Vec2f dest) {
+    dest.set(get(0, 0) * src.x() +
+             get(0, 1) * src.y(),
+
+             get(1, 0) * src.x() +
+             get(1, 1) * src.y());
+  }
+
+  /** Returns this * b; creates new matrix */
+  public Mat2f mul(Mat2f b) {
+    Mat2f tmp = new Mat2f();
+    tmp.mul(this, b);
+    return tmp;
+  }
+
+  /** this = a * b */
+  public void mul(Mat2f a, Mat2f b) {
+    for (int rc = 0; rc < 2; rc++)
+      for (int cc = 0; cc < 2; cc++) {
+        float tmp = 0.0f;
+        for (int i = 0; i < 2; i++)
+          tmp += a.get(rc, i) * b.get(i, cc);
+        set(rc, cc, tmp);
+      }
+  }
+
+  public Matf toMatf() {
+    Matf out = new Matf(2, 2);
+    for (int i = 0; i < 2; i++) {
+      for (int j = 0; j < 2; j++) {
+        out.set(i, j, get(i, j));
+      }
+    }
+    return out;
+  }
+
+  public String toString() {
+    String endl = System.getProperty("line.separator");
+    return "(" +
+      get(0, 0) + ", " + get(0, 1) + endl +
+      get(1, 0) + ", " + get(1, 1) + ")";
+  }
+}
diff --git a/src/gleem/linalg/Mat3f.java b/src/gleem/linalg/Mat3f.java
new file mode 100644
index 0000000..024df82
--- /dev/null
+++ b/src/gleem/linalg/Mat3f.java
@@ -0,0 +1,194 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem.linalg;
+
+/** 3x3 matrix class useful for simple linear algebra. Representation
+    is (as Mat4f) in row major order and assumes multiplication by
+    column vectors on the right. */
+
+public class Mat3f {
+  private float[] data;
+
+  /** Creates new matrix initialized to the zero matrix */
+  public Mat3f() {
+    data = new float[9];
+  }
+
+  /** Initialize to the identity matrix. */
+  public void makeIdent() {
+    for (int i = 0; i < 3; i++) {
+      for (int j = 0; j < 3; j++) {
+        if (i == j) {
+          set(i, j, 1.0f);
+        } else {
+          set(i, j, 0.0f);
+        }
+      }
+    }
+  }
+  
+  /** Gets the (i,j)th element of this matrix, where i is the row
+      index and j is the column index */
+  public float get(int i, int j) {
+    return data[3 * i + j];
+  }
+
+  /** Sets the (i,j)th element of this matrix, where i is the row
+      index and j is the column index */
+  public void set(int i, int j, float val) {
+    data[3 * i + j] = val;
+  }
+
+  /** Set column i (i=[0..2]) to vector v. */
+  public void setCol(int i, Vec3f v) {
+    set(0, i, v.x());
+    set(1, i, v.y());
+    set(2, i, v.z());
+  }
+
+  /** Set row i (i=[0..2]) to vector v. */
+  public void setRow(int i, Vec3f v) {
+    set(i, 0, v.x());
+    set(i, 1, v.y());
+    set(i, 2, v.z());
+  }
+
+  /** Transpose this matrix in place. */
+  public void transpose() {
+    float t;
+    t = get(0, 1);
+    set(0, 1, get(1, 0));
+    set(1, 0, t);
+
+    t = get(0, 2);
+    set(0, 2, get(2, 0));
+    set(2, 0, t);
+
+    t = get(1, 2);
+    set(1, 2, get(2, 1));
+    set(2, 1, t);
+  }
+
+  /** Return the determinant. Computed across the zeroth row. */
+  public float determinant() {
+    return (get(0, 0) * (get(1, 1) * get(2, 2) - get(2, 1) * get(1, 2)) +
+            get(0, 1) * (get(2, 0) * get(1, 2) - get(1, 0) * get(2, 2)) +
+            get(0, 2) * (get(1, 0) * get(2, 1) - get(2, 0) * get(1, 1)));
+  }
+
+  /** Full matrix inversion in place. If matrix is singular, returns
+      false and matrix contents are untouched. If you know the matrix
+      is orthonormal, you can call transpose() instead. */
+  public boolean invert() {
+    float det = determinant();
+    if (det == 0.0f)
+      return false;
+
+    // Form cofactor matrix
+    Mat3f cf = new Mat3f();
+    cf.set(0, 0, get(1, 1) * get(2, 2) - get(2, 1) * get(1, 2));
+    cf.set(0, 1, get(2, 0) * get(1, 2) - get(1, 0) * get(2, 2));
+    cf.set(0, 2, get(1, 0) * get(2, 1) - get(2, 0) * get(1, 1));
+    cf.set(1, 0, get(2, 1) * get(0, 2) - get(0, 1) * get(2, 2));
+    cf.set(1, 1, get(0, 0) * get(2, 2) - get(2, 0) * get(0, 2));
+    cf.set(1, 2, get(2, 0) * get(0, 1) - get(0, 0) * get(2, 1));
+    cf.set(2, 0, get(0, 1) * get(1, 2) - get(1, 1) * get(0, 2));
+    cf.set(2, 1, get(1, 0) * get(0, 2) - get(0, 0) * get(1, 2));
+    cf.set(2, 2, get(0, 0) * get(1, 1) - get(1, 0) * get(0, 1));
+
+    // Now copy back transposed
+    for (int i = 0; i < 3; i++)
+      for (int j = 0; j < 3; j++)
+        set(i, j, cf.get(j, i) / det);
+    return true;
+  }
+
+  /** Multiply a 3D vector by this matrix. NOTE: src and dest must be
+      different vectors. */
+  public void xformVec(Vec3f src, Vec3f dest) {
+    dest.set(get(0, 0) * src.x() +
+             get(0, 1) * src.y() +
+             get(0, 2) * src.z(),
+             
+             get(1, 0) * src.x() +
+             get(1, 1) * src.y() +
+             get(1, 2) * src.z(),
+
+             get(2, 0) * src.x() +
+             get(2, 1) * src.y() +
+             get(2, 2) * src.z());
+  }
+
+  /** Returns this * b; creates new matrix */
+  public Mat3f mul(Mat3f b) {
+    Mat3f tmp = new Mat3f();
+    tmp.mul(this, b);
+    return tmp;
+  }
+
+  /** this = a * b */
+  public void mul(Mat3f a, Mat3f b) {
+    for (int rc = 0; rc < 3; rc++)
+      for (int cc = 0; cc < 3; cc++) {
+        float tmp = 0.0f;
+        for (int i = 0; i < 3; i++)
+          tmp += a.get(rc, i) * b.get(i, cc);
+        set(rc, cc, tmp);
+      }
+  }
+
+  public Matf toMatf() {
+    Matf out = new Matf(3, 3);
+    for (int i = 0; i < 3; i++) {
+      for (int j = 0; j < 3; j++) {
+        out.set(i, j, get(i, j));
+      }
+    }
+    return out;
+  }
+
+  public String toString() {
+    String endl = System.getProperty("line.separator");
+    return "(" +
+      get(0, 0) + ", " + get(0, 1) + ", " + get(0, 2) + endl +
+      get(1, 0) + ", " + get(1, 1) + ", " + get(1, 2) + endl +
+      get(2, 0) + ", " + get(2, 1) + ", " + get(2, 2) + ")";
+  }
+}
diff --git a/src/gleem/linalg/Mat4f.java b/src/gleem/linalg/Mat4f.java
new file mode 100644
index 0000000..ed16cc6
--- /dev/null
+++ b/src/gleem/linalg/Mat4f.java
@@ -0,0 +1,265 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem.linalg;
+
+/** A (very incomplete) 4x4 matrix class. Representation assumes
+    multiplication by column vectors on the right. */
+
+public class Mat4f {
+  private float[] data;
+
+  /** Creates new matrix initialized to the zero matrix */
+  public Mat4f() {
+    data = new float[16];
+  }
+
+  /** Creates new matrix initialized to argument's contents */
+  public Mat4f(Mat4f arg) {
+    this();
+    set(arg);
+  }
+
+  /** Sets this matrix to the identity matrix */
+  public void makeIdent() {
+    for (int i = 0; i < 4; i++) {
+      for (int j = 0; j < 4; j++) {
+        if (i == j) {
+          set(i, j, 1.0f);
+        } else {
+          set(i, j, 0.0f);
+        }
+      }
+    }
+  }
+
+  /** Sets this matrix to be equivalent to the given one */
+  public void set(Mat4f arg) {
+    float[] mine = data;
+    float[] yours = arg.data;
