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[Joe C <>]

But before I output the polyhedron to .off file, is_valid() returns true. Is it possible that the validity is compromised when writing a polyhedron to .off file? If yes, any approach available to prevent this?

On Tue, Jan 5, 2010 at 9:42 AM, Laurent Rineau (GeometryFactory) <> wrote:

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/

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