CGAL users discussion list

[Sebastien Loriot <>]

The problem is most probably TargertObject that is shared (and modified 
between threads). If you make a copy of it in the loop it should be OK.

See also this example:
https://github.com/CGAL/cgal/blob/master/Polygon_mesh_processing/examples/Polygon_mesh_processing/corefinement_parallel_union_meshes.cpp

Best,

Sebastien.

On 3/18/24 21:58, "Biye Yang" ( via cgal-discuss Mailing 
List) wrote:
> Hi, all:
>
>
> I want to compute the interactions between lots of 3D polyhedrons using 
> CGAL. It becomes low efficient when facing hundreds of objects. So I 
> tried to parallel the code with the simple multi-thread OpenMP. But the 
> segmentation fault always occur. Here is the code of the simple case:
>
> #pragma omp_parallel_for
>  for(int i=0; i<Object.size(); i++)
> {
>       CGSurfaceMesh smesh_insect;
>       bool valid_intersect = 
> CGAL::Polygon_mesh_processing::corefine_and_compute_intersection(Object[i], TargertObject, smesh_insect);
> }
>
> I don't know how to figure that out. And do you have any suggestions on 
> improving efficiency when handling hundreds of 3D intersections using CGAL?
> Thanks a lot!
>
> Best wishes,
> Daye
>
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