[JAVA3D] Troubles with 2D overlay

[Gerhard Gelbmann]

I want to use the J3D library (www.j3d.org) to add some 2D overlays to my scene. my problems is, that I just can't figure out, why even the provided example does not display any overlays. anybody got suggestions please?   here is the sample code, I use (it actually is same as the example provided with the J3D code repository):     public class LabelDemo extends DemoFrame {     private static final double BACK_CLIP_DISTANCE = 100.0;       /** The overlay we're putting labels on */     private LabelOverlay overlay;       /**      * Construct a new demo with no geometry currently showing, but the      * default type is set to quads.      */     public LabelDemo()     {         super("Label test window");           buildScene();           overlay.initialize();     }       /**      * Build the scenegraph for the canvas      */     private void buildScene()     {         Color3f white = new Color3f(1, 1, 1);           VirtualUniverse universe = new VirtualUniverse();         Locale locale = new Locale(universe);           BranchGroup view_group = new BranchGroup();         BranchGroup world_object_group = new BranchGroup();           ViewPlatform camera = new ViewPlatform();           Transform3D angle = new Transform3D();         angle.setTranslation(new Vector3d(0, 2, 10));           TransformGroup view_tg = new TransformGroup(angle);         view_tg.setCapability(TransformGroup.ALLOW_CHILDREN_EXTEND);         view_tg.setCapability(TransformGroup.ALLOW_CHILDREN_WRITE);         view_tg.addChild(camera);           //         com.sun.j3d.utils.geometry.ColorCube cc = new com.sun.j3d.utils.geometry.ColorCube(10.0);         Transform3D cc_tr = new Transform3D();         cc_tr.setTranslation(new Vector3d(0.0, 0.0, -30.0));         TransformGroup cc_grp = new TransformGroup(cc_tr);         cc_grp.addChild(cc);           view_group.addChild(view_tg);         view_group.addChild(cc_grp);           Point3d origin = new Point3d(0, 0, 0);         BoundingSphere light_bounds =             new BoundingSphere(origin, BACK_CLIP_DISTANCE);         DirectionalLight headlight = new DirectionalLight();         headlight.setColor(white);         headlight.setInfluencingBounds(light_bounds);         view_tg.addChild(headlight);           // And the axis...         Axis axis = new Axis();         world_object_group.addChild(axis);         world_object_group.compile();           // Add them to the locale         PhysicalBody body = new PhysicalBody();         PhysicalEnvironment env = new PhysicalEnvironment();           View view = new View();         view.setBackClipDistance(BACK_CLIP_DISTANCE);         view.setPhysicalBody(body);         view.setPhysicalEnvironment(env);         view.addCanvas3D(canvas);         view.attachViewPlatform(camera);           overlay = new LabelOverlay(canvas,                                    new Rectangle(10, 10, 100, 50),                                    "hello world");         overlay.setVisible(true);           view_tg.addChild(overlay.getRoot());         overlay.repaint();         locale.addBranchGraph(view_group);           locale.addBranchGraph(world_object_group);     }       public static void main(String[] argv)     {         LabelDemo demo = new LabelDemo();         demo.setVisible(true);     } }       greets,    barney