+    for (int i = 0; i < mine.length; i++) {
+      mine[i] = yours[i];
+    }
+  }
+
+  /** Gets the (i,j)th element of this matrix, where i is the row
+      index and j is the column index */
+  public float get(int i, int j) {
+    return data[4 * i + j];
+  }
+
+  /** Sets the (i,j)th element of this matrix, where i is the row
+      index and j is the column index */
+  public void set(int i, int j, float val) {
+    data[4 * i + j] = val;
+  }
+
+  /** Sets the translation component of this matrix (i.e., the three
+      top elements of the third column) without touching any of the
+      other parts of the matrix */
+  public void setTranslation(Vec3f trans) {
+    set(0, 3, trans.x());
+    set(1, 3, trans.y());
+    set(2, 3, trans.z());
+  }
+
+  /** Sets the rotation component of this matrix (i.e., the upper left
+      3x3) without touching any of the other parts of the matrix */
+  public void setRotation(Rotf rot) {
+    rot.toMatrix(this);
+  }
+
+  /** Sets the upper-left 3x3 of this matrix assuming that the given
+      x, y, and z vectors form an orthonormal basis */
+  public void setRotation(Vec3f x, Vec3f y, Vec3f z) {
+    set(0, 0, x.x());
+    set(1, 0, x.y());
+    set(2, 0, x.z());
+
+    set(0, 1, y.x());
+    set(1, 1, y.y());
+    set(2, 1, y.z());
+
+    set(0, 2, z.x());
+    set(1, 2, z.y());
+    set(2, 2, z.z());
+  }
+
+  /** Gets the upper left 3x3 of this matrix as a rotation. Currently
+      does not work if there are scales. Ignores translation
+      component. */
+  public void getRotation(Rotf rot) {
+    rot.fromMatrix(this);
+  }
+
+  /** Sets the elements (0, 0), (1, 1), and (2, 2) with the
+      appropriate elements of the given three-dimensional scale
+      vector. Does not perform a full multiplication of the upper-left
+      3x3; use this with an identity matrix in conjunction with
+      <code>mul</code> for that. */
+  public void setScale(Vec3f scale) {
+    set(0, 0, scale.x());
+    set(1, 1, scale.y());
+    set(2, 2, scale.z());
+  }
+
+  /** Inverts this matrix assuming that it represents a rigid
+      transform (i.e., some combination of rotations and
+      translations). Assumes column vectors. Algorithm: transposes
+      upper left 3x3; negates translation in rightmost column and
+      transforms by inverted rotation. */
+  public void invertRigid() {
+    float t;
+    // Transpose upper left 3x3
+    t = get(0, 1);
+    set(0, 1, get(1, 0));
+    set(1, 0, t);
+    t = get(0, 2);
+    set(0, 2, get(2, 0));
+    set(2, 0, t);
+    t = get(1, 2);
+    set(1, 2, get(2, 1));
+    set(2, 1, t);
+    // Transform negative translation by this
+    Vec3f negTrans = new Vec3f(-get(0, 3), -get(1, 3), -get(2, 3));
+    Vec3f trans = new Vec3f();
+    xformDir(negTrans, trans);
+    set(0, 3, trans.x());
+    set(1, 3, trans.y());
+    set(2, 3, trans.z());
+  }
+
+  /** Returns this * b; creates new matrix */
+  public Mat4f mul(Mat4f b) {
+    Mat4f tmp = new Mat4f();
+    tmp.mul(this, b);
+    return tmp;
+  }
+
+  /** this = a * b */
+  public void mul(Mat4f a, Mat4f b) {
+    for (int rc = 0; rc < 4; rc++)
+      for (int cc = 0; cc < 4; cc++) {
+        float tmp = 0.0f;
+        for (int i = 0; i < 4; i++)
+          tmp += a.get(rc, i) * b.get(i, cc);
+        set(rc, cc, tmp);
+      }
+  }
+  
+  /** Transpose this matrix in place. */
+  public void transpose() {
+    float t;
+    for (int i = 0; i < 4; i++) {
+      for (int j = 0; j < i; j++) {
+        t = get(i, j);
+        set(i, j, get(j, i));
+        set(j, i, t);
+      }
+    }
+  }
+
+  /** Multiply a 4D vector by this matrix. NOTE: src and dest must be
+      different vectors. */
+  public void xformVec(Vec4f src, Vec4f dest) {
+    for (int rc = 0; rc < 4; rc++) {
+      float tmp = 0.0f;
+      for (int cc = 0; cc < 4; cc++) {
+        tmp += get(rc, cc) * src.get(cc);
+      }
+      dest.set(rc, tmp);
+    }
+  }
+
+  /** Transforms a 3D vector as though it had a homogeneous coordinate
+      and assuming that this matrix represents only rigid
+      transformations; i.e., is not a full transformation. NOTE: src
+      and dest must be different vectors. */
+  public void xformPt(Vec3f src, Vec3f dest) {
+    for (int rc = 0; rc < 3; rc++) {
+      float tmp = 0.0f;
+      for (int cc = 0; cc < 3; cc++) {
+        tmp += get(rc, cc) * src.get(cc);
+      }
+      tmp += get(rc, 3);
+      dest.set(rc, tmp);
+    }
+  }
+  
+  /** Transforms src using only the upper left 3x3. NOTE: src and dest
+      must be different vectors. */
+  public void xformDir(Vec3f src, Vec3f dest) {
+    for (int rc = 0; rc < 3; rc++) {
+      float tmp = 0.0f;
+      for (int cc = 0; cc < 3; cc++) {
+        tmp += get(rc, cc) * src.get(cc);
+      }
+      dest.set(rc, tmp);
+    }
+  }
+  
+  /** Copies data in column-major (OpenGL format) order into passed
+      float array, which must have length 16 or greater. */
+  public void getColumnMajorData(float[] out) {
+    for (int i = 0; i < 4; i++) {
+      for (int j = 0; j < 4; j++) {
+        out[4 * j + i] = get(i, j);
+      }
+    }
+  }
+
+  public Matf toMatf() {
+    Matf out = new Matf(4, 4);
+    for (int i = 0; i < 4; i++) {
+      for (int j = 0; j < 4; j++) {
+        out.set(i, j, get(i, j));
+      }
+    }
+    return out;
+  }
+
+  public String toString() {
+    String endl = System.getProperty("line.separator");
+    return "(" +
+      get(0, 0) + ", " + get(0, 1) + ", " + get(0, 2) + ", " + get(0, 3) + endl +
+      get(1, 0) + ", " + get(1, 1) + ", " + get(1, 2) + ", " + get(1, 3) + endl +
+      get(2, 0) + ", " + get(2, 1) + ", " + get(2, 2) + ", " + get(2, 3) + endl +
+      get(3, 0) + ", " + get(3, 1) + ", " + get(3, 2) + ", " + get(3, 3) + ")";
+  }
+}
diff --git a/src/gleem/linalg/Matf.java b/src/gleem/linalg/Matf.java
new file mode 100644
index 0000000..ae4ef92
--- /dev/null
+++ b/src/gleem/linalg/Matf.java
@@ -0,0 +1,168 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem.linalg;
+
+/** Arbitrary-size single-precision matrix class. Currently very
+    simple and only supports a few needed operations. */
+
+public class Matf {
+  private float[] data;
+  private int nCol; // number of columns
+  private int nRow; // number of columns
+
+  public Matf(int nRow, int nCol) {
+    data = new float[nRow * nCol];
+    this.nCol = nCol;
+    this.nRow = nRow;
+  }
+
+  public Matf(Matf arg) {
+    nRow = arg.nRow;
+    nCol = arg.nCol;
+    data = new float[nRow * nCol];
+    System.arraycopy(arg.data, 0, data, 0, data.length);
+  }
+
+  public int nRow() {
+    return nRow;
+  }
+
+  public int nCol() {
+    return nCol;
+  }
+
+  /** Gets the (i,j)th element of this matrix, where i is the row
+      index and j is the column index */
+  public float get(int i, int j) {
+    return data[nCol * i + j];
+  }
+  
+  /** Sets the (i,j)th element of this matrix, where i is the row
