Re: [JAVA3D] How to repaint the J3D scene after an interactive in put

[Yazel, David J.]

The way this is written it looks like you would be adding objTrans each time to the dynamicBGroup.  So after a few runs your branch group would be full of copies, once from each call to drawSceneGraph.  Also, you are compiling the scene, which you should not do.  You should only compile things you will not  be changing.  The fastest way to fix this is to make the dynamicBGroup in your drawSceneGraph() method after detaching the former one... in other words destroy the former instantiation of your graph by detaching the dynamicBGroup, then build a new one and attach it.  This is going to flicker, by the way, since this is not being done in a behavior.   Dave Yazel -----Original Message----- From: Sheng Feng Qin [mailto:[EMAIL PROTECTED]] Sent: Wednesday, March 14, 2001 8:34 AM To: [EMAIL PROTECTED] Subject: Re: [JAVA3D] How to repaint the J3D scene after an interactive input Hi Dave, Thank you for your help on repainting J3D. I have tried dynamic branchgroup and detach() method, but i still can go through. Could you please have a look at my code,  I first create a SimpleUniverse and a root BranchGraph--scene, and a dynamic node. In drawsceneGraph method, If it is a first call, active3D is false. Afterwards, detach the dynamic node first, then add it to scene again.   //////////////////////////////////////////////////////////////////////   GraphicsConfiguration config =          SimpleUniverse.getPreferredConfiguration();     c = new Canvas3D(config   add(c,BorderLayout.CENTER);   u = new SimpleUniverse(c);   scene=createBranchGraph();   // Create a dynamic  branch graph   dynamicBGroup = new BranchGroup();   dynamicBGroup.setCapability(BranchGroup.ALLOW_DETACH);   /////////////////////////////////////////////////////////////        public void drawSceneGraph() {    if(active3D)// if it is not first time to display the scene    {     dynamicBGroup.detach();    }    // Create a bounds for the background and lights     BoundingSphere bounds =       new BoundingSphere(new Point3d(0.0,0.0,0.0), 300.0       TransformGroup objTrans = new TransformGroup();      objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);      objTrans.setCapability( TransformGroup.ALLOW_TRANSFORM_READ );         objTrans.setCapability(TransformGroup.ENABLE_PICK_REPORTING);        drawShapeObjectToScene(objTrans);        // Create the rotate behavior node    MouseRotate behavior = new MouseRotate(objTrans);    objTrans.addChild(behavior);    behavior.setSchedulingBounds(bounds);      // Create the zoom behavior node    MouseZoom behavior2 = new MouseZoom(objTrans);    objTrans.addChild(behavior2);       behavior2.setSchedulingBounds(bounds    dynamicBGroup.addChild(objTrans);    scene.addChild(dynamicBGroup);    if(!active3D)    {    scene.compile();    u.addBranchGraph(scene);    u.getViewingPlatform().setNominalViewingTransform();    active3D=true;    }   } ----- Original Message ----- From: David To: [EMAIL PROTECTED] Sent: Wednesday, March 14, 2001 11:54 AM Subject: Re: [JAVA3D] How to repaint the J3D scene after an interactive input Try putting a BranchGroup called root in the simple universe, then attaching your dynamic branchgroups to root, then using the detach() method to remove the dynamic branch groups from root.  Make sure you set the capabilities of the nodes to allow detaching.   Dave Yazel ----- Original Message ----- From: Sheng Feng Qin To: [EMAIL PROTECTED] Sent: Wednesday, March 14, 2001 4:08 AM Subject: [JAVA3D] How to repaint the J3D scene after an interactive input Hi All,   I have met a problem in updating scence graph (display). In interactive computer graphics, we need to update the screen display after  adding a new graphics primitive. In Java 2D, we can use repaint() mothed. Now, I use SimpleUniverser to setup a virtualUniverse and a Locale, After adding the first 3D shape, I add a Branchgraph to the Universer. The screen can display the scene correctly. However, after inputting another 3D shape from menu, I can not romove the old BranchGraph, and can not update the scene to include the  newly input.  It seems that there is no removeBranchGraph() method in SimpleUniverser object. How can I use Java3D in an interactive way?     Thanks     Sheng Qin