[JAVA3D] absolute Transformations

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hi everyone, i am questioning myself. whether there is a way to get the absolute "Transformation" (e.g. 4x4 Matrix) from one special Node in the tree to actual TransformGroup..   i know the you can get the absolute one from the scenegraph / locale with getLocalToVworld but i want it from a deeper node...   any suggestions ?   greetings Michael Nischt