+      index and j is the column index */
+  public void set(int i, int j, float val) {
+    data[nCol * i + j] = val;
+  }
+
+  /** Returns transpose of this matrix; creates new matrix */
+  public Matf transpose() {
+    Matf tmp = new Matf(nCol, nRow);
+    for (int i = 0; i < nRow; i++) {
+      for (int j = 0; j < nCol; j++) {
+        tmp.set(j, i, get(i, j));
+      }
+    }
+    return tmp;
+  }
+  
+  /** Returns this * b; creates new matrix */
+  public Matf mul(Matf b) throws DimensionMismatchException {
+    if (nCol() != b.nRow())
+      throw new DimensionMismatchException();
+    Matf tmp = new Matf(nRow(), b.nCol());
+    for (int i = 0; i < nRow(); i++) {
+      for (int j = 0; j < b.nCol(); j++) {
+        float val = 0;
+        for (int t = 0; t < nCol(); t++) {
+          val += get(i, t) * b.get(t, j);
+        }
+        tmp.set(i, j, val);
+      }
+    }
+    return tmp;
+  }
+
+  /** Returns this * v, assuming v is a column vector. */
+  public Vecf mul(Vecf v) throws DimensionMismatchException {
+    if (nCol() != v.length()) {
+      throw new DimensionMismatchException();
+    }
+    Vecf out = new Vecf(nRow());
+    for (int i = 0; i < nRow(); i++) {
+      float tmp = 0;
+      for (int j = 0; j < nCol(); j++) {
+        tmp += get(i, j) * v.get(j);
+      }
+      out.set(i, tmp);
+    }
+    return out;
+  }
+
+  /** If this is a 2x2 matrix, returns it as a Mat2f. */
+  public Mat2f toMat2f() throws DimensionMismatchException {
+    if (nRow() != 2 || nCol() != 2) {
+      throw new DimensionMismatchException();
+    }
+    Mat2f tmp = new Mat2f();
+    for (int i = 0; i < 2; i++) {
+      for (int j = 0; j < 2; j++) {
+        tmp.set(i, j, get(i, j));
+      }
+    }
+    return tmp;
+  }
+
+  /** If this is a 3x3 matrix, returns it as a Mat3f. */
+  public Mat3f toMat3f() throws DimensionMismatchException {
+    if (nRow() != 3 || nCol() != 3) {
+      throw new DimensionMismatchException();
+    }
+    Mat3f tmp = new Mat3f();
+    for (int i = 0; i < 3; i++) {
+      for (int j = 0; j < 3; j++) {
+        tmp.set(i, j, get(i, j));
+      }
+    }
+    return tmp;
+  }
+
+  /** If this is a 4x4 matrix, returns it as a Mat4f. */
+  public Mat4f toMat4f() throws DimensionMismatchException {
+    if (nRow() != 4 || nCol() != 4) {
+      throw new DimensionMismatchException();
+    }
+    Mat4f tmp = new Mat4f();
+    for (int i = 0; i < 4; i++) {
+      for (int j = 0; j < 4; j++) {
+        tmp.set(i, j, get(i, j));
+      }
+    }
+    return tmp;
+  }
+}
diff --git a/src/gleem/linalg/MathUtil.java b/src/gleem/linalg/MathUtil.java
new file mode 100644
index 0000000..7415953
--- /dev/null
+++ b/src/gleem/linalg/MathUtil.java
@@ -0,0 +1,90 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem.linalg;
+
+/** Utility math routines. */
+
+public class MathUtil {
+  /** Makes an arbitrary vector perpendicular to <B>src</B> and
+      inserts it into <B>dest</B>. Returns false if the source vector
+      was equal to (0, 0, 0). */
+  public static boolean makePerpendicular(Vec3f src,
+                                          Vec3f dest) {
+    if ((src.x() == 0.0f) && (src.y() == 0.0f) && (src.z() == 0.0f)) {
+      return false;
+    }
+
+    if (src.x() != 0.0f) {
+      if (src.y() != 0.0f) {
+	dest.set(-src.y(), src.x(), 0.0f);
+      }	else {
+	dest.set(-src.z(), 0.0f, src.x());
+      }
+    } else {
+      dest.set(1.0f, 0.0f, 0.0f);
+    }
+    return true;
+  }
+
+  /** Returns 1 if the sign of the given argument is positive; -1 if
+      negative; 0 if 0. */
+  public static int sgn(float f) {
+    if (f > 0) {
+      return 1;
+    } else if (f < 0) {
+      return -1;
+    }
+    return 0;
+  }
+
+  /** Clamps argument between min and max values. */
+  public static float clamp(float val, float min, float max) {
+    if (val < min) return min;
+    if (val > max) return max;
+    return val;
+  }
+
+  /** Clamps argument between min and max values. */
+  public static int clamp(int val, int min, int max) {
+    if (val < min) return min;
+    if (val > max) return max;
+    return val;
+  }
+}
diff --git a/src/gleem/linalg/NonSquareMatrixException.java b/src/gleem/linalg/NonSquareMatrixException.java
new file mode 100644
index 0000000..efc0c6a
--- /dev/null
+++ b/src/gleem/linalg/NonSquareMatrixException.java
@@ -0,0 +1,53 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem.linalg;
+
+/** Thrown to indicate a non-square matrix during an operation
+    requiring one. */
+
+public class NonSquareMatrixException extends RuntimeException {
+  public NonSquareMatrixException() {
+    super();
+  }
+
+  public NonSquareMatrixException(String msg) {
+    super(msg);
+  }
+}
diff --git a/src/gleem/linalg/Plane.java b/src/gleem/linalg/Plane.java
new file mode 100644
index 0000000..fa58259
--- /dev/null
+++ b/src/gleem/linalg/Plane.java
@@ -0,0 +1,121 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem.linalg;
+
+/** Represents a plane in 3D space. */
+
+public class Plane {
+  /** Normalized */
+  private Vec3f normal;
+  private Vec3f point;
+  /** Constant for faster projection and intersection */
+  float c;
+
+  /** Default constructor initializes normal to (0, 1, 0) and point to
+      (0, 0, 0) */
+  public Plane() {
+    normal = new Vec3f(0, 1, 0);
+    point = new Vec3f(0, 0, 0);
+    recalc();
+  }
+
+  /** Sets all parameters of plane. Plane has normal <b>normal</b> and
+      goes through the point <b>point</b>. Normal does not need to be
+      unit length but must not be the zero vector. */
+  public Plane(Vec3f normal, Vec3f point) {
+    this.normal.set(normal);
+    this.normal.normalize();
+    this.point.set(point);
+    recalc();
+  }
+
+  /** Setter does some work to maintain internal caches. Normal does
+      not need to be unit length but must not be the zero vector. */
+  public void setNormal(Vec3f normal) {
+    this.normal.set(normal);
+    this.normal.normalize();
+    recalc();
+  }
+
+  /** Normal is normalized internally, so <b>normal</b> is not
+      necessarily equal to <code>plane.setNormal(normal);
+      plane.getNormal();</code> */
+  public Vec3f getNormal() {
+    return normal;
+  }
+
+  /** Setter does some work to maintain internal caches */
+  public void setPoint(Vec3f point) {
+    this.point.set(point);
+    recalc();
+  }
+
+  public Vec3f getPoint() {
+    return point;
+  }
+
+  /** Project a point onto the plane */
+  public void projectPoint(Vec3f pt,
+                           Vec3f projPt) {
+    float scale = normal.dot(pt) - c;
+    projPt.set(pt.minus(normal.times(normal.dot(point) - c)));
+  }
+
+  /** Intersect a ray with the plane. Returns true if intersection occurred, false
+      otherwise. This is a two-sided ray cast. */
+  public boolean intersectRay(Vec3f rayStart,
+                              Vec3f rayDirection,
