AppletTalk.com

Andrew Neiderer · Guest

I have not done any Java3D for 4/3 years now but I am starting to get back to it.
Since then our sys administrators have placed JDK 1.6 (used to be 1.4.2) on our
Linux RH Enterprise 2.4 and I think Java3D 1.4. I can translate HelloUniverse.java
just fine, but when I go to execute it I get the following

------------------------------------------------------------------------------------------------------------------------------------------------

$java HelloUniverse

Java 3D WARNING : reported GLX version = 1.2

GLX version 1.3 or higher is required

The reported version number may be incorrect. There is a known

ATI driver bug in glXQueryVersion that incorrectly reports the GLX

version as 1.2 when it really is 1.3, so Java 3D will attempt to

run anyway.

************************************************************************

*** ERROR: Canvas3D constructed with a null GraphicsConfiguration

*** This will cause a NullPointerException in a subsequent release

************************************************************************

Exception in thread "Thread-1" java.lang.NullPointerException: Canvas3D: null

aphicsConfiguration

at javax.media.j3d.Canvas3D.<init>(Canvas3D.java:1182)

at javax.media.j3d.Canvas3D.<init>(Canvas3D.java:1147)

at HelloUniverse.init(HelloUniverse.java:102)

at com.sun.j3d.utils.applet.MainFrame.run(MainFrame.java:267)

at java.lang.Thread.run(Thread.java:595)

Do I need some driver s/w or something ? The graphics card we have is an ATI Radeon.

Please provide suggestions or URLs so that I can start doing some Java3D programming, which I prefer.

I include HelloUniverse.java since I vaguely recall talk about the Canvas3D and configuration (?).

Thank you.

- Andrew M. Neiderer

- US Army Research Lab

public class HelloUniverse extends Applet {

private SimpleUniverse u = 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);

// Create a simple Shape3D node; add it to the scene graph.

objTrans.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);

RotationInterpolator rotator =

new RotationInterpolator(rotationAlpha, objTrans, 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;

}

public HelloUniverse() {

}

public void init() {

setLayout(new BorderLayout());

GraphicsDevice dev =

GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevic

e();

GraphicsConfigTemplate3D template = new GraphicsConfigTemplate3D();

GraphicsConfiguration config =

GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevic

e().getBestConfiguration(template);

Canvas3D canvas3d = new Canvas3D(config);

add("Center",canvas3d);

// Create a simple scene and attach it to the virtual universe

BranchGroup scene = createSceneGraph();

u = new SimpleUniverse(canvas3d);

// This will move the ViewPlatform back a bit so the

// objects in the scene can be viewed.

u.getViewingPlatform().setNominalViewingTransform();

u.addBranchGraph(scene);

}

public void destroy() {

u.cleanup();

}

//

// The following allows HelloUniverse to be run as an application

// as well as an applet

//

public static void main(String[] args) {

new MainFrame(new HelloUniverse(), 256, 256);

}

}

Alexander Gran · Guest

Andrew Neiderer wrote: