[java3d] Picking in a subtree

[Peter Steiger]

Hello!

I have a TransformGroup A which has a PickRotateBehavior to rotate
all the children of this group. This works fine.

One child is another TransformGroup B, where I added a 
PickTranslateBehavior, to be able to translate all the children
of B.

Unfortunately also A is translated, when I pick an object
of B, instead of translating *only* the objects of B.

So why does this PickTranslateBehavior change the TransformGroup A
and not B?


Any help is very appreciated!

Thanx in advance

Peter


PS: Here's the important part of the code:
  
// ----------------------------------------------------------
     BranchGroup branchGroup = new BranchGroup();

     TransformGroup tg1 = new TransformGroup();
      tg1.setCapability(Node.ENABLE_PICK_REPORTING);
      tg1.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
      tg1.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
     branchGroup.addChild(tg1);

     // a 1x1x1 cube (only edges are drawn)
     tg1.addChild((new CoordinateBox()).getChild());

     BranchGroup bg1 = new BranchGroup();
     tg1.addChild(bg1);

     TransformGroup tg2 = new TransformGroup();
      tg2.setCapability(Node.ENABLE_PICK_REPORTING);
      tg2.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
      tg2.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
     bg1.addChild(tg2);

     tg2.addChild((new Sphere(0.1f, app)));

     PickTranslateBehavior mt =
         new PickTranslateBehavior(bg1,
             canvas,
             new BoundingSphere(new Point3d(1.0, 1.0, 1.0), 0,1),
             PickObject.USE_BOUNDS);

     bg1.addChild(mt);


     PickRotateBehavior br =
         new PickRotateBehavior(branchGroup,
             canvas,
             new BoundingSphere(new Point3d(0.5, 0.5, 0.5), 0.7),
             PickObject.USE_BOUNDS);

     branchGroup.addChild(br);



     branchGroup.compile();
// ----------------------------------------------------------




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