+                              IntersectionPoint intPt) {
+    float denom = normal.dot(rayDirection);
+    if (denom == 0)
+      return false;
+    intPt.setT((c - normal.dot(rayStart)) / denom);
+    intPt.setIntersectionPoint(rayStart.plus(rayDirection.times(intPt.getT())));
+    return true;
+  }
+
+  //----------------------------------------------------------------------
+  // Internals only below this point
+  //
+  
+  private void recalc() {
+    c = normal.dot(point);
+  }
+}
diff --git a/src/gleem/linalg/PlaneUV.java b/src/gleem/linalg/PlaneUV.java
new file mode 100644
index 0000000..ff1baad
--- /dev/null
+++ b/src/gleem/linalg/PlaneUV.java
@@ -0,0 +1,203 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem.linalg;
+
+/** This differs from the Plane class in that it maintains an origin
+    and orthonormal U, V axes in the plane so that it can project a 3D
+    point to a 2D one. U cross V = normal. U and V coordinates are
+    computed with respect to the origin. */
+
+public class PlaneUV {
+  private Vec3f origin = new Vec3f();
+  /** Normalized */
+  private Vec3f normal = new Vec3f();
+  private Vec3f uAxis  = new Vec3f();
+  private Vec3f vAxis  = new Vec3f();
+
+  /** Default constructor initializes normal to (0, 1, 0), origin to
+      (0, 0, 0), U axis to (1, 0, 0) and V axis to (0, 0, -1). */
+  public PlaneUV() {
+    setEverything(new Vec3f(0, 1, 0),
+                  new Vec3f(0, 0, 0),
+                  new Vec3f(1, 0, 0),
+                  new Vec3f(0, 0, -1));
+  }
+
+  /** Takes normal vector and a point which the plane goes through
+      (which becomes the plane's "origin"). Normal does NOT have to be
+      normalized, but may not be zero vector. U and V axes are
+      initialized to arbitrary values. */
+  public PlaneUV(Vec3f normal, Vec3f origin) {
+    setOrigin(origin);
+    setNormal(normal);
+  }
+
+  /** Takes normal vector, point which plane goes through, and the "u"
+    axis in the plane. Computes the "v" axis by taking the cross
+    product of the normal and the u axis. Axis must be perpendicular
+    to normal. Normal and uAxis do NOT have to be normalized, but
+    neither may be the zero vector. */
+  public PlaneUV(Vec3f normal,
+                 Vec3f origin,
+                 Vec3f uAxis) {
+    setOrigin(origin);
+    setNormalAndU(normal, uAxis);
+  }
+
+  /** Takes normal vector, point which plane goes through, and both
+    the u and v axes. u axis cross v axis = normal. Normal, uAxis, and
+    vAxis do NOT have to be normalized, but none may be the zero
+    vector. */
+  public PlaneUV(Vec3f normal,
+                 Vec3f origin,
+                 Vec3f uAxis,
+                 Vec3f vAxis) {
+    setEverything(normal, origin, uAxis, vAxis);
+  }
+
+  /** Set the origin, through which this plane goes and with respect
+      to which U and V coordinates are computed */
+  public void setOrigin(Vec3f origin) {
+    this.origin.set(origin);
+  }
+
+  public Vec3f getOrigin() {
+    return new Vec3f(origin);
+  }
+
+  /** Normal, U and V axes must be orthogonal and satisfy U cross V =
+      normal, do not need to be unit length but must not be the zero
+      vector. */
+  public void setNormalAndUV(Vec3f normal,
+                             Vec3f uAxis,
+                             Vec3f vAxis) {
+    setEverything(normal, origin, uAxis, vAxis);
+  }
+
+  /** This version sets the normal vector and generates new U and V
+      axes. */
+  public void setNormal(Vec3f normal) {
+    Vec3f uAxis = new Vec3f();
+    MathUtil.makePerpendicular(normal, uAxis);
+    Vec3f vAxis = normal.cross(uAxis);
+    setEverything(normal, origin, uAxis, vAxis);
+  }
+
+  /** This version computes the V axis from (normal cross U). */
+  public void setNormalAndU(Vec3f normal,
+                            Vec3f uAxis) {
+    Vec3f vAxis = normal.cross(uAxis);
+    setEverything(normal, origin, uAxis, vAxis);
+  }
+
+  /** Normal, U and V axes are normalized internally, so, for example,
+      <b>normal</b> is not necessarily equal to
+      <code>plane.setNormal(normal); plane.getNormal();</code> */
+  public Vec3f getNormal() {
+    return normal;
+  }
+
+  public Vec3f getUAxis() {
+    return uAxis;
+  }
+
+  public Vec3f getVAxis() {
+    return vAxis;
+  }
+
+  /** Project a point onto the plane */
+  public void projectPoint(Vec3f point,
+                           Vec3f projPt,
+                           Vec2f uvCoords) {
+    // Using projPt as a temporary
+    projPt.sub(point, origin);
+    float dotp = normal.dot(projPt);
+    // Component perpendicular to plane
+    Vec3f tmpDir = new Vec3f();
+    tmpDir.set(normal);
+    tmpDir.scale(dotp);
+    projPt.sub(projPt, tmpDir);
+    // Take dot products with basis vectors
+    uvCoords.set(projPt.dot(uAxis),
+                 projPt.dot(vAxis));
+    // Add on center to intersection point
+    projPt.add(origin);
+  }
+
+  /** Intersect a ray with this plane, outputting not only the 3D
+      intersection point but also the U, V coordinates of the
+      intersection. Returns true if intersection occurred, false
+      otherwise. This is a two-sided ray cast. */
+  public boolean intersectRay(Vec3f rayStart,
+                              Vec3f rayDirection,
+                              IntersectionPoint intPt,
+                              Vec2f uvCoords) {
+    float denom = rayDirection.dot(normal);
+    if (denom == 0.0f)
+      return false;
+    Vec3f tmpDir = new Vec3f();
+    tmpDir.sub(origin, rayStart);
+    float t = tmpDir.dot(normal) / denom;
+    // Find intersection point
+    Vec3f tmpPt = new Vec3f();
+    tmpPt.set(rayDirection);
+    tmpPt.scale(t);
+    tmpPt.add(rayStart);
+    intPt.setIntersectionPoint(tmpPt);
+    intPt.setT(t);
+    // Find UV coords
+    tmpDir.sub(intPt.getIntersectionPoint(), origin);
+    uvCoords.set(tmpDir.dot(uAxis), tmpDir.dot(vAxis));
+    return true;
+  }
+
+  private void setEverything(Vec3f normal,
+                             Vec3f origin,
+                             Vec3f uAxis,
+                             Vec3f vAxis) {
+    this.normal.set(normal);
+    this.origin.set(origin);
+    this.uAxis.set(uAxis);
+    this.vAxis.set(vAxis);
+    this.normal.normalize();
+    this.uAxis.normalize();
+    this.vAxis.normalize();
+  }
+}
diff --git a/src/gleem/linalg/Rotf.java b/src/gleem/linalg/Rotf.java
new file mode 100644
index 0000000..4e39c21
--- /dev/null
+++ b/src/gleem/linalg/Rotf.java
@@ -0,0 +1,309 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem.linalg;
+
+/** Represents a rotation with single-precision components */
+
+public class Rotf {
+  private static float EPSILON = 1.0e-7f;
+
+  // Representation is a quaternion. Element 0 is the scalar part (=
+  // cos(theta/2)), elements 1..3 the imaginary/"vector" part (=
+  // sin(theta/2) * axis).
