Hi All,
When trying to help a fellow lister who was receiving the following error, I
also get the error. It occurs when you attempt to remove a live branch
group containing a morph object from the scene graph. To illustrate the
example, I modified Sun's MorphApp example by adding the detach capability
to the branch group containing the morph object (line 167) and by calling
detach on the branch group (line 226). The modified code is attached.
Here is the error:
java.lang.ClassCastException: javax.media.j3d.MorphRetained
at
javax.media.j3d.RenderingEnvironmentStructure.removeNodes(RenderingEn
vironmentStructure.java:337)
at
javax.media.j3d.RenderingEnvironmentStructure.processMessages(Renderi
ngEnvironmentStructure.java:173)
at
javax.media.j3d.StructureUpdateThread.doWork(StructureUpdateThread.ja
va:79)
at javax.media.j3d.J3dThread.run(J3dThread.java:256)
This seems to be a bug. Is it?
Evan
/*
* @(#)MorphApp.java 1.0 99/03/25 11:42:40
*
* Copyright (c) 1996-1999 Sun Microsystems, Inc. All Rights Reserved.
*
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* which is disparaging to Sun.
*
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* IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
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* This software is not designed or intended for use in on-line control of
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*/
import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.Frame;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.universe.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import java.util.Enumeration;
// MorphApp renders a single ColorCube
// that rotates when any key is pressed.
public class MorphApp extends Applet {
public class MorphBehavior extends Behavior{
private Morph targetMorph;
private Alpha alpha;
// the following two members are here for effciency (no memory burn)
private double[] weights = {0, 0, 0, 0};
private WakeupCondition trigger = new WakeupOnElapsedFrames(0);
// create MorphBehavior
MorphBehavior(Morph targetMorph, Alpha alpha){
this.targetMorph = targetMorph;
this.alpha = alpha;
}
public void initialize(){
// set initial wakeup condition
this.wakeupOn(trigger);
}
public void processStimulus(Enumeration criteria){
// don't need to decode event since there is only one trigger
// do what is necessary
weights[0] = 0;
weights[1] = 0;
weights[2] = 0;
weights[3] = 0;
float alphaValue = 4f * alpha.value() - 0.00001f;
int alphaIndex = (int) alphaValue;
weights[alphaIndex] = (double) alphaValue - (double)alphaIndex;
if(alphaIndex < 3)
weights[alphaIndex + 1] = 1.0 - weights[alphaIndex];
else
weights[0] = 1.0 - weights[alphaIndex];
targetMorph.setWeights(weights);
// set next wakeup condition
this.wakeupOn(trigger);
}
} // end of class MorphBehavior
public GeometryArray createGeomArray0(){
int[] counts = {7, 5, 2};
LineStripArray geom = new LineStripArray(14, GeometryArray.COORDINATES | GeometryArray.COLOR_3, counts);
float[] coordinates = { 0.00f, 0.05f, 0f, -0.01f, 0.15f, 0f, 0.05f, 0.25f, 0f,
0.00f, 0.60f, 0f,
0.01f, 0.30f, 0f, 0.04f, 0.00f, 0f, 0.09f, 0.00f, 0f,
0.15f, 0.71f, 0f, -0.01f, 0.69f, 0f,
0.06f, 1.10f, 0f,
-0.05f, 0.75f, 0f, 0.14f, 0.75f, 0f,
0.06f, 1.10f, 0f, 0.00f, 0.60f, 0f};
geom.setCoordinates(0, coordinates);
// not setting the colors is the same as setting them to black
// Color3f c = new Color3f(0f, 0f, 0f);
// for (int i = 0; i < 14; i++) geom.setColor(i, c);
return geom;
}
public GeometryArray createGeomArray1(){
int[] counts = {7, 5, 2};
LineStripArray geom = new LineStripArray(14, GeometryArray.COORDINATES | GeometryArray.COLOR_3, counts);
float[] coordinates = { -0.10f, 0.00f, 0f, -0.15f, 0.08f, 0f, -0.05f, 0.30f, 0f,
0.00f, 0.60f, 0f,
0.15f, 0.30f, 0f, 0.10f, 0.00f, 0f, 0.15f, 0.05f, 0f,
0.05f, 0.70f, 0f, -0.05f, 0.80f, 0f,
0.06f, 1.10f, 0f,
0.05f, 0.70f, 0f, 0.20f, 0.80f, 0f,
0.06f, 1.10f, 0f, 0.00f, 0.60f, 0f};
geom.setCoordinates(0, coordinates);
// not setting the colors is the same as setting them to black
