Java/3D/Interpolator

A range of Interpolators and switches between

/**********************************************************
 Copyright (C) 2001   Daniel Selman
 First distributed with the book "Java 3D Programming"
 by Daniel Selman and published by Manning Publications.
 http://manning.ru/selman
 This program is free software; you can redistribute it and/or
 modify it under the terms of the GNU General Public License
 as published by the Free Software Foundation, version 2.
 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.
 The license can be found on the WWW at:
 http://www.fsf.org/copyleft/gpl.html
 Or by writing to:
 Free Software Foundation, Inc.,
 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 Authors can be contacted at:
 Daniel Selman: daniel@selman.org
 If you make changes you think others would like, please 
 contact one of the authors or someone at the 
 www.j3d.org web site.
 **************************************************************/
import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.Font;
import java.awt.GraphicsConfigTemplate;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.io.File;
import java.net.URL;
import javax.media.j3d.Alpha;
import javax.media.j3d.AmbientLight;
import javax.media.j3d.Appearance;
import javax.media.j3d.AudioDevice;
import javax.media.j3d.Background;
import javax.media.j3d.BoundingSphere;
import javax.media.j3d.Bounds;
import javax.media.j3d.BranchGroup;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.ColorInterpolator;
import javax.media.j3d.DirectionalLight;
import javax.media.j3d.GraphicsConfigTemplate3D;
import javax.media.j3d.Group;
import javax.media.j3d.Interpolator;
import javax.media.j3d.Locale;
import javax.media.j3d.Material;
import javax.media.j3d.PhysicalBody;
import javax.media.j3d.PhysicalEnvironment;
import javax.media.j3d.PositionInterpolator;
import javax.media.j3d.RotPosScalePathInterpolator;
import javax.media.j3d.RotationInterpolator;
import javax.media.j3d.ScaleInterpolator;
import javax.media.j3d.Switch;
import javax.media.j3d.SwitchValueInterpolator;
import javax.media.j3d.Transform3D;
import javax.media.j3d.TransformGroup;
import javax.media.j3d.TransparencyAttributes;
import javax.media.j3d.TransparencyInterpolator;
import javax.media.j3d.View;
import javax.media.j3d.ViewPlatform;
import javax.media.j3d.VirtualUniverse;
import javax.vecmath.Color3f;
import javax.vecmath.Point3d;
import javax.vecmath.Point3f;
import javax.vecmath.Quat4f;
import javax.vecmath.Vector3d;
import javax.vecmath.Vector3f;
import com.sun.j3d.audioengines.javasound.JavaSoundMixer;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.geometry.Primitive;
import com.sun.j3d.utils.geometry.Sphere;
import com.sun.j3d.utils.geometry.Text2D;
/**
 * This example creates a range of Interpolators and switches between them using
 * a SwitchInterpolator
 */
public class InterpolatorTest extends Java3dApplet {
  private static int m_kWidth = 400;
  private static int m_kHeight = 400;
  public InterpolatorTest() {
    initJava3d();
  }
  // scale eveything up so that moving from 0 to 1
  // is significant
  protected double getScale() {
    return 10.0;
  }
  // we want a black background
  protected Background createBackground() {
    return null;
  }
  protected BranchGroup createSceneBranchGroup() {
    BranchGroup objRoot = super.createSceneBranchGroup();
    // create a root TG in case we need to scale the scene
    TransformGroup objTrans = new TransformGroup();
    objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
    objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
    // create the Appearance for the Shape3D
    Appearance app = new Appearance();
    // create a Material, modified by the ColorInterpolator
    Color3f objColor = new Color3f(1.0f, 0.7f, 0.8f);
    Color3f black = new Color3f(0.0f, 0.0f, 0.0f);
    Material mat = new Material(objColor, black, objColor, black, 80.0f);
    mat.setCapability(Material.ALLOW_COMPONENT_WRITE);
    app.setMaterial(mat);
    // create a TransparencyAttributes, modified by the
    // TransparencyInterpolator
    TransparencyAttributes transparency = new TransparencyAttributes();
    transparency.setCapability(TransparencyAttributes.ALLOW_VALUE_WRITE);