+  private float q0;
+  private float q1;
+  private float q2;
+  private float q3;
+
+  /** Default constructor initializes to the identity quaternion */
+  public Rotf() {
+    init();
+  }
+
+  public Rotf(Rotf arg) {
+    set(arg);
+  }
+
+  /** Axis does not need to be normalized but must not be the zero
+      vector. Angle is in radians. */
+  public Rotf(Vec3f axis, float angle) {
+    set(axis, angle);
+  }
+
+  /** Creates a rotation which will rotate vector "from" into vector
+      "to". */
+  public Rotf(Vec3f from, Vec3f to) {
+    set(from, to);
+  }
+
+  /** Re-initialize this quaternion to be the identity quaternion "e"
+      (i.e., no rotation) */
+  public void init() {
+    q0 = 1;
+    q1 = q2 = q3 = 0;
+  }
+
+  /** Test for "approximate equality" -- performs componentwise test
+      to see whether difference between all components is less than
+      epsilon. */
+  public boolean withinEpsilon(Rotf arg, float epsilon) {
+    return ((Math.abs(q0 - arg.q0) < epsilon) &&
+            (Math.abs(q1 - arg.q1) < epsilon) &&
+            (Math.abs(q2 - arg.q2) < epsilon) &&
+            (Math.abs(q3 - arg.q3) < epsilon));
+  }
+
+  /** Axis does not need to be normalized but must not be the zero
+      vector. Angle is in radians. */
+  public void set(Vec3f axis, float angle) {
+    float halfTheta = angle / 2.0f;
+    q0 = (float) Math.cos(halfTheta);
+    float sinHalfTheta = (float) Math.sin(halfTheta);
+    Vec3f realAxis = new Vec3f(axis);
+    realAxis.normalize();
+    q1 = realAxis.x() * sinHalfTheta;
+    q2 = realAxis.y() * sinHalfTheta;
+    q3 = realAxis.z() * sinHalfTheta;
+  }
+
+  public void set(Rotf arg) {
+    q0 = arg.q0;
+    q1 = arg.q1;
+    q2 = arg.q2;
+    q3 = arg.q3;
+  }
+
+  /** Sets this rotation to that which will rotate vector "from" into
+      vector "to". from and to do not have to be the same length. */
+  public void set(Vec3f from, Vec3f to) {
+    Vec3f axis = from.cross(to);
+    if (axis.lengthSquared() < EPSILON) {
+      init();
+      return;
+    }
+    float dotp = from.dot(to);
+    float denom = from.length() * to.length();
+    if (denom < EPSILON) {
+      init();
+      return;
+    }
+    dotp /= denom;
+    set(axis, (float) Math.acos(dotp));
+  }
+
+  /** Returns angle (in radians) and mutates the given vector to be
+      the axis. */
+  public float get(Vec3f axis) {
+    // FIXME: Is this numerically stable? Is there a better way to
+    // extract the angle from a quaternion?
+    // NOTE: remove (float) to illustrate compiler bug
+    float retval = (float) (2.0f * Math.acos(q0));
+    axis.set(q1, q2, q3);
+    float len = axis.length();
+    if (len == 0.0f) {
+      axis.set(0, 0, 1);
+    } else {
+      axis.scale(1.0f / len);
+    }
+    return retval;
+  }
+
+  /** Returns inverse of this rotation; creates new rotation */
+  public Rotf inverse() {
+    Rotf tmp = new Rotf(this);
+    tmp.invert();
+    return tmp;
+  }
+
+  /** Mutate this quaternion to be its inverse. This is equivalent to
+      the conjugate of the quaternion. */
+  public void invert() {
+    q1 = -q1;
+    q2 = -q2;
+    q3 = -q3;
+  }
+  
+  /** Length of this quaternion in four-space */
+  public float length() {
+    return (float) Math.sqrt(lengthSquared());
+  }
+
+  /** This dotted with this */
+  public float lengthSquared() {
+    return (q0 * q0 +
+            q1 * q1 +
+            q2 * q2 +
+            q3 * q3);
+  }
+
+  /** Make this quaternion a unit quaternion again. If you are
+      composing dozens of quaternions you probably should call this
+      periodically to ensure that you have a valid rotation. */
+  public void normalize() {
+    float len = length();
+    q0 /= len;
+    q1 /= len;
+    q2 /= len;
+    q3 /= len;
+  }
+
+  /** Returns this * b, in that order; creates new rotation */
+  public Rotf times(Rotf b) {
+    Rotf tmp = new Rotf();
+    tmp.mul(this, b);
+    return tmp;
+  }
+
+  /** Compose two rotations: this = A * B in that order. NOTE that
+      because we assume a column vector representation that this
+      implies that a vector rotated by the cumulative rotation will be
+      rotated first by B, then A. NOTE: "this" must be different than
+      both a and b. */
+  public void mul(Rotf a, Rotf b) {
+    q0 = (a.q0 * b.q0 - a.q1 * b.q1 -
+          a.q2 * b.q2 - a.q3 * b.q3);
+    q1 = (a.q0 * b.q1 + a.q1 * b.q0 +
+          a.q2 * b.q3 - a.q3 * b.q2);
+    q2 = (a.q0 * b.q2 + a.q2 * b.q0 -
+          a.q1 * b.q3 + a.q3 * b.q1);
+    q3 = (a.q0 * b.q3 + a.q3 * b.q0 +
+          a.q1 * b.q2 - a.q2 * b.q1);
+  }
+
+  /** Turns this rotation into a 3x3 rotation matrix. NOTE: only
+      mutates the upper-left 3x3 of the passed Mat4f. Implementation
+      from B. K. P. Horn's <u>Robot Vision</u> textbook. */
+  public void toMatrix(Mat4f mat) {
+    float q00 = q0 * q0;
+    float q11 = q1 * q1;
+    float q22 = q2 * q2;
+    float q33 = q3 * q3;
+    // Diagonal elements
+    mat.set(0, 0, q00 + q11 - q22 - q33);
+    mat.set(1, 1, q00 - q11 + q22 - q33);
+    mat.set(2, 2, q00 - q11 - q22 + q33);
+    // 0,1 and 1,0 elements
+    float q03 = q0 * q3;
+    float q12 = q1 * q2;
+    mat.set(0, 1, 2.0f * (q12 - q03));
+    mat.set(1, 0, 2.0f * (q03 + q12));
+    // 0,2 and 2,0 elements
+    float q02 = q0 * q2;
+    float q13 = q1 * q3;
+    mat.set(0, 2, 2.0f * (q02 + q13));
+    mat.set(2, 0, 2.0f * (q13 - q02));
+    // 1,2 and 2,1 elements
+    float q01 = q0 * q1;
+    float q23 = q2 * q3;
+    mat.set(1, 2, 2.0f * (q23 - q01));
+    mat.set(2, 1, 2.0f * (q01 + q23));
+  }
+
+  /** Turns the upper left 3x3 of the passed matrix into a rotation.
+      Implementation from Watt and Watt, <u>Advanced Animation and
+      Rendering Techniques</u>.
+      @see gleem.linalg.Mat4f#getRotation */
+  public void fromMatrix(Mat4f mat) {
+    // FIXME: Should reimplement to follow Horn's advice of using
+    // eigenvector decomposition to handle roundoff error in given
+    // matrix.
