CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

Could you check the value returned by 
CGAL::is_valid_polygon_mesh(my_mesh) called on your mesh before calling
the CGAL function? It might be that the input is not a valid polygon
mesh (non-manifold vertices for example).

Thanks,

Sebastien.



On 9/6/20 6:47 AM, Yaoyu Hu ( via cgal-discuss 
Mailing List) wrote:
> Hi,
>
> I was trying to use CGAL::Polygon_mesh_processing::isotropic_remeshing() 
> to remesh a CGAL::Surface_mesh. However, I got the following error message:
>
> ========== Error message begins. ==========
>
> terminate called after throwing an instance of 'CGAL::Assertion_exception'
>    what():  CGAL ERROR: assertion violation!
> Expr: is_valid_polygon_mesh(mesh_)
> File: 
> /home/yaoyu/Libraries/cgal/Polygon_mesh_processing/include/CGAL/Polygon_mesh_processing/internal/Isotropic_remeshing/remesh_impl.h
> Line: 1037
>
> ========== Error message ends. ==========
>
> I was trying the code listed at 
> https://doc.cgal.org/latest/Polygon_mesh_processing/Polygon_mesh_processing_2isotropic_remeshing_example_8cpp-example.html 
> and I enclosed the source file. I am not sure about the reason why CGAL 
> thinks the Surface_mesh is not a valid polygon mesh.
>
> The input mesh is in PLY format and you could find the file at 
> https://drive.google.com/file/d/1Z9AMfRnbkJGmDuUOc7ZAdMAvbhhhx_Vn/view?usp=sharing
>
> One thing that might be interesting is that if I use the CGAL Polyhedron 
> Demo program to load and do the isotropic remeshing, no errors are 
> encountered.
>
> Any comments are appreciated.
>
> Thank you!
>
> Yaoyu
>
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