Then I think that this should work:

Get the maxX, minX, maxY, etc of the 3d object.
Group these accordingly to generate 8 3d vertices.
Use camera.screen() to produce 2d screen vertices.
Select the appropriate ones to produce a 2d polygon.

i think that such procedure is used in one of the methods of
ReflectivePlane.as, take a look.

hope it helps!

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