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[Icek <>]

Hello, Im trying to construct Polyhedron from my mesh structure. And then
NefPolyhedron from polyhedron. I found that I have to use Incremental
builder, but resulting polyhedron is_closed() is always false, even when my
mesh is simple cube. And NefPolyheron requires closed polyhedron, so is this
piece of code right? Or how do I create polyhedron from points? 

template <class HDS> class PolyhedronFromMesh : public
CGAL::Modifier_base<HDS> 
{
public:
    PolyhedronFromMesh(const Mesh & mesh) : _mesh(mesh)
    {

    }

    void operator()( HDS& hds)
    {
        // Postcondition: `hds' is a valid polyhedral surface.
        CGAL::Polyhedron_incremental_builder_3<HDS> B( hds, false);

        typedef typename HDS::Vertex   Vertex;
        typedef typename Vertex::Point Point;

        unsigned int nPoints = _mesh.Points.size();
        unsigned int nFacets =  _mesh.Indices.size() ? _mesh.Indices.size()
/ 3 : nPoints / 3;

        B.begin_surface(nPoints,nFacets);

        for(unsigned int i = 0; i < nPoints; i++)
        {
            Vec3 p = _mesh.Points[i];           
            B.add_vertex(Point(p.x,p.y, p.z));
        }

        if(_mesh.Indices.size())
            for(unsigned int i=0; i < _mesh.Indices.size(); i+=3)
            {
            B.begin_facet();
            B.add_vertex_to_facet((long unsigned int)_mesh.Indices[i]);
            B.add_vertex_to_facet((long unsigned int)_mesh.Indices[i+1]);
            B.add_vertex_to_facet((long unsigned int)_mesh.Indices[i+2]);
            B.end_facet();
        }
        else
            for(unsigned int i=0; i < _mesh.Indices.size(); i+=3)
            {
            B.begin_facet();
            B.add_vertex_to_facet( i);
            B.add_vertex_to_facet( i+1);
            B.add_vertex_to_facet( i+2);
            B.end_facet();
        }

        B.end_surface();
    }

    const Mesh & _mesh;
};

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