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Converting 3D graphics to 2D polygons


In versions prior to 6 it was possible to convert 3D graphics to 2D like 
this:

Graphics@Graphics3D[Cuboid[{0, 0, 0}]] // Show

This does not work any more in v6.  (Note that I am not trying to embed 
a 3D graphic into a 2D graphic, which can be done with Inset, but I 
would like to get the 2D projection of 3D points, lines and polygons.)

Is there a way to do this in v6?

One can use an ugly hack like
ImportString@ExportString[Graphics3D[Cuboid[]], "PDF"]
but this will break up all the polygons to many little pieces.


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