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Simple Java 3D - Unable to apply Transform3D to rotate object

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Taarik Z. Rahaman

Posts: 1
Nickname: tzrick
Registered: Jan, 2005

Simple Java 3D - Unable to apply Transform3D to rotate object

Posted: Jan 25, 2005 3:10 PM

Hello experts! Sorry about the formatting...

I have a project that has been quite frustrating to me. Please help me get the rotation work...

Below is a function that is called by clicking on a JButton. This code works:

private void zoom(boolean in) {
       Transform3D zoom = world3d.zoom;
       zoom.set(zoom.getScale()+(in ? -0.2 : 0.2));
       world3d.zoomg.setTransform(zoom);                       // access member variable
  }

However, the procedure doesn't work for rotation as follows:

private void rotateX(boolean cw) {
       Transform3D rot = world3d.rotateX;
       xrot = xrot + (cw ? 0.1 : -0.1);
       rot.rotX (xrot);
       world3d.tgRotateX.setTransform(rot);                    // access member variable
  }

The constructor for the World3D class is as follows:

public World3D (Canvas3D canvas3d) {

    mainShuttle = new Shuttle ();     // returns BranchGroup with 3D object

    Transform3D translate = new Transform3D ();
    translate.set (new Vector3f (0.15f, 0.0f, 0.7f));     // Translate to fit on screen
    TransformGroup tg = new TransformGroup (translate);

    zoom.set (0.5);
    zoomg = new TransformGroup (zoom); // Allow for dynamic zoom
    zoomg.setCapability (TransformGroup.ALLOW_TRANSFORM_READ);
    zoomg.setCapability (TransformGroup.ALLOW_TRANSFORM_WRITE);
    
    tgRotateX = new TransformGroup (rotateX); // Allow for dynamic x-rotation 
    tgRotateX.setCapability (TransformGroup.ALLOW_TRANSFORM_READ);
    tgRotateX.setCapability (TransformGroup.ALLOW_TRANSFORM_WRITE);
  
    zoomg.addChild (mainShuttle.getBG ());
    tg.addChild (zoomg);
    BranchGroup mainScene = new BranchGroup ();
    tgRotateX.addChild (tg);
    mainScene.addChild (tgRotateX);
    mainScene.compile ();

    SimpleUniverse simpleU = new SimpleUniverse (canvas3d);

    // This moves the ViewPlatform back a bit so the
    // objects in the scene can be viewed.
    simpleU.getViewingPlatform ().setNominalViewingTransform ();

    simpleU.addBranchGraph (mainScene);
  }

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