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diff --git a/src/demos/xtrans/XTBasicTransition.java b/src/demos/xtrans/XTBasicTransition.java
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+++ b/src/demos/xtrans/XTBasicTransition.java
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+package demos.xtrans;
+
+import javax.media.opengl.*;
+import gleem.linalg.*;
+
+/** A basic transition supporting animated translation, rotation about
+    a pivot point, scrolling and fading effects. */
+
+public class XTBasicTransition implements XTTransition {
+  protected Vec3f              pivot       = new Vec3f();
+  protected Vec3f              axis        = new Vec3f();
+  protected InterpolatedFloat  angle;
+  protected InterpolatedVec3f  translation;
+  protected InterpolatedQuad3f vertices;
+  protected InterpolatedQuad2f texcoords;
+  protected InterpolatedFloat  alpha;
+  protected float              percentage;
+
+  /** Constructs a new transition object with all of its initial state
+      set to zero. */
+  public XTBasicTransition() {
+  }
+
+  public void update(float percentage) {
+    this.percentage = percentage;
+  }
+
+  public void draw(GL gl) {
+    float  percent = percentage;
+    Quad3f vts     = vertices.getCurrent(percent);
+    Quad2f tex     = texcoords.getCurrent(percent);
+
+    if (translation != null) {
+      Vec3f  trans   = translation.getCurrent(percent);
+      gl.glTranslatef(trans.x(), trans.y(), trans.z());
+    }
+    // Rotate about pivot point
+    gl.glTranslatef(pivot.x(), pivot.y(), pivot.z());
+    if (angle != null) {
+      gl.glRotatef(angle.getCurrent(percent), axis.x(), axis.y(), axis.z());
+    }
+    gl.glTranslatef(-pivot.x(), -pivot.y(), -pivot.z());
+
+    gl.glBegin(GL.GL_TRIANGLES);
+    float a = 1.0f;
+    if (alpha != null) {
+      a = alpha.getCurrent(percent);
+    }
+    gl.glColor4f(1, 1, 1, a);
+    // Triangle 1
+    gl.glTexCoord2f(tex.getVec(0).x(), tex.getVec(0).y());
+    gl.glVertex3f  (vts.getVec(0).x(), vts.getVec(0).y(), vts.getVec(0).z());
+    gl.glTexCoord2f(tex.getVec(1).x(), tex.getVec(1).y());
+    gl.glVertex3f  (vts.getVec(1).x(), vts.getVec(1).y(), vts.getVec(1).z());
+    gl.glTexCoord2f(tex.getVec(3).x(), tex.getVec(3).y());
+    gl.glVertex3f  (vts.getVec(3).x(), vts.getVec(3).y(), vts.getVec(3).z());
+    // Triangle 2
+    gl.glTexCoord2f(tex.getVec(3).x(), tex.getVec(3).y());
+    gl.glVertex3f  (vts.getVec(3).x(), vts.getVec(3).y(), vts.getVec(3).z());
+    gl.glTexCoord2f(tex.getVec(1).x(), tex.getVec(1).y());
+    gl.glVertex3f  (vts.getVec(1).x(), vts.getVec(1).y(), vts.getVec(1).z());
+    gl.glTexCoord2f(tex.getVec(2).x(), tex.getVec(2).y());
+    gl.glVertex3f  (vts.getVec(2).x(), vts.getVec(2).y(), vts.getVec(2).z());
+    gl.glEnd();
+  }
+
+  /** Returns the rotation axis for this transition. By default this
+      axis is not set, so if an interpolator is specified for the
+      rotation angle the axis of rotation must be specified as
+      well. */
+  public Vec3f             getRotationAxis() { return axis; }
+
+  /** Sets the rotation axis for this transition. By default this axis
+      is not set, so if an interpolator is specified for the rotation
+      angle the axis of rotation must be specified as well. */
+  public void              setRotationAxis(Vec3f axis) { this.axis.set(axis); }
+
+  /** Returns the interpolator for the rotation angle for this
+      transition. By default this interpolator is null, meaning that
+      the transition does not perform any rotation. */
+  public InterpolatedFloat getRotationAngle() { return angle; }
+
+  /** Sets the interpolator for the rotation angle for this
+      transition. By default this interpolator is null, meaning that
+      the transition does not perform any rotation. */
+  public void              setRotationAngle(InterpolatedFloat angle) { this.angle = angle; }
+
+  /** Returns the pivot point for this transition's rotation. By
+      default this is set to the origin, which corresponds to the
+      upper-left corner of the component being animated. */
+  public Vec3f getPivotPoint() { return pivot; }
+
+  /** Sets the pivot point for this transition's rotation. By default
+      this is set to the origin, which corresponds to the upper-left
+      corner of the component being animated. */
+  public void  setPivotPoint(Vec3f point) { pivot.set(point); }
+
+  /** Returns the interpolator for this transition's translation. By
+      default the translation is a fixed vector from the origin to the
+      upper left corner of the component being animated; the vertices
+      are specified relative to that point in the +x and -y
+      directions. */
+  public InterpolatedVec3f getTranslation() { return translation; }
+
+  /** Sets the interpolator for this transition's translation. By
+      default the translation is a fixed vector from the origin to the
+      upper left corner of the component being animated; the vertices
+      are specified relative to that point in the +x and -y
+      directions. */
+  public void              setTranslation(InterpolatedVec3f interp) { translation = interp; }
+
+  /** Returns the interpolator for the vertices of this transition's
+      component when drawn on screen. By default the vertices are
+      specified with the upper-left corner of the component at the
+      origin and the component extending in the +x (right) and -y
+      (down) directions; the units of the vertices correspond to the
+      on-screen size of the component in pixels. The component's
+      location is specified using the translation interpolator. */
+  public InterpolatedQuad3f getVertices() { return vertices; }
+
+  /** Sets the interpolator for the vertices of this transition's
+      component when drawn on screen. By default the vertices are
+      specified with the upper-left corner of the component at the
+      origin and the component extending in the +x (right) and -y
+      (down) directions; the units of the vertices correspond to the
+      on-screen size of the component in pixels. The component's
+      location is specified using the translation interpolator. */
+  public void               setVertices(InterpolatedQuad3f interp) { vertices = interp; }
+
+  /** Returns the interpolator for the texture coordinates of this
+      transition's component when drawn on screen. By default these
+      are set so that at either the start or end point (depending on
+      whether this is an "in" or "out" transition) the texture
+      coordinates specify rendering of the component's entire
+      contents. */
+  public InterpolatedQuad2f getTexCoords() { return texcoords; }
+
+  /** Sets the interpolator for the texture coordinates of this
+      transition's component when drawn on screen. By default these
+      are set so that at either the start or end point (depending on
+      whether this is an "in" or "out" transition) the texture
+      coordinates specify rendering of the component's entire
+      contents. */
+  public void               setTexCoords(InterpolatedQuad2f interp) { texcoords = interp; }
+
+  /** Returns the interpolator for this component's alpha value. */
+  public InterpolatedFloat  getAlpha() { return alpha; }
+
+  /** Sets the interpolator for this component's alpha value. */
+  public void               setAlpha(InterpolatedFloat interp) { alpha = interp; }
+}