    transparency.setTransparencyMode(TransparencyAttributes.NICEST);
    app.setTransparencyAttributes(transparency);
    // create a Switch Node and set capabilities
    Switch switchNode = new Switch();
    switchNode.setCapability(Switch.ALLOW_SWITCH_WRITE);
    // create a Alpha object for the Interpolators
    Alpha alpha = new Alpha(-1, Alpha.INCREASING_ENABLE
        | Alpha.DECREASING_ENABLE, 500, 100, 5000, 2000, 1000, 5000,
        2000, 500);
    // add each BG and Interpolator as a child of the Switch Node
    TransformGroup tg = createSharedGroup(app);
    switchNode.addChild(createBranchGroup(tg, new ColorInterpolator(alpha,
        app.getMaterial())));
    tg = createSharedGroup(app);
    switchNode.addChild(createBranchGroup(tg, new PositionInterpolator(
        alpha, tg)));
    tg = createSharedGroup(app);
    switchNode.addChild(createBranchGroup(tg, new RotationInterpolator(
        alpha, tg)));
    tg = createSharedGroup(app);
    switchNode.addChild(createBranchGroup(tg, new ScaleInterpolator(alpha,
        tg)));
    tg = createSharedGroup(app);
    switchNode.addChild(createBranchGroup(tg, new TransparencyInterpolator(
        alpha, app.getTransparencyAttributes(), 0, 0.8f)));
    // define the data for the RotPosScalePathInterpolator
    float[] knots = { 0.0f, 0.1f, 0.2f, 0.3f, 0.4f, 0.6f, 0.8f, 0.9f, 1.0f };
    float[] scales = { 0.2f, 0.5f, 0.8f, 2.3f, 5.4f, 0.6f, 0.4f, 0.2f, 0.1f };
    Quat4f[] quats = new Quat4f[9];
    Point3f[] positions = new Point3f[9];
    quats[0] = new Quat4f(0.3f, 1.0f, 1.0f, 0.0f);
    quats[1] = new Quat4f(1.0f, 0.0f, 0.0f, 0.3f);
    quats[2] = new Quat4f(0.2f, 1.0f, 0.0f, 0.0f);
    quats[3] = new Quat4f(0.0f, 0.2f, 1.0f, 0.0f);
    quats[4] = new Quat4f(1.0f, 0.0f, 0.4f, 0.0f);
    quats[5] = new Quat4f(0.0f, 1.0f, 1.0f, 0.2f);
    quats[6] = new Quat4f(0.3f, 0.3f, 0.0f, 0.0f);
    quats[7] = new Quat4f(1.0f, 0.0f, 1.0f, 1.0f);
    quats[8] = quats[0];
    positions[0] = new Point3f(0.0f, 0.0f, -1.0f);
    positions[1] = new Point3f(1.0f, -2.0f, -2.0f);
    positions[2] = new Point3f(-2.0f, 2.0f, -3.0f);
    positions[3] = new Point3f(1.0f, 1.0f, -4.0f);
    positions[4] = new Point3f(-4.0f, -2.0f, -5.0f);
    positions[5] = new Point3f(2.0f, 0.3f, -6.0f);
    positions[6] = new Point3f(-4.0f, 0.5f, -7.0f);
    positions[7] = new Point3f(0.0f, -1.5f, -4.0f);
    positions[8] = positions[0];
    tg = createSharedGroup(app);
    // create the Interpolator
    RotPosScalePathInterpolator rotPosScalePathInterplator = new RotPosScalePathInterpolator(
        alpha, tg, new Transform3D(), knots, quats, positions, scales);
    // add a BG for the Interpolator
    switchNode.addChild(createBranchGroup(tg, rotPosScalePathInterplator));
    // create a RandomAlpha object to control a SwitchInterpolator
    // to set the Switches active child node randomly
    RandomAlpha randomAlpha = new RandomAlpha();
    // create the interpolator
    SwitchValueInterpolator switchInterpolator = new SwitchValueInterpolator(
        randomAlpha, switchNode);
    switchInterpolator.setSchedulingBounds(getApplicationBounds());
    // connect the scenegraph
    objTrans.addChild(switchNode);
    objTrans.addChild(switchInterpolator);
    // Set up the global lights
    Color3f lColor1 = new Color3f(0.7f, 0.7f, 0.7f);
    Vector3f lDir1 = new Vector3f(-1.0f, -1.0f, -1.0f);
    Color3f alColor = new Color3f(0.2f, 0.2f, 0.2f);
    AmbientLight aLgt = new AmbientLight(alColor);
    aLgt.setInfluencingBounds(getApplicationBounds());
    DirectionalLight lgt1 = new DirectionalLight(lColor1, lDir1);
    lgt1.setInfluencingBounds(getApplicationBounds());
    // add the lights
    objRoot.addChild(aLgt);
    objRoot.addChild(lgt1);
    // connect
    objRoot.addChild(objTrans);
    return objRoot;
  }
  // creates a BG containing:
  //  - a Link to the SharedGroup
  //  - The Interpolator
  //  - a Text2D label of the name of the Interpolator
  private BranchGroup createBranchGroup(TransformGroup bgShared,
      Interpolator interpolator) {
    BranchGroup bg = new BranchGroup();
    bg.addChild(bgShared);
    bg.addChild(interpolator);
    interpolator.setSchedulingBounds(getApplicationBounds());
    // strip the package name from szClass (everything before the final ".")
