[JAVA3D] adding a behavior to a viewpoint?

[Dennis Goetz]

What exactly must be done to add a behavior to a viewpoint Transform?

The following is most of the relevant code for what I am trying to do:

    TransformGroup vpTrans;
    SimpleUniverse universe = new SimpleUniverse(canvas3D);
    universe.getViewingPlatform().setNominalViewingTransform();
    universe.addBranchGraph(scene3D);
    ....
    ....
    vpTrans = universe.getViewingPlatform().getViewPlatformTransform();
    CameraBehaviour cameraBehaviour = new CameraBehaviour(vpTrans,20);
    cameraBehaviour.setSchedulingBounds(bounds);
    vpTrans.addChild(cameraBehaviour);

But, when I try to run this, the last line gives the following error:
    javax.media.j3d.RestrictedAccessException: Group: only a BranchGroup
node may be added

Any suggestion on how I would accomplish what I am trying to do?

Thanks,
Dennis Goetz

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