CGAL users discussion list

[wenchao <>]

Dear CGAL developers,

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. 

Can anyone help me find the reason for this trouble? 

Thanks a lot!

Best, 
Wenchao





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