    String szClass = interpolator.getClass().getName();
    int nIndex = szClass.lastIndexOf(".");
    String szTrimedClass = szClass;
    if (nIndex > -1)
      szTrimedClass = szClass.substring(nIndex + 1, szClass.length());
    Text2D text = new Text2D(szTrimedClass, new Color3f(1, 1, 1),
        "SansSerif", 20, Font.PLAIN);
    bg.addChild(text);
    return bg;
  }
  // create a SharedGroup and populate with some child nodes
  private TransformGroup createSharedGroup(Appearance app) {
    TransformGroup tg = new TransformGroup();
    tg.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
    tg.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
    tg.addChild(createGeometry(app, -0.5, -0.5, 0));
    tg.addChild(createGeometry(app, -0.5, 0.5, 0));
    tg.addChild(createGeometry(app, 0.5, 0.5, 0));
    tg.addChild(createGeometry(app, 0.5, -0.5, 0));
    return tg;
  }
  // create and position a Sphere using a parent TransformGroup
  TransformGroup createGeometry(Appearance app, double x, double y, double z) {
    Transform3D t3d = new Transform3D();
    t3d.setTranslation(new Vector3d(x, y, z));
    TransformGroup tg = new TransformGroup(t3d);
    tg.addChild(new Sphere(0.1f, Primitive.GENERATE_NORMALS, app));
    return tg;
  }
  public static void main(String[] args) {
    InterpolatorTest interpolatorTest = new InterpolatorTest();
    interpolatorTest.saveCommandLineArguments(args);
    new MainFrame(interpolatorTest, m_kWidth, m_kHeight);
  }
}
//this class defines an Alpha class that returns a random
//value every N milliseconds.
class RandomAlpha extends Alpha {
  protected long m_LastQueryTime = 0;
  protected float m_Alpha = 0;
  protected final int m_kUpdateInterval = 10000;
  public RandomAlpha() {
  }
  // core method override
  // returns the Alpha value for a given time
  public float value(long time) {
    if (System.currentTimeMillis() - m_LastQueryTime > m_kUpdateInterval) {
      m_LastQueryTime = System.currentTimeMillis();
      m_Alpha = (float) Math.random();
    }
    return m_Alpha;
  }
}
/*******************************************************************************
 * Copyright (C) 2001 Daniel Selman
 * 
 * First distributed with the book "Java 3D Programming" by Daniel Selman and
 * published by Manning Publications. http://manning.ru/selman
 * 
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation, version 2.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 * 
 * The license can be found on the WWW at: http://www.fsf.org/copyleft/gpl.html
 * 
 * Or by writing to: Free Software Foundation, Inc., 59 Temple Place - Suite
 * 330, Boston, MA 02111-1307, USA.
 * 
 * Authors can be contacted at: Daniel Selman: daniel@selman.org
 * 
 * If you make changes you think others would like, please contact one of the
 * authors or someone at the www.j3d.org web site.
 ******************************************************************************/
//*****************************************************************************
/**
 * Java3dApplet
 * 
 * Base class for defining a Java 3D applet. Contains some useful methods for
 * defining views and scenegraphs etc.
