CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

Hamid G wrote:
> On 12/6/10 12:41 PM, Sebastien Loriot (GeometryFactory) wrote:
>
>
> > CGAL::Cartesian_converter<K1,K2> converter;
> >
> > K1::Point_3 p_k1(1,2,3);
> > K2::Point_3 p_k2 = converter( p_k1 );
>
> Thanks for this, I really need to try it.
>
> > Can the assertion happen at any step 1,2,3,4 ? or is it happening always
> > at 3 or 4? does this happen while reading Polyhedra?
>
> No that assertion failure happens only when I use Make_mesh_3, which 
> uses a polyhedron as its input. So it only happens at step 4.
The error is happening because it seems you have at least one degenerate 
triangle (its three vertices are collinear). You can make a
preprocessing step that remove such a triangle and all the incident one.
To retriangulate, take one of the collinear vertices and connect them to 
each vertex of the hole made after removing the triangles.

You can also try not to do 3) to see if it introduces such flat element
but I think it is coming from 2).

S.