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My problem exactly is that I need the difference of some figures, and 
sometimes
the difference is not a Nef Polyhedron simple, and I can't pass it to a
Polyhedron and save it as a OFF format.

Must I do another conversor to .OFF directly from Nef_Polyhedron_3, or can I
pass the Nef Polyedron (no simple) to a group of polyhedros (for example)? In
this case I could obtain the .OFF easily.

Thanks for your answers.