CGAL users discussion list

[Liang <>]

Hi all,

Currently I am working on the extension of Polyhedron_3 class. I followed
the example:

===============================================================
#include <CGAL/Simple_cartesian.h>
#include <CGAL/IO/Color.h>
#include <CGAL/Polyhedron_3.h>

// A face type with a color member variable.
template <class Refs>
struct My_face : public CGAL::HalfedgeDS_face_base<Refs> {
    CGAL::Color color;
};

// An items type using my face.
struct My_items : public CGAL::Polyhedron_items_3 {
    template <class Refs, class Traits>
    struct Face_wrapper {
        typedef My_face<Refs> Face;
    };
};

typedef CGAL::Simple_cartesian<double>        Kernel;
typedef CGAL::Polyhedron_3&lt;Kernel, My_items&gt;  Polyhedron;
typedef Polyhedron::Halfedge_handle           Halfedge_handle;

int main() {
    Polyhedron P;
    Halfedge_handle h = P.make_tetrahedron();
    h->facet()->color = CGAL::RED;
    return 0;
}
===============================================================

The definition part is basically the same as the example's. But in our
situation, we load a model into a Polyhedron variable from an off. file. I
suppose if I can get the Face_handle pointer from this Polyhedron model,
then I will be able to refer to the added attribute of each face in the
model. The problem is how to get that Face_handle pointer?

Thanks,

Liang


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