Thanks a lot for the reply. Unfortunately, I'm still not getting it. I don't understand what you mean about the rotation interpolator. All I seem to be able to do is spin the cube in place or orbit it around a far off axis. I feel like there's something simple that I'm just not grasping. Below is the code I have.
Thanks again.
import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.GraphicsConfiguration;
import java.awt.event.KeyEvent;
import java.util.Enumeration;
import javax.media.j3d.Behavior;
import javax.media.j3d.BoundingSphere;
import javax.media.j3d.BranchGroup;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.Transform3D;
import javax.media.j3d.TransformGroup;
import javax.media.j3d.WakeupOnAWTEvent;
import javax.vecmath.Vector3f;
import com.sun.j3d.utils.geometry.ColorCube;
import com.sun.j3d.utils.universe.SimpleUniverse;
public class CubeTest extends Applet {
public CubeTest() {
setLayout(new BorderLayout());
GraphicsConfiguration config = SimpleUniverse.getPreferredConfiguration();
// Create Canvas3D and add to frame
Canvas3D c = new Canvas3D(config);
add("Center", c);
// Create a simple scene and attach it to the virtual universe
BranchGroup scene = createSceneGraph();
scene.compile();
// Create a simple universe and add the scene to it
SimpleUniverse u = new SimpleUniverse(c);
u.getViewingPlatform().setNominalViewingTransform();
u.addBranchGraph(scene);
}
public BranchGroup createSceneGraph() {
// Create the root of the branch graph
BranchGroup objRoot = new BranchGroup();
// Create 2 transforms for isometric view
Transform3D rotate1 = new Transform3D();
Transform3D rotate2 = new Transform3D();
rotate1.rotX(Math.PI/4.0d);
rotate2.rotY(Math.PI/5.0d);
rotate1.mul(rotate2);
// Create transform group with rotations
TransformGroup objRotate = new TransformGroup(rotate1);
// Allow transform to be changed
objRotate.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
// Add cube to transform group
objRotate.addChild(new ColorCube(0.2));
// Create behavior object with transform group
SimpleBehavior rotateBehavior = new SimpleBehavior(objRotate);
rotateBehavior.setSchedulingBounds(new BoundingSphere());
// Add behavior to transform group
objRotate.addChild(rotateBehavior);
// Add transform group to root
objRoot.addChild(objRotate);
return objRoot;
}
public static void main(String[] args) {
CubeTest c = new CubeTest();
}
class SimpleBehavior extends Behavior {
private TransformGroup targetTG;
private Transform3D rotation = new Transform3D();
private Transform3D translation = new Transform3D();
private double rotateAngle = -0.1;
// create SimpleBehavior - set TG object of change
public SimpleBehavior(TransformGroup targetTG){
this.targetTG = targetTG;
}
// Initialize the behavior
// called when behavior becomes live
public void initialize(){
// Set initial wakeup condition
this.wakeupOn(new WakeupOnAWTEvent(KeyEvent.KEY_PRESSED));
}
// Called by Java 3D when appropriate stimulus occurs
public void processStimulus(Enumeration criteria){
// Get current transform
Transform3D transform = new Transform3D();
targetTG.getTransform(transform);
translation.setTranslation(new Vector3f(-0.1f, -0.1f, -0.1f));
transform.mul(translation);
targetTG.setTransform(transform);
// Create new transform and add to transform group
rotation.rotZ(rotateAngle);
transform.mul(rotation);
targetTG.setTransform(transform);
// Reset wakeup condition
this.wakeupOn(new WakeupOnAWTEvent(KeyEvent.KEY_PRESSED));
}
} // end of class SimpleBehavior
}
/*
* $RCSfile: HelloUniverse.java,v $
*
* Copyright (c) 2006 Sun Microsystems, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistribution of source code must retain the above copyright
*notice, this list of conditions and the following disclaimer.
