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[Zohar <>]

It seems that Nef can't handle open surfaces?

bool is_manifold(Polyhedron_3 &mesh)
{
        //typedef CGAL::Extended_homogeneous<CGAL::Gmpz> Kernel; // doesn't 
work
with OFF_to_nef_3
        typedef CGAL::Homogeneous<CGAL::Gmpz> Kernel;

        bool is_simple = false;

        CGAL::Nef_polyhedron_3<Kernel> nef;
        stringstream ss;
        //ss.precision(50); // would slow down?
        ss << mesh;
        CGAL::OFF_to_nef_3(ss, nef);

/* A simple test that fails (no facets) if we get the poly back.
ofstream ofs("/8/aa.off");
CGAL::Polyhedron_3<Kernel> poly;
nef.convert_to_polyhedron(poly);
ofs << poly;
*/

        is_simple = nef.is_simple();

        return is_simple;
}



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