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[Gillian Ng <>]

I've been looking into the Nef_Polyhedron_3 class, but I don't quite
understand how to populate it with data. The data I have consists of indices
and vertices. This would work alright with Polyhedron_3, but Nef seems
different. I have considered writing it to an OBJ and then reading that OBJ
into the Nef, as it seems to be the simplest way, but I'm not sure. 

The other thing I can't seem to find is, what does the following snippet
mean? They're everywhere in the examples.

    Nef_polyhedron_3 N;
    std::cin >> N; // <-- What's being cin'd? 

Help? Thanks a lot guys. 

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