3d applet gets stuck

From:

Thorsten Kiefer <webmaster@nillakaes.de>

Newsgroups:

comp.lang.java.programmer

Date:

Sun, 23 Mar 2008 22:33:38 +0100

Message-ID:

<47e6cc84$0$584$6e1ede2f@read.cnntp.org>

Hi,
my applet runs nicely as stand alone application,
but when I start it in a browser, the VM gets stuck
consuming 100% CPU. Here is the code :

-----------------------------------------------------------------------
<html>
<head>
</head>
<body>
        <applet code="org.jdesktop.applet.util.JNLPAppletLauncher"
                width=640
                height=480
                archive="test3d2.jar,
http://download.java.net/media/applet-launcher/applet-launcher.jar,
http://download.java.net/media/java3d/webstart/release/j3d/latest/j3dcore.jar,
http://download.java.net/media/java3d/webstart/release/j3d/latest/j3dutils.jar,
http://download.java.net/media/jogl/builds/archive/jsr-231-webstart-current/
jogl.jar,
http://download.java.net/media/gluegen/webstart/gluegen-rt.jar,
http://download.java.net/media/java3d/webstart/release/vecmath/latest/
vecmath.jar">
                <param name="codebase_lookup" value="false">
                <param name="subapplet.classname"
                        value="test3d2.MainApplet">
                <param name="subapplet.displayname"
                        value="My Java 3D Applet">
                <param name="jnlpNumExtensions" value="1">
                <param name="jnlpExtension1"
value="http://download.java.net/media/java3d/webstart/release/
        java3d-latest.jnlp">
                <param name="progressbar" value="true">
                <param name="noddraw.check" value="true">
        </applet>
</body>
</html>
--------------------------------------------------------------------------

package test3d2;

import com.sun.j3d.utils.geometry.ColorCube;
import com.sun.j3d.utils.universe.SimpleUniverse;
import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.GraphicsConfiguration;
import javax.media.j3d.Alpha;
import javax.media.j3d.BoundingSphere;
import javax.media.j3d.BranchGroup;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.Node;
import javax.media.j3d.RotationInterpolator;
import javax.media.j3d.Transform3D;
import javax.media.j3d.TransformGroup;

/**
*
* @author thorsten
*/
public class MainApplet extends Applet {

    public void init() {
        GraphicsConfiguration graphicsConfig =
                SimpleUniverse.getPreferredConfiguration();
        Canvas3D canvas = new Canvas3D(graphicsConfig);
        setLayout(new BorderLayout());
        add(canvas,BorderLayout.CENTER);

        BranchGroup scene = createSceneGraph();
        scene.compile();

        SimpleUniverse su = new SimpleUniverse(canvas);
        su.getViewingPlatform().setNominalViewingTransform();
        su.addBranchGraph(scene);
    }

    public void start() {

    }

    public void stop() {

    }

    public void destroy() {

    }

    public BranchGroup createSceneGraph(){
        Transform3D tr = new Transform3D();
        tr.rotX(Math.PI/4.0);

        BranchGroup root = new BranchGroup();
        TransformGroup tg1 = new TransformGroup(tr);
        TransformGroup tg2 = new TransformGroup();
        tg2.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);

        Node n = new ColorCube(0.4);
        Alpha rotAlpha = new Alpha(-1,4000);
        RotationInterpolator rotator = new
                RotationInterpolator(rotAlpha,tg2);
        BoundingSphere bounds = new BoundingSphere();

        rotator.setSchedulingBounds(bounds);


        tg1.addChild(tg2);
        tg2.addChild(n);
        tg2.addChild(rotator);
        root.addChild(tg1);
        return root;
    }
}

Best regards
Thorsten