CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

Could you try replacing CGAL::Simple_cartesian<double> with 
CGAL::Exact_predicates_inexact_constructions_kernel and tell us if you 
still have the issue?

Thanks,

Sebastien.

On 10/16/19 8:43 PM, lulu5 wrote:
> Dear all,
>
> I am new for CGAL and C++. In my project, I would like to generate the curve
> skeleton of closed mesh. Here is my testing codes:
>
> /#define CGAL_EIGEN3_ENABLED
> #include <CGAL/Simple_cartesian.h>
> #include <CGAL/Polyhedron_3.h>
> #include <CGAL/extract_mean_curvature_flow_skeleton.h>
> #include <CGAL/boost/graph/split_graph_into_polylines.h>
> #include <fstream>
> #include <boost/foreach.hpp>
> typedef CGAL::Simple_cartesian<double>                        Kernel;
> typedef Kernel::Point_3                                       Point;
> typedef CGAL::Polyhedron_3<Kernel>                            Polyhedron;
> typedef boost::graph_traits<Polyhedron>::vertex_descriptor
> vertex_descriptor;
> typedef CGAL::Mean_curvature_flow_skeletonization<Polyhedron>
> Skeletonization;
> typedef Skeletonization::Skeleton                             Skeleton;
> typedef Skeleton::vertex_descriptor
> Skeleton_vertex;
> typedef Skeleton::edge_descriptor                             Skeleton_edge;
> //only needed for the display of the skeleton as maximal polylines
>
> // This example extracts a medially centered skeleton from a given mesh.
> int main(int argc, char* argv[])
> {
>         std::ifstream input((argc > 1) ? argv[1] : "data/hand.off");
>         Polyhedron tmesh;
>         input >> tmesh;
>         if (!CGAL::is_triangle_mesh(tmesh))
>         {
>                 std::cout << "Input geometry is not triangulated." << 
> std::endl;
>                 return EXIT_FAILURE;
>         }
>
>         std::cout << CGAL::is_closed(tmesh) << "\n";
>         
>         Skeleton skeleton;
>         CGAL::extract_mean_curvature_flow_skeleton(tmesh, skeleton);
>         
>         return 0;
> }/
>
> It works well with off files provided by CGAL example (for example,
> hand.off <http://cgal-discuss.949826.n4.nabble.com/file/t376145/hand.off>
> ). However, when I create my own geometry ( sweep.off
> <http://cgal-discuss.949826.n4.nabble.com/file/t376145/sweep.off>  ), it
> shows the exception as below:
>
> Exception thrown at 0x000000006AD20FA0 (libgmp-10.dll) in HelloCGAL.exe:
> 0xC0000005: Access violation executing location 0x000000006AD20FA0.
>
> from CGAL::Mpzf::data() in Mpzf.h
>
> After several testing, I think that it is
> CGAL::extract_mean_curvature_flow_skeleton triggers the exception. Does
> anyone know how to deal with this issue?
>
> Any help will be greatly appreciated.
>
>
>
>
> --
> Sent from: http://cgal-discuss.949826.n4.nabble.com/