Hi Lan Wu-Cavener
Thank you very much for the code getting the world coordinates of the view
point into origViewPosition (with a minor adaptation):
         Transform3D currentTransform = new Transform3D();
         Vector3f origViewPosition = new Vector3f();

         TransformGroup vpTransformGroup =
simpleU.getViewingPlatform().getViewPlatformTransform();
         vpTransformGroup .getTransform( currentTransform );
         currentTransform.get( origViewPosition );

Thanks again,
              Antonio Jose Cacho

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