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[Flash/Papervision3D] DisplayBoject3D's axis aligned bounding box, and why geometry is null?

I am trying to retreive the 2D bounding box for a 3D plane I have on stage. With some research I figured out I should be looking for:

plane.geometry.aabb

But the plane, added on stage and such has null for its geometry? - what am I doing wrong here? I am able to calculateScreenCoords and get screen.x, screen.y. But it would save my day if I would be able to get the actual width an height of the plane displayed on screen.

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