CGAL users discussion list

["Laurent Rineau (GeometryFactory)" <>]

On Tuesday 31 March 2009 00:26:37 Joe C wrote:
> Thanks, Peter. I also found that there are two degenerated triangles for my
> input data. So I guess CGAL's polyhedron_3 still considers this as closed
> and valid even though it has degeneated cases. I suggest that the two
> methods : is_close() or is_valid() return false with some error message so
> the user is aware that the polyhedron with degenerated triangles is not
> allowed to converted to Nef_polyhedron.

Polyhedron_3 and Nef_polyhedron_3 are two different packages. I do not see why the is_valid() function of Polyhedron_3 should be aware of the prerequisites of a function of Nef_polyhedron_3.

That said, there should be a function in Nef_polyhedron_3 that helps users to check prerequisites of a conversion from a Polyhedron_3. The Polyhedron_3::is_closed() is not sufficient.

--
Laurent Rineau, PhD
Engineer at GeometryFactory
http://www.geometryfactory.com/