 * 
 * @author Daniel Selman
 * @version 1.0
 */
//*****************************************************************************
abstract class Java3dApplet extends Applet {
  public static int m_kWidth = 300;
  public static int m_kHeight = 300;
  protected String[] m_szCommandLineArray = null;
  protected VirtualUniverse m_Universe = null;
  protected BranchGroup m_SceneBranchGroup = null;
  protected Bounds m_ApplicationBounds = null;
  //  protected com.tornadolabs.j3dtree.Java3dTree m_Java3dTree = null;
  public Java3dApplet() {
  }
  public boolean isApplet() {
    try {
      System.getProperty("user.dir");
      System.out.println("Running as Application.");
      return false;
    } catch (Exception e) {
    }
    System.out.println("Running as Applet.");
    return true;
  }
  public URL getWorkingDirectory() throws java.net.MalformedURLException {
    URL url = null;
    try {
      File file = new File(System.getProperty("user.dir"));
      System.out.println("Running as Application:");
      System.out.println("   " + file.toURL());
      return file.toURL();
    } catch (Exception e) {
    }
    System.out.println("Running as Applet:");
    System.out.println("   " + getCodeBase());
    return getCodeBase();
  }
  public VirtualUniverse getVirtualUniverse() {
    return m_Universe;
  }
  //public com.tornadolabs.j3dtree.Java3dTree getJ3dTree() {
  //return m_Java3dTree;
  //  }
  public Locale getFirstLocale() {
    java.util.Enumeration e = m_Universe.getAllLocales();
    if (e.hasMoreElements() != false)
      return (Locale) e.nextElement();
    return null;
  }
  protected Bounds getApplicationBounds() {
    if (m_ApplicationBounds == null)
      m_ApplicationBounds = createApplicationBounds();
    return m_ApplicationBounds;
  }
  protected Bounds createApplicationBounds() {
    m_ApplicationBounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0),
        100.0);
    return m_ApplicationBounds;
  }
  protected Background createBackground() {
    Background back = new Background(new Color3f(0.9f, 0.9f, 0.9f));
    back.setApplicationBounds(createApplicationBounds());
    return back;
  }
  public void initJava3d() {
    //  m_Java3dTree = new com.tornadolabs.j3dtree.Java3dTree();
    m_Universe = createVirtualUniverse();
    Locale locale = createLocale(m_Universe);
    BranchGroup sceneBranchGroup = createSceneBranchGroup();
    ViewPlatform vp = createViewPlatform();
    BranchGroup viewBranchGroup = createViewBranchGroup(
        getViewTransformGroupArray(), vp);
    createView(vp);
    Background background = createBackground();
    if (background != null)
      sceneBranchGroup.addChild(background);
    //    m_Java3dTree.recursiveApplyCapability(sceneBranchGroup);
    //  m_Java3dTree.recursiveApplyCapability(viewBranchGroup);
    locale.addBranchGraph(sceneBranchGroup);
    addViewBranchGroup(locale, viewBranchGroup);
    onDoneInit();
  }
  protected void onDoneInit() {
    //  m_Java3dTree.updateNodes(m_Universe);
  }
  protected double getScale() {
    return 1.0;
  }
  public TransformGroup[] getViewTransformGroupArray() {
    TransformGroup[] tgArray = new TransformGroup[1];
    tgArray[0] = new TransformGroup();
    // move the camera BACK a little...
    // note that we have to invert the matrix as
    // we are moving the viewer
    Transform3D t3d = new Transform3D();
    t3d.setScale(getScale());
    t3d.setTranslation(new Vector3d(0.0, 0.0, -20.0));
    t3d.invert();
    tgArray[0].setTransform(t3d);
    return tgArray;
  }
  protected void addViewBranchGroup(Locale locale, BranchGroup bg) {
    locale.addBranchGraph(bg);
  }
  protected Locale createLocale(VirtualUniverse u) {
    return new Locale(u);
  }
  protected BranchGroup createSceneBranchGroup() {
    m_SceneBranchGroup = new BranchGroup();
    return m_SceneBranchGroup;
  }
  protected View createView(ViewPlatform vp) {
    View view = new View();
    PhysicalBody pb = createPhysicalBody();
    PhysicalEnvironment pe = createPhysicalEnvironment();
    AudioDevice audioDevice = createAudioDevice(pe);
    if (audioDevice != null) {
      pe.setAudioDevice(audioDevice);
      audioDevice.initialize();
    }
    view.setPhysicalEnvironment(pe);
    view.setPhysicalBody(pb);
    if (vp != null)
      view.attachViewPlatform(vp);
    view.setBackClipDistance(getBackClipDistance());
    view.setFrontClipDistance(getFrontClipDistance());
    Canvas3D c3d = createCanvas3D();
    view.addCanvas3D(c3d);
    addCanvas3D(c3d);
    return view;
  }
  protected PhysicalBody createPhysicalBody() {
    return new PhysicalBody();
  }
  protected AudioDevice createAudioDevice(PhysicalEnvironment pe) {