+    
+    float tr, s;
+    int i, j, k;
+  
+    tr = mat.get(0, 0) + mat.get(1, 1) + mat.get(2, 2);
+    if (tr > 0.0) {
+      s = (float) Math.sqrt(tr + 1.0f);
+      q0 = s * 0.5f;
+      s = 0.5f / s;
+      q1 = (mat.get(2, 1) - mat.get(1, 2)) * s;
+      q2 = (mat.get(0, 2) - mat.get(2, 0)) * s;
+      q3 = (mat.get(1, 0) - mat.get(0, 1)) * s;
+    } else {
+      i = 0;
+      if (mat.get(1, 1) > mat.get(0, 0))
+        i = 1;
+      if (mat.get(2, 2) > mat.get(i, i))
+        i = 2;
+      j = (i+1)%3;
+      k = (j+1)%3;
+      s = (float) Math.sqrt( (mat.get(i, i) - (mat.get(j, j) + mat.get(k, k))) + 1.0f);
+      setQ(i+1, s * 0.5f);
+      s = 0.5f / s;
+      q0 = (mat.get(k, j) - mat.get(j, k)) * s;
+      setQ(j+1, (mat.get(j, i) + mat.get(i, j)) * s);
+      setQ(k+1, (mat.get(k, i) + mat.get(i, k)) * s);
+    }
+  }
+
+  /** Rotate a vector by this quaternion. Implementation is from
+      Horn's <u>Robot Vision</u>. NOTE: src and dest must be different
+      vectors. */
+  public void rotateVector(Vec3f src, Vec3f dest) {
+    Vec3f qVec = new Vec3f(q1, q2, q3);
+    Vec3f qCrossX = qVec.cross(src);
+    Vec3f qCrossXCrossQ = qCrossX.cross(qVec);
+    qCrossX.scale(2.0f * q0);
+    qCrossXCrossQ.scale(-2.0f);
+    dest.add(src, qCrossX);
+    dest.add(dest, qCrossXCrossQ);
+  }
+
+  /** Rotate a vector by this quaternion, returning newly-allocated result. */
+  public Vec3f rotateVector(Vec3f src) {
+    Vec3f tmp = new Vec3f();
+    rotateVector(src, tmp);
+    return tmp;
+  }
+
+  public String toString() {
+    return "(" + q0 + ", " + q1 + ", " + q2 + ", " + q3 + ")";
+  }
+
+  private void setQ(int i, float val) {
+    switch (i) {
+    case 0: q0 = val; break;
+    case 1: q1 = val; break;
+    case 2: q2 = val; break;
+    case 3: q3 = val; break;
+    default: throw new IndexOutOfBoundsException();
+    }
+  }
+}
diff --git a/src/gleem/linalg/SingularMatrixException.java b/src/gleem/linalg/SingularMatrixException.java
new file mode 100644
index 0000000..fa6ef32
--- /dev/null
+++ b/src/gleem/linalg/SingularMatrixException.java
@@ -0,0 +1,53 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem.linalg;
+
+/** Thrown to indicate a singular matrix during an inversion or
+    related operation. */
+
+public class SingularMatrixException extends RuntimeException {
+  public SingularMatrixException() {
+    super();
+  }
+
+  public SingularMatrixException(String msg) {
+    super(msg);
+  }
+}
diff --git a/src/gleem/linalg/Vec2f.java b/src/gleem/linalg/Vec2f.java
new file mode 100644
index 0000000..2e02701
--- /dev/null
+++ b/src/gleem/linalg/Vec2f.java
@@ -0,0 +1,182 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem.linalg;
+
+/** 2-element single-precision vector */
+
+public class Vec2f {
+  private float x;
+  private float y;
+
+  public Vec2f() {}
+
+  public Vec2f(Vec2f arg) {
+    this(arg.x, arg.y);
+  }
+
+  public Vec2f(float x, float y) {
+    set(x, y);
+  }
+
+  public Vec2f copy() {
+    return new Vec2f(this);
+  }
+
+  public void set(float x, float y) {
+    this.x = x;
+    this.y = y;
+  }
+
+  /** Sets the ith component, 0 <= i < 2 */
+  public void set(int i, float val) {
+    switch (i) {
+    case 0: x = val; break;
+    case 1: y = val; break;
+    default: throw new IndexOutOfBoundsException();
+    }
+  }
+
+  /** Gets the ith component, 0 <= i < 2 */
+  public float get(int i) {
+    switch (i) {
+    case 0: return x;
+    case 1: return y;
+    default: throw new IndexOutOfBoundsException();
+    }
+  }
+
+  public float x() { return x; }
+  public float y() { return y; }
+
+  public void setX(float x) { this.x = x; }
+  public void setY(float y) { this.y = y; }
+
+  public float dot(Vec2f arg) {
+    return x * arg.x + y * arg.y;
+  }
+
+  public float length() {
+    return (float) Math.sqrt(lengthSquared());
+  }
+
+  public float lengthSquared() {
+    return this.dot(this);
+  }
+
+  public void normalize() {
+    float len = length();
+    if (len == 0.0f) return;
+    scale(1.0f / len);
+  }
+
+  /** Returns this * val; creates new vector */
+  public Vec2f times(float val) {
+    Vec2f tmp = new Vec2f(this);
+    tmp.scale(val);
+    return tmp;
+  }
+
+  /** this = this * val */
+  public void scale(float val) {
+    x *= val;
+    y *= val;
+  }
+
+  /** Returns this + arg; creates new vector */
+  public Vec2f plus(Vec2f arg) {
+    Vec2f tmp = new Vec2f();
+    tmp.add(this, arg);
+    return tmp;
+  }
+
+  /** this = this + b */
+  public void add(Vec2f b) {
+    add(this, b);
+  }
+
+  /** this = a + b */
+  public void add(Vec2f a, Vec2f b) {
+    x = a.x + b.x;
+    y = a.y + b.y;
+  }
+
+  /** Returns this + s * arg; creates new vector */
+  public Vec2f addScaled(float s, Vec2f arg) {
+    Vec2f tmp = new Vec2f();
+    tmp.addScaled(this, s, arg);
+    return tmp;
+  }
+
+  /** this = a + s * b */
+  public void addScaled(Vec2f a, float s, Vec2f b) {
+    x = a.x + s * b.x;
+    y = a.y + s * b.y;
+  }
+
+  /** Returns this - arg; creates new vector */
+  public Vec2f minus(Vec2f arg) {
+    Vec2f tmp = new Vec2f();
+    tmp.sub(this, arg);
+    return tmp;
+  }
+
+  /** this = this - b */
+  public void sub(Vec2f b) {
+    sub(this, b);
+  }
+
+  /** this = a - b */
+  public void sub(Vec2f a, Vec2f b) {
+    x = a.x - b.x;
+    y = a.y - b.y;
+  }
+
+  public Vecf toVecf() {
+    Vecf out = new Vecf(2);
+    for (int i = 0; i < 2; i++) {
+      out.set(i, get(i));
+    }
+    return out;
+  }
+
+  public String toString() {
+    return "(" + x + ", " + y + ")";
+  }
+}
diff --git a/src/gleem/linalg/Vec3d.java b/src/gleem/linalg/Vec3d.java
new file mode 100644
index 0000000..7a7a907
--- /dev/null
+++ b/src/gleem/linalg/Vec3d.java
@@ -0,0 +1,175 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ * See the file GLEEM-LICENSE.txt in the doc/ directory for licensing terms.
+ */
+
+package gleem.linalg;
+
+/** 3-element double-precision vector */
+
+public class Vec3d {
+  private double x;
+  private double y;
+  private double z;
+
+  public Vec3d() {}
+
+  public Vec3d(Vec3d arg) {
+    set(arg);
+  }
+
+  public Vec3d(double x, double y, double z) {
+    set(x, y, z);
+  }
+
+  public Vec3d copy() {
+    return new Vec3d(this);
+  }
+
+  /** Convert to single-precision */
+  public Vec3f toFloat() {
+    return new Vec3f((float) x, (float) y, (float) z);
+  }
+
+  public void set(Vec3d arg) {
+    set(arg.x, arg.y, arg.z);
+  }
+
+  public void set(double x, double y, double z) {
+    this.x = x;
+    this.y = y;
+    this.z = z;
+  }
+
+  /** Sets the ith component, 0 <= i < 3 */
+  public void set(int i, double val) {
+    switch (i) {
+    case 0: x = val; break;
+    case 1: y = val; break;
+    case 2: z = val; break;
+    default: throw new IndexOutOfBoundsException();
+    }
+  }
+
+  /** Gets the ith component, 0 <= i < 3 */
+  public double get(int i) {
+    switch (i) {
+    case 0: return x;
+    case 1: return y;
+    case 2: return z;
+    default: throw new IndexOutOfBoundsException();
+    }
+  }
+
+  public double x() { return x; }
+  public double y() { return y; }
+  public double z() { return z; }
+
+  public void setX(double x) { this.x = x; }
+  public void setY(double y) { this.y = y; }
+  public void setZ(double z) { this.z = z; }
+
+  public double dot(Vec3d arg) {
