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diff --git a/src/gleem/Translate2Manip.java b/src/gleem/Translate2Manip.java
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--- a/src/gleem/Translate2Manip.java
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-/*
- * 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 javax.media.opengl.*;
-
-/** 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);
-  }
-}