// Color3f c = new Color3f(0f, 0f, 0f);
// for (int i = 0; i < 14; i++) geom.setColor(i, c);
return geom;
}
public GeometryArray createGeomArray2(){
int[] counts = {7, 5, 2};
LineStripArray geom = new LineStripArray(14, GeometryArray.COORDINATES | GeometryArray.COLOR_3, counts);
float[] coordinates = { 0.09f, 0.00f, 0f, 0.04f, 0.00f, 0f, 0.01f, 0.30f, 0f,
0.00f, 0.60f, 0f,
0.05f, 0.25f, 0f, -0.01f, 0.15f, 0f, 0.00f, 0.05f, 0f,
0.14f, 0.75f, 0f, -0.05f, 0.75f, 0f,
0.06f, 1.10f, 0f,
-0.01f, 0.69f, 0f, 0.15f, 0.71f, 0f,
0.06f, 1.10f, 0f, 0.00f, 0.60f, 0f};
geom.setCoordinates(0, coordinates);
// not setting the colors is the same as setting them to black
// Color3f c = new Color3f(0f, 0f, 0f);
// for (int i = 0; i < 14; i++) geom.setColor(i, c);
return geom;
}
public GeometryArray createGeomArray3(){
int[] counts = {7, 5, 2};
LineStripArray geom = new LineStripArray(14, GeometryArray.COORDINATES | GeometryArray.COLOR_3, counts);
float[] coordinates = { 0.15f, 0.05f, 0f, 0.10f, 0.00f, 0f, 0.15f, 0.30f, 0f,
0.00f, 0.60f, 0f,
-0.05f, 0.30f, 0f, -0.15f, 0.08f, 0f, -0.10f, 0.00f, 0f,
0.20f, 0.80f, 0f, 0.05f, 0.70f, 0f,
0.06f, 1.10f, 0f,
-0.05f, 0.80f, 0f, 0.05f, 0.70f, 0f,
0.06f, 1.10f, 0f, 0.00f, 0.60f, 0f};
geom.setCoordinates(0, coordinates);
// not setting the colors is the same as setting them to black
// Color3f c = new Color3f(0f, 0f, 0f);
// for (int i = 0; i < 14; i++) geom.setColor(i, c);
return geom;
}
public BranchGroup createSceneGraph() {
// Create the root of the branch graph
BranchGroup objRoot = new BranchGroup();
objRoot.setCapability(BranchGroup.ALLOW_DETACH); // Added by Evan
Transform3D t3d = new Transform3D();
t3d.set(new Vector3f(0f, -0.5f, 0f));
TransformGroup translate = new TransformGroup(t3d);
// create GeometryArray[] (array of GeometryArray objects)
GeometryArray[] geomArray = new GeometryArray[4];
geomArray[0] = createGeomArray0();
geomArray[1] = createGeomArray1();
geomArray[2] = createGeomArray2();
geomArray[3] = createGeomArray3();
// create morph object
Morph morphObj = new Morph(geomArray);
morphObj.setCapability(Morph.ALLOW_WEIGHTS_WRITE);
// create alpha object
Alpha alpha = new Alpha(-1, 1, 0, 0, 2000, 100, 0, 0, 0, 0);
// create morph driving behavior
MorphBehavior morphBehav = new MorphBehavior(morphObj, alpha);
morphBehav.setSchedulingBounds(new BoundingSphere());
//assemble scene graph
objRoot.addChild(translate);
translate.addChild(morphObj);
objRoot.addChild(morphBehav);
Background background = new Background();
background.setColor(1f, 1f, 1f);
background.setApplicationBounds(new BoundingSphere());
objRoot.addChild(background);
// Let Java 3D perform optimizations on this scene graph.
objRoot.compile();
return objRoot;
} // end of CreateSceneGraph method of MorphApp
// Create a simple scene and attach it to the virtual universe
public MorphApp() {
setLayout(new BorderLayout());
Canvas3D canvas3D = new Canvas3D(null);
add("Center", canvas3D);
BranchGroup scene = createSceneGraph();
// SimpleUniverse is a Convenience Utility class
SimpleUniverse simpleU = new SimpleUniverse(canvas3D);
// This will move the ViewPlatform back a bit so the
// objects in the scene can be viewed.
simpleU.getViewingPlatform().setNominalViewingTransform();
simpleU.addBranchGraph(scene);
// Detach the branch group (added by Evan)
scene.detach();
} // end of MorphApp (constructor)
// The following allows this to be run as an application
// as well as an applet
public static void main(String[] args) {
System.out.print("MorphApp.java \n- a demonstration of animation");
System.out.println("using the Morph class in a Java 3D scene.");
System.out.println("This is a simple example progam from The Java 3D API Tutorial.");
System.out.println("The Java 3D Tutorial is available on the web at:");
System.out.println("http://java.sun.com/products/java-media/3D/collateral");
Frame frame = new MainFrame(new MorphApp(), 256, 256);
} // end of main (method of MorphApp)
} // end of class MorphApp
