CGAL users discussion list

["Laurent Rineau (GeometryFactory)" <>]

On Tuesday 05 January 2010 18:31:47 Joe C wrote:
> Can is_valid() tell this (returning false)? The polyhedron
> intersect_poly_1.off was the output of a polyhedron which shows true when
> running against is_valid().

Yes, as far as I know the is_valid function of the CGAL polyhedron class only 
checks the combinatorial integrity. But other algorithms of CGAL (such as the 
conversion from a regular polyhedron to a nef polyhedron) may need more. In 
your case, I have seen overlapping facets. I am not surprised that the 
constructor of Nef_3 cannot deal with that sort of data.

-- 
Laurent Rineau, PhD
R&D Engineer at GeometryFactory           http://www.geometryfactory.com/
Release Manager of the CGAL Project       http://www.cgal.org/