*
* - Redistribution in binary form must reproduce the above copyright
*notice, this list of conditions and the following disclaimer in
*the documentation and/or other materials provided with the
*distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may 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 OR NON-INFRINGEMENT, ARE HEREBY
* EXCLUDED. SUN MICROSYSTEMS, INC. ("SUN") AND ITS 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 SUN OR ITS 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 SUN HAS BEEN 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.
*
* $Revision: 1.1 $
* $Date: 2006/02/01 01:32:42 $
* $State: Exp $
*/
import com.sun.j3d.utils.universe.*;
import com.sun.j3d.utils.geometry.ColorCube;
import javax.media.j3d.*;
import javax.vecmath.*;
import java.awt.GraphicsConfiguration;
/**
* Simple Java 3D example program to display a spinning cube.
*/
public class HelloUniverse extends javax.swing.JFrame {
private SimpleUniverse univ = null;
private BranchGroup scene = null;
public BranchGroup createSceneGraph() {
// Create the root of the branch graph
BranchGroup objRoot = new BranchGroup();
// Create the TransformGroup node and initialize it to the
// identity. Enable the TRANSFORM_WRITE capability so that
// our behavior code can modify it at run time. Add it to
// the root of the subgraph.
TransformGroup objTrans = new TransformGroup();
objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
objRoot.addChild(objTrans);
//add these lines to insert a rotation node into the scene graph.
//*************************************
TransformGroup objRot = new TransformGroup();
objRot.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
objTrans.addChild(objRot);
Vector3f vec = new Vector3f(-0.5f, -0.5f, -0.5f);
Transform3D tmpTransform = new Transform3D();
objTrans.getTransform(tmpTransform);
tmpTransform.setTranslation(vec);
objTrans.setTransform(tmpTransform);
//************************************
// Create a simple Shape3D node; add it to objRot.
objRot.addChild(new ColorCube(0.4));
// Create a new Behavior object that will perform the
// desired operation on the specified transform and add
// it into the scene graph.
Transform3D yAxis = new Transform3D();
Alpha rotationAlpha = new Alpha(-1, 4000);
// Create a rotation and add it to the objRot node
RotationInterpolator rotator =
new RotationInterpolator(rotationAlpha, objRot, 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);
objRoot.addChild(rotator);
// Have Java 3D perform optimizations on this scene graph.
objRoot.compile();
return objRoot;
}
private Canvas3D createUniverse() {
// Get the preferred graphics configuration for the default screen
GraphicsConfiguration config =
SimpleUniverse.getPreferredConfiguration();
// Create a Canvas3D using the preferred configuration
Canvas3D c = new Canvas3D(config);
// Create simple universe with view branch
univ = new SimpleUniverse(c);
// This will move the ViewPlatform back a bit so the
// objects in the scene can be viewed.
univ.getViewingPlatform().setNominalViewingTransform();
// Ensure at least 5 msec per frame (i.e., < 200Hz)
univ.getViewer().getView().setMinimumFrameCycleTime(5);
return c;
}
/**
* Creates new form HelloUniverse
*/
public HelloUniverse() {
// Initialize the GUI components
initComponents();
// Create Canvas3D and SimpleUniverse; add canvas to drawing panel
Canvas3D c = createUniverse();
drawingPanel.add(c, java.awt.BorderLayout.CENTER);
// Create the content branch and add it to the universe
scene = createSceneGraph();
univ.addBranchGraph(scene);
}
// -
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
// <editor-fold defaultstate="collapsed" desc=" Generated Code ">//GEN-BEGIN:initComponents
private void initComponents() {
drawingPanel = new javax.swing.JPanel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle("HelloUniverse");
drawingPanel.setLayout(new java.awt.BorderLayout());
drawingPanel.setPreferredSize(new java.awt.Dimension(250, 250));
getContentPane().add(drawingPanel, java.awt.BorderLayout.CENTER);
pack();
}// </editor-fold>//GEN-END:initComponents
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new HelloUniverse().setVisible(true);
}
});
}
// Variables declaration - do not modify//GEN-BEGIN:variables
private javax.swing.JPanel drawingPanel;
// End of variables declaration//GEN-END:variables
}
regards