+    return x * arg.x + y * arg.y + z * arg.z;
+  }
+
+  public double length() {
+    return Math.sqrt(lengthSquared());
+  }
+
+  public double lengthSquared() {
+    return this.dot(this);
+  }
+
+  public void normalize() {
+    double len = length();
+    if (len == 0.0) return;
+    scale(1.0f / len);
+  }
+
+  /** Returns this * val; creates new vector */
+  public Vec3d times(double val) {
+    Vec3d tmp = new Vec3d(this);
+    tmp.scale(val);
+    return tmp;
+  }
+
+  /** this = this * val */
+  public void scale(double val) {
+    x *= val;
+    y *= val;
+    z *= val;
+  }
+
+  /** Returns this + arg; creates new vector */
+  public Vec3d plus(Vec3d arg) {
+    Vec3d tmp = new Vec3d();
+    tmp.add(this, arg);
+    return tmp;
+  }
+
+  /** this = this + b */
+  public void add(Vec3d b) {
+    add(this, b);
+  }
+
+  /** this = a + b */
+  public void add(Vec3d a, Vec3d b) {
+    x = a.x + b.x;
+    y = a.y + b.y;
+    z = a.z + b.z;
+  }
+
+  /** Returns this + s * arg; creates new vector */
+  public Vec3d addScaled(double s, Vec3d arg) {
+    Vec3d tmp = new Vec3d();
+    tmp.addScaled(this, s, arg);
+    return tmp;
+  }
+
+  /** this = a + s * b */
+  public void addScaled(Vec3d a, double s, Vec3d b) {
+    x = a.x + s * b.x;
+    y = a.y + s * b.y;
+    z = a.z + s * b.z;
+  }
+
+  /** Returns this - arg; creates new vector */
+  public Vec3d minus(Vec3d arg) {
+    Vec3d tmp = new Vec3d();
+    tmp.sub(this, arg);
+    return tmp;
+  }
+
+  /** this = this - b */
+  public void sub(Vec3d b) {
+    sub(this, b);
+  }
+
+  /** this = a - b */
+  public void sub(Vec3d a, Vec3d b) {
+    x = a.x - b.x;
+    y = a.y - b.y;
+    z = a.z - b.z;
+  }
+
+  /** Returns this cross arg; creates new vector */
+  public Vec3d cross(Vec3d arg) {
+    Vec3d tmp = new Vec3d();
+    tmp.cross(this, arg);
+    return tmp;
+  }
+
+  /** this = a cross b. NOTE: "this" must be a different vector than
+      both a and b. */
+  public void cross(Vec3d a, Vec3d b) {
+    x = a.y * b.z - a.z * b.y;
+    y = a.z * b.x - a.x * b.z;
+    z = a.x * b.y - a.y * b.x;
+  }
+
+  public String toString() {
+    return "(" + x + ", " + y + ", " + z + ")";
+  }
+}
diff --git a/src/gleem/linalg/Vec3f.java b/src/gleem/linalg/Vec3f.java
new file mode 100644
index 0000000..5468f3e
--- /dev/null
+++ b/src/gleem/linalg/Vec3f.java
@@ -0,0 +1,232 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem.linalg;
+
+/** 3-element single-precision vector */
+
+public class Vec3f {
+  public static final Vec3f X_AXIS     = new Vec3f( 1,  0,  0);
+  public static final Vec3f Y_AXIS     = new Vec3f( 0,  1,  0);
+  public static final Vec3f Z_AXIS     = new Vec3f( 0,  0,  1);
+  public static final Vec3f NEG_X_AXIS = new Vec3f(-1,  0,  0);
+  public static final Vec3f NEG_Y_AXIS = new Vec3f( 0, -1,  0);
+  public static final Vec3f NEG_Z_AXIS = new Vec3f( 0,  0, -1);
+
+  private float x;
+  private float y;
+  private float z;
+
+  public Vec3f() {}
+
+  public Vec3f(Vec3f arg) {
+    set(arg);
+  }
+
+  public Vec3f(float x, float y, float z) {
+    set(x, y, z);
+  }
+
+  public Vec3f copy() {
+    return new Vec3f(this);
+  }
+
+  /** Convert to double-precision */
+  public Vec3d toDouble() {
+    return new Vec3d(x, y, z);
+  }
+
+  public void set(Vec3f arg) {
+    set(arg.x, arg.y, arg.z);
+  }
+
+  public void set(float x, float y, float z) {
+    this.x = x;
+    this.y = y;
+    this.z = z;
+  }
+
+  /** Sets the ith component, 0 <= i < 3 */
+  public void set(int i, float val) {
+    switch (i) {
+    case 0: x = val; break;
+    case 1: y = val; break;
+    case 2: z = val; break;
+    default: throw new IndexOutOfBoundsException();
+    }
+  }
+
+  /** Gets the ith component, 0 <= i < 3 */
+  public float get(int i) {
+    switch (i) {
+    case 0: return x;
+    case 1: return y;
+    case 2: return z;
+    default: throw new IndexOutOfBoundsException();
+    }
+  }
+
+  public float x() { return x; }
+  public float y() { return y; }
+  public float z() { return z; }
+
+  public void setX(float x) { this.x = x; }
+  public void setY(float y) { this.y = y; }
+  public void setZ(float z) { this.z = z; }
+
+  public float dot(Vec3f arg) {
+    return x * arg.x + y * arg.y + z * arg.z;
+  }
+
+  public float length() {
+    return (float) Math.sqrt(lengthSquared());
+  }
+
+  public float lengthSquared() {
+    return this.dot(this);
+  }
+
+  public void normalize() {
+    float len = length();
+    if (len == 0.0f) return;
+    scale(1.0f / len);
+  }
+
+  /** Returns this * val; creates new vector */
+  public Vec3f times(float val) {
+    Vec3f tmp = new Vec3f(this);
+    tmp.scale(val);
+    return tmp;
+  }
+
+  /** this = this * val */
+  public void scale(float val) {
+    x *= val;
+    y *= val;
+    z *= val;
+  }
+
+  /** Returns this + arg; creates new vector */
+  public Vec3f plus(Vec3f arg) {
+    Vec3f tmp = new Vec3f();
+    tmp.add(this, arg);
+    return tmp;
+  }
+
+  /** this = this + b */
+  public void add(Vec3f b) {
+    add(this, b);
+  }
+
+  /** this = a + b */
+  public void add(Vec3f a, Vec3f b) {
+    x = a.x + b.x;
+    y = a.y + b.y;
+    z = a.z + b.z;
+  }
+
+  /** Returns this + s * arg; creates new vector */
+  public Vec3f addScaled(float s, Vec3f arg) {
+    Vec3f tmp = new Vec3f();
+    tmp.addScaled(this, s, arg);
+    return tmp;
+  }
+
+  /** this = a + s * b */
+  public void addScaled(Vec3f a, float s, Vec3f b) {
+    x = a.x + s * b.x;
+    y = a.y + s * b.y;
+    z = a.z + s * b.z;
+  }
+
+  /** Returns this - arg; creates new vector */
+  public Vec3f minus(Vec3f arg) {
+    Vec3f tmp = new Vec3f();
+    tmp.sub(this, arg);
+    return tmp;
+  }
+
+  /** this = this - b */
+  public void sub(Vec3f b) {
+    sub(this, b);
+  }
+
+  /** this = a - b */
+  public void sub(Vec3f a, Vec3f b) {
+    x = a.x - b.x;
+    y = a.y - b.y;
+    z = a.z - b.z;
+  }
+
+  /** Returns this cross arg; creates new vector */
+  public Vec3f cross(Vec3f arg) {
+    Vec3f tmp = new Vec3f();
+    tmp.cross(this, arg);
+    return tmp;
+  }
+
+  /** this = a cross b. NOTE: "this" must be a different vector than
+      both a and b. */
+  public void cross(Vec3f a, Vec3f b) {
+    x = a.y * b.z - a.z * b.y;
+    y = a.z * b.x - a.x * b.z;
+    z = a.x * b.y - a.y * b.x;
+  }
+
+  /** Sets each component of this vector to the product of the
+      component with the corresponding component of the argument
+      vector. */
+  public void componentMul(Vec3f arg) {
+    x *= arg.x;
+    y *= arg.y;
+    z *= arg.z;
+  }
+
+  public Vecf toVecf() {
+    Vecf out = new Vecf(3);
+    for (int i = 0; i < 3; i++) {
+      out.set(i, get(i));
+    }
+    return out;
+  }
+
+  public String toString() {
+    return "(" + x + ", " + y + ", " + z + ")";
+  }
+}
diff --git a/src/gleem/linalg/Vec4f.java b/src/gleem/linalg/Vec4f.java
new file mode 100644
index 0000000..bfb53ab
--- /dev/null
+++ b/src/gleem/linalg/Vec4f.java
@@ -0,0 +1,216 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem.linalg;
+
+/** 4-element single-precision vector */
+
+public class Vec4f {
+  private float x;
+  private float y;
+  private float z;
+  private float w;
+
+  public Vec4f() {}
+
+  public Vec4f(Vec4f arg) {
+    set(arg);
+  }
+
+  public Vec4f(float x, float y, float z, float w) {