    JavaSoundMixer javaSoundMixer = new JavaSoundMixer(pe);
    if (javaSoundMixer == null)
      System.out.println("create of audiodevice failed");
    return javaSoundMixer;
  }
  protected PhysicalEnvironment createPhysicalEnvironment() {
    return new PhysicalEnvironment();
  }
  protected float getViewPlatformActivationRadius() {
    return 100;
  }
  protected ViewPlatform createViewPlatform() {
    ViewPlatform vp = new ViewPlatform();
    vp.setViewAttachPolicy(View.RELATIVE_TO_FIELD_OF_VIEW);
    vp.setActivationRadius(getViewPlatformActivationRadius());
    return vp;
  }
  protected Canvas3D createCanvas3D() {
    GraphicsConfigTemplate3D gc3D = new GraphicsConfigTemplate3D();
    gc3D.setSceneAntialiasing(GraphicsConfigTemplate.PREFERRED);
    GraphicsDevice gd[] = GraphicsEnvironment.getLocalGraphicsEnvironment()
        .getScreenDevices();
    Canvas3D c3d = new Canvas3D(gd[0].getBestConfiguration(gc3D));
    c3d.setSize(getCanvas3dWidth(c3d), getCanvas3dHeight(c3d));
    return c3d;
  }
  protected int getCanvas3dWidth(Canvas3D c3d) {
    return m_kWidth;
  }
  protected int getCanvas3dHeight(Canvas3D c3d) {
    return m_kHeight;
  }
  protected double getBackClipDistance() {
    return 100.0;
  }
  protected double getFrontClipDistance() {
    return 1.0;
  }
  protected BranchGroup createViewBranchGroup(TransformGroup[] tgArray,
      ViewPlatform vp) {
    BranchGroup vpBranchGroup = new BranchGroup();
    if (tgArray != null && tgArray.length > 0) {
      Group parentGroup = vpBranchGroup;
      TransformGroup curTg = null;
      for (int n = 0; n < tgArray.length; n++) {
        curTg = tgArray[n];
        parentGroup.addChild(curTg);
        parentGroup = curTg;
      }
      tgArray[tgArray.length - 1].addChild(vp);
    } else
      vpBranchGroup.addChild(vp);
    return vpBranchGroup;
  }
  protected void addCanvas3D(Canvas3D c3d) {
    setLayout(new BorderLayout());
    add(c3d, BorderLayout.CENTER);
    doLayout();
  }
  protected VirtualUniverse createVirtualUniverse() {
    return new VirtualUniverse();
  }
  protected void saveCommandLineArguments(String[] szArgs) {
    m_szCommandLineArray = szArgs;
  }
  protected String[] getCommandLineArguments() {
    return m_szCommandLineArray;
  }
}

This creates a rotation interpolator and applies it to a shape

/*
Essential Java 3D Fast
Ian Palmer
Publisher: Springer-Verlag
ISBN: 1-85233-394-4
*/
import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Frame;
import java.awt.Panel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.media.j3d.AmbientLight;
import javax.media.j3d.BoundingSphere;
import javax.media.j3d.BranchGroup;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.DirectionalLight;
import javax.media.j3d.Locale;
import javax.media.j3d.PhysicalBody;
import javax.media.j3d.PhysicalEnvironment;
import javax.media.j3d.Transform3D;
import javax.media.j3d.TransformGroup;
import javax.media.j3d.View;
import javax.media.j3d.ViewPlatform;
import javax.media.j3d.VirtualUniverse;
import javax.vecmath.Color3f;
import javax.vecmath.Point3d;
import javax.vecmath.Vector3f;
/**
 * This creates a rotation interpolator and applies it to a shape.
 * 
 * @author I.J.Palmer
 * @version 1.0
 */
public class SimpleRotator extends Frame implements ActionListener {
  protected Canvas3D myCanvas3D = new Canvas3D(null);
  protected Button exitButton = new Button("Exit");
  /**
   * This function builds the view branch of the scene graph. It creates a
   * branch group and then creates the necessary view elements to give a
   * useful view of our content.
   * 
   * @param c
   *            Canvas3D that will display the view
   * @return BranchGroup that is the root of the view elements
   */
  protected BranchGroup buildViewBranch(Canvas3D c) {
    BranchGroup viewBranch = new BranchGroup();
    Transform3D viewXfm = new Transform3D();
    viewXfm.set(new Vector3f(0.0f, 0.0f, 10.0f));
    TransformGroup viewXfmGroup = new TransformGroup(viewXfm);
    ViewPlatform myViewPlatform = new ViewPlatform();
    PhysicalBody myBody = new PhysicalBody();
    PhysicalEnvironment myEnvironment = new PhysicalEnvironment();
    viewXfmGroup.addChild(myViewPlatform);
    viewBranch.addChild(viewXfmGroup);
    View myView = new View();
    myView.addCanvas3D(c);
    myView.attachViewPlatform(myViewPlatform);
    myView.setPhysicalBody(myBody);
    myView.setPhysicalEnvironment(myEnvironment);
    return viewBranch;
  }
  /**
   * Add some lights so that we can illuminate the scene. This adds one
   * ambient light to bring up the overall lighting level and one directional
   * shape to show the shape of the objects in the scene.
