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Re: [cgal-discuss] Crash on converting Polyhedron_3 to Nef_polyhedron_3 on an OFF input.
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- From: Gilbert Bernstein <>
- To:
- Subject: Re: [cgal-discuss] Crash on converting Polyhedron_3 to Nef_polyhedron_3 on an OFF input.
- Date: Sat, 12 Jan 2008 20:46:37 -0600
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Stephen,
The mesh you're trying to read in is non-manifold. This is probably why it is not working. Inside of the triangular prism is a second triangular prism sharing part of a face. The surface represented itself is non-manifold, and your data file contains T-Junctions, so the connectivity of the mesh isn't made explicit. One or both of these problems might be the cause of a bad conversion.
If you check the examples folder, there is a program called "complex_construction.cpp" It demonstrates the use of the following function:
#include<CGAL/OFF_to_nef_3.h>
Nef_3 N;
std::size_t discarded = CGAL::OFF_to_nef_3 (std::cin, N, true);
discarded contains the number of facets of the model which were discarded by the conversion process. You might want to try running the model through complex_construction and see what happens.
-- Gilbert
On Jan 12, 2008, at 7:47 PM, Stephen Wong wrote:
Hi there,
On this seemingly innocent input solid in the form of a OFF file, CGAL's Nef_polyhedron_3 constructor using Polyhedron_3 crashes. I believe that the solid represented by the OFF file is valid based on the specification (you can see the model in geomview or any other OFF viewer). I caused this crash by modifying the Nef_3.sln's interface_polyhedron:
Polyhedron P ;
std::ifstream fin( "Triangle - Copy.off" ) ;
fin >> P ;
if ( P.is_closed() && P.is_valid() )
{
Nef_polyhedron_3 N1( poly ) ;
}
Thanks,
Stephen
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<Triangle - Copy.off>
- [cgal-discuss][Nef_polyhedron] How to convert a Nef_polyhedron_3 into a Nef_polyhedron_2 if meaningful, LoadCom, 01/07/2008
- Re: [cgal-discuss][Nef_polyhedron] How to convert a Nef_polyhedron_3 into a Nef_polyhedron_2 if meaningful, Peter Hachenberger, 01/08/2008
- Re: Re: [cgal-discuss][Nef_polyhedron] How to convert aNef_polyhedron_3 into a Nef_polyhedron_2 if meaningful, LoadCom, 01/09/2008
- Re: Re: [cgal-discuss][Nef_polyhedron] How to convert aNef_polyhedron_3 into a Nef_polyhedron_2 if meaningful, Peter Hachenberger, 01/10/2008
- Re: [cgal-discuss][Nef_polyhedron] How to convertaNef_polyhedron_3 into a Nef_polyhedron_2 if meaningful, Max, 01/11/2008
- [cgal-discuss]Aff_transformation_3 Plane_3::transform_to_2d() const;, Max, 01/12/2008
- Re: [cgal-discuss]Aff_transformation_3 Plane_3::transform_to_2d() const;, Ashwin Nanjappa, 01/16/2008
- Crash on converting Polyhedron_3 to Nef_polyhedron_3 on an OFF input., Stephen Wong, 01/13/2008
- Re: [cgal-discuss] Crash on converting Polyhedron_3 to Nef_polyhedron_3 on an OFFinput., Max, 01/13/2008
- Re: [cgal-discuss] Crash on converting Polyhedron_3 to Nef_polyhedron_3 on an OFF input., Gilbert Bernstein, 01/13/2008
- RE: [cgal-discuss] Crash on converting Polyhedron_3 to Nef_polyhedron_3 on an OFF input., Stephen Wong, 01/13/2008
- Re: [cgal-discuss] Crash on converting Polyhedron_3 to Nef_polyhedron_3 on an OFF input., Gilbert Bernstein, 01/14/2008
- RE: [cgal-discuss] Crash on converting Polyhedron_3 to Nef_polyhedron_3 on an OFF input., Stephen Wong, 01/14/2008
- RE: [cgal-discuss] Crash on converting Polyhedron_3 to Nef_polyhedron_3 on an OFF input., Stephen Wong, 01/13/2008
- Re: [cgal-discuss] Crash on converting Polyhedron_3 to Nef_polyhedron_3 on an OFF input., Peter Hachenberger, 01/14/2008
- Re: [cgal-discuss] Crash on converting Polyhedron_3 to Nef_polyhedron_3 on an OFF input., Gilbert Bernstein, 01/14/2008
- Re: Re: [cgal-discuss][Nef_polyhedron] How to convert aNef_polyhedron_3 into a Nef_polyhedron_2 if meaningful, Peter Hachenberger, 01/10/2008
- Re: Re: [cgal-discuss][Nef_polyhedron] How to convert aNef_polyhedron_3 into a Nef_polyhedron_2 if meaningful, LoadCom, 01/09/2008
- Re: [cgal-discuss][Nef_polyhedron] How to convert a Nef_polyhedron_3 into a Nef_polyhedron_2 if meaningful, Peter Hachenberger, 01/08/2008
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