+    set(x, y, z, w);
+  }
+
+  public Vec4f copy() {
+    return new Vec4f(this);
+  }
+
+  public void set(Vec4f arg) {
+    set(arg.x, arg.y, arg.z, arg.w);
+  }
+
+  public void set(float x, float y, float z, float w) {
+    this.x = x;
+    this.y = y;
+    this.z = z;
+    this.w = w;
+  }
+
+  /** Sets the ith component, 0 <= i < 4 */
+  public void set(int i, float val) {
+    switch (i) {
+    case 0: x = val; break;
+    case 1: y = val; break;
+    case 2: z = val; break;
+    case 3: w = val; break;
+    default: throw new IndexOutOfBoundsException();
+    }
+  }
+
+  /** Gets the ith component, 0 <= i < 4 */
+  public float get(int i) {
+    switch (i) {
+    case 0: return x;
+    case 1: return y;
+    case 2: return z;
+    case 3: return w;
+    default: throw new IndexOutOfBoundsException();
+    }
+  }
+
+  public float x() { return x; }
+  public float y() { return y; }
+  public float z() { return z; }
+  public float w() { return w; }
+
+  public void setX(float x) { this.x = x; }
+  public void setY(float y) { this.y = y; }
+  public void setZ(float z) { this.z = z; }
+  public void setW(float w) { this.w = w; }
+
+  public float dot(Vec4f arg) {
+    return x * arg.x + y * arg.y + z * arg.z + w * arg.w;
+  }
+
+  public float length() {
+    return (float) Math.sqrt(lengthSquared());
+  }
+
+  public float lengthSquared() {
+    return this.dot(this);
+  }
+
+  public void normalize() {
+    float len = length();
+    if (len == 0.0f) return;
+    scale(1.0f / len);
+  }
+
+  /** Returns this * val; creates new vector */
+  public Vec4f times(float val) {
+    Vec4f tmp = new Vec4f(this);
+    tmp.scale(val);
+    return tmp;
+  }
+
+  /** this = this * val */
+  public void scale(float val) {
+    x *= val;
+    y *= val;
+    z *= val;
+    w *= val;
+  }
+
+  /** Returns this + arg; creates new vector */
+  public Vec4f plus(Vec4f arg) {
+    Vec4f tmp = new Vec4f();
+    tmp.add(this, arg);
+    return tmp;
+  }
+
+  /** this = this + b */
+  public void add(Vec4f b) {
+    add(this, b);
+  }
+
+  /** this = a + b */
+  public void add(Vec4f a, Vec4f b) {
+    x = a.x + b.x;
+    y = a.y + b.y;
+    z = a.z + b.z;
+    w = a.w + b.w;
+  }
+
+  /** Returns this + s * arg; creates new vector */
+  public Vec4f addScaled(float s, Vec4f arg) {
+    Vec4f tmp = new Vec4f();
+    tmp.addScaled(this, s, arg);
+    return tmp;
+  }
+
+  /** this = a + s * b */
+  public void addScaled(Vec4f a, float s, Vec4f b) {
+    x = a.x + s * b.x;
+    y = a.y + s * b.y;
+    z = a.z + s * b.z;
+    w = a.w + s * b.w;
+  }
+
+  /** Returns this - arg; creates new vector */
+  public Vec4f minus(Vec4f arg) {
+    Vec4f tmp = new Vec4f();
+    tmp.sub(this, arg);
+    return tmp;
+  }
+
+  /** this = this - b */
+  public void sub(Vec4f b) {
+    sub(this, b);
+  }
+
+  /** this = a - b */
+  public void sub(Vec4f a, Vec4f b) {
+    x = a.x - b.x;
+    y = a.y - b.y;
+    z = a.z - b.z;
+    w = a.w - b.w;
+  }
+
+  /** Sets each component of this vector to the product of the
+      component with the corresponding component of the argument
+      vector. */
+  public void componentMul(Vec4f arg) {
+    x *= arg.x;
+    y *= arg.y;
+    z *= arg.z;
+    w *= arg.w;
+  }
+
+  public Vecf toVecf() {
+    Vecf out = new Vecf(4);
+    for (int i = 0; i < 4; i++) {
+      out.set(i, get(i));
+    }
+    return out;
+  }
+
+  public String toString() {
+    return "(" + x + ", " + y + ", " + z + ")";
+  }
+}
diff --git a/src/gleem/linalg/Vecf.java b/src/gleem/linalg/Vecf.java
new file mode 100644
index 0000000..1249695
--- /dev/null
+++ b/src/gleem/linalg/Vecf.java
@@ -0,0 +1,96 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem.linalg;
+
+/** Arbitrary-length single-precision vector class. Currently very
+    simple and only supports a few needed operations. */
+
+public class Vecf {
+  private float[] data;
+
+  public Vecf(int n) {
+    data = new float[n];
+  }
+
+  public Vecf(Vecf arg) {
+    data = new float[arg.data.length];
+    System.arraycopy(arg.data, 0, data, 0, data.length);
+  }
+
+  public int length() {
+    return data.length;
+  }
+
+  public float get(int i) {
+    return data[i];
+  }
+
+  public void set(int i, float val) {
+    data[i] = val;
+  }
+
+  public Vec2f toVec2f() throws DimensionMismatchException {
+    if (length() != 2)
+      throw new DimensionMismatchException();
+    Vec2f out = new Vec2f();
+    for (int i = 0; i < 2; i++) {
+      out.set(i, get(i));
+    }
+    return out;
+  }
+
+  public Vec3f toVec3f() throws DimensionMismatchException {
+    if (length() != 3)
+      throw new DimensionMismatchException();
+    Vec3f out = new Vec3f();
+    for (int i = 0; i < 3; i++) {
+      out.set(i, get(i));
+    }
+    return out;
+  }
+
+  public Veci toInt() {
+    Veci out = new Veci(length());
+    for (int i = 0; i < length(); i++) {
+      out.set(i, (int) get(i));
+    }
+    return out;
+  }
+}
diff --git a/src/gleem/linalg/Veci.java b/src/gleem/linalg/Veci.java
new file mode 100644
index 0000000..d7705e7
--- /dev/null
+++ b/src/gleem/linalg/Veci.java
@@ -0,0 +1,96 @@
+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem.linalg;
+
+/** Arbitrary-length integer vector class. Currently very simple and
+    only supports a few needed operations. */
+
+public class Veci {
+  private int[] data;
+
+  public Veci(int n) {
+    data = new int[n];
+  }
+
+  public Veci(Veci arg) {
+    data = new int[arg.data.length];
+    System.arraycopy(arg.data, 0, data, 0, data.length);
+  }
+
+  public int length() {
+    return data.length;
+  }
+
+  public int get(int i) {
+    return data[i];
+  }
+
+  public void set(int i, int val) {
+    data[i] = val;
+  }
+
+  public Vec2f toVec2f() throws DimensionMismatchException {
+    if (length() != 2)
+      throw new DimensionMismatchException();
+    Vec2f out = new Vec2f();
+    for (int i = 0; i < 2; i++) {
+      out.set(i, get(i));
+    }
+    return out;
+  }
+
+  public Vec3f toVec3f() throws DimensionMismatchException {
+    if (length() != 3)
+      throw new DimensionMismatchException();
+    Vec3f out = new Vec3f();
+    for (int i = 0; i < 3; i++) {
+      out.set(i, get(i));
+    }
+    return out;
+  }
+
+  public Vecf toVecf() {
+    Vecf out = new Vecf(length());
+    for (int i = 0; i < length(); i++) {
+      out.set(i, get(i));
+    }
+    return out;
+  }
+}
diff --git a/src/gleem/linalg/package.html b/src/gleem/linalg/package.html
new file mode 100644
index 0000000..bc1e60f
--- /dev/null
+++ b/src/gleem/linalg/package.html
@@ -0,0 +1,13 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
+<html>
+<body>
+
+Linear algebra and classes implementing basic 3D operations.
+
+<P>
+
+See the <a href = "http://www.media.mit.edu/~kbrussel/gleem/"> gleem
+home page </a> for more information.
+
+</body>
+</html>
diff --git a/src/gleem/package.html b/src/gleem/package.html
new file mode 100644
index 0000000..2dc6d32
--- /dev/null
+++ b/src/gleem/package.html
@@ -0,0 +1,13 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
+<html>
+<body>
+
+Widgets and auxiliary classes for interaction with a 3D scene.
+
+<P>
+
+See the <a href = "http://www.media.mit.edu/~kbrussel/gleem/"> gleem
+home page </a> for more information.
+
+</body>
+</html>