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[wenchao <>]

Dear Sebastien,

I encountered a problem when using incremental builder to build a
polyhedron. I used the add_vertex() and add_vertex_to_facet() to construct a
polyhedron from a triangulation. It looks something like: 

//////////////////////////////////////////////////////////////////////////////////
builder.begin_surface(points.size(), points.size()/3,
CGAL::Polyhedron_incremental_builder_3<HDS>::ABSOLUTE_INDEXING);

for (unsigned int i = 0; i < points.size(); i++)
{
        Vertex_handle vh = *builder.add_vertex*(points[i].p);
        vh->group_id = points[i].group_id;
        vh->mp = points[i].prj_pnt;
}

some_function();

builder.end_surface();

//////////////////////////////////////////////////////////////////////////////

void some_function(unsigned int i, unsigned int j, unsigned int k)
{

// some orientation code check here.


b.begin_facet();
b.add_vertex_to_facet(k);
b.add_vertex_to_facet(j);
b.add_vertex_to_facet(i);
b.end_facet();
}
///////////////////////////////////////////////////////////////////////////////

However, after I built this polyhedron P, the validity check
P.is_valid(false, 1) always fails.

More surprisingly, I run the example in
examples/Polyhedron/polyhedron_prog_incr_builder.cpp. I added the same check
in this example. But it still failed.

Could you please help me find the reason for this trouble?

Thanks a lot!

Best,
Wenhao 



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