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[Marek <>]

I input it as polyhedron from file door.off that is uploaded near beginning
of my first post in this threat.

    Polyhedron polyhedron;

    std::ifstream input( input_filename );
    if(input.is_open())
    {
        input >> polyhedron;
        if(!polyhedron.is_pure_triangle())
         err = true;

        Mesh_domain domain(polyhedron);

Then, because domain is concept of:
typedef CGAL::Polyhedral_mesh_domain_with_features_3<K> Mesh_domain;

i can call domain.detect_features();

to detect 1d features




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