   * 
   * @param b
   *            BranchGroup that the lights are to be added to.
   */
  protected void addLights(BranchGroup b) {
    BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0),
        100.0);
    Color3f ambLightColour = new Color3f(0.5f, 0.5f, 0.5f);
    AmbientLight ambLight = new AmbientLight(ambLightColour);
    ambLight.setInfluencingBounds(bounds);
    Color3f dirLightColour = new Color3f(1.0f, 1.0f, 1.0f);
    Vector3f dirLightDir = new Vector3f(-1.0f, -1.0f, -1.0f);
    DirectionalLight dirLight = new DirectionalLight(dirLightColour,
        dirLightDir);
    dirLight.setInfluencingBounds(bounds);
    b.addChild(ambLight);
    b.addChild(dirLight);
  }
  /**
   * This builds the content branch of our scene graph. The root of the shapes
   * supplied as a parameter is slightly tilted to reveal its 3D shape. It
   * also uses the addLights function to add some lights to the scene. We also
   * create the alpha generator and the rotation interpolator to perform the
   * animation.
   * 
   * @param shape
   *            Node that represents the geometry for the content
   * @return BranchGroup that is the root of the content branch / protected
   *         BranchGroup buildContentBranch(Node shape) { BranchGroup
   *         contentBranch = new BranchGroup(); //Create the transform and
   *         group used for the rotation Transform3D rotateCube = new
   *         Transform3D( ); TransformGroup rotationGroup = new
   *         TransformGroup(rotateCube); //Set the capability so we can write
   *         the transform rotationGroup.setCapability(
   *         TransformGroup.ALLOW_TRANSFORM_WRITE); //Create the alpha
   *         generator Alpha rotationAlpha = new Alpha(
   *         -1,Alpha.INCREASING_ENABLE,0,0,4000,0,0,0,0,0); //Build the
   *         interpolator Transform3D yAxis = new Transform3D();
   *         RotationInterpolator rotator = new
   *         RotationInterpolator(rotationAlpha, rotationGroup, yAxis, 0.0f,
   *         (float) Math.PI*2.0f); BoundingSphere bounds = new
   *         BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);
   *         rotator.setSchedulingBounds(bounds); //Put all this together
   *         contentBranch.addChild(rotationGroup);
   *         rotationGroup.addChild(shape); rotationGroup.addChild(rotator);
   *         addLights(contentBranch); return contentBranch; } /** This
   *         creates the shape used in the program.
   * @return Node that is the switch node / protected Node buildShape() {
   *         Appearance app = new Appearance(); Color3f ambientColour = new
   *         Color3f(1.0f,0.0f,0.0f); Color3f emissiveColour = new
   *         Color3f(0.0f,0.0f,0.0f); Color3f specularColour = new
   *         Color3f(1.0f,1.0f,1.0f); Color3f diffuseColour = new
   *         Color3f(1.0f,0.0f,0.0f); float shininess = 20.0f;
   *         app.setMaterial(new Material(ambientColour,emissiveColour,
   *         diffuseColour,specularColour,shininess)); return new Box(2.0f,
   *         2.0f, 2.0f, app); } /** Process the button action to exit the
   *         program.
   */
  public void actionPerformed(ActionEvent e) {
    if (e.getSource() == exitButton) {
      dispose();
      System.exit(0);
    }
  }
  public SimpleRotator() {
    VirtualUniverse myUniverse = new VirtualUniverse();
    Locale myLocale = new Locale(myUniverse);
    myLocale.addBranchGraph(buildViewBranch(myCanvas3D));
    //  myLocale.addBranchGraph(buildContentBranch(buildShape()));
    setTitle("SimpleRotator");
    setSize(400, 400);
    setLayout(new BorderLayout());
    Panel bottom = new Panel();
    bottom.add(exitButton);
    add(BorderLayout.CENTER, myCanvas3D);
    add(BorderLayout.SOUTH, bottom);
    exitButton.addActionListener(this);
    setVisible(true);
  }
  public static void main(String[] args) {
    SimpleRotator sr = new SimpleRotator();
  }
}