CGAL users discussion list

[lulu5 <>]

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. 




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