CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

Created this issue to track the pb:

https://github.com/CGAL/cgal/issues/4499

Sebastien.

On 1/31/20 3:52 AM, J. Scheurich wrote:
> Hi,
>
> When i run the following program under Ubuntu 18.04 (X86_64)...
>
> // compile:   g++ -g -O0 readoff_vertexcolor.cpp -lCGAL
> // test data:  https://wdune.ourproject.org/examples/test.off
>
> #include <CGAL/Simple_cartesian.h>
> typedef CGAL::Simple_cartesian<double> Kernel;
> #include <CGAL/Exact_predicates_exact_constructions_kernel.h>
> #include <CGAL/Surface_mesh.h>
> #include <CGAL/Polygon_mesh_processing/corefinement.h>
> #include <CGAL/Polygon_mesh_processing/self_intersections.h>
> #include <CGAL/Polygon_mesh_processing/triangulate_faces.h>
> #include <CGAL/boost/graph/dijkstra_shortest_paths.h>
> #include <CGAL/exceptions.h>
> #include <CGAL/IO/Color.h>
> #include <boost/graph/prim_minimum_spanning_tree.hpp>
> #include <boost/foreach.hpp>
> typedef Kernel::Point_3 Point;
> typedef CGAL::Surface_mesh<Point> Surface;
> typedef CGAL::Surface_mesh<Point> SurfaceMesh;
> typedef CGAL::Color Color;
> typedef Surface::Vertex_index vertex_index;
> typedef boost::graph_traits<Surface>::vertex_descriptor vertex_descriptor;
> typedef boost::graph_traits<Surface>::face_descriptor face_descriptor;
> typedef boost::graph_traits<Surface>::halfedge_descriptor
> halfedge_descriptor;
> std::vector<Point> verts;
> std::vector<Color> cols;
>
> int main(int argc, char **argv)
> {
>      const char *filename = "test.off";
>      std::ifstream input(filename);
>      SurfaceMesh *mesh = new SurfaceMesh();
>
>      if (!input || !(input >> *mesh)) {
>          perror(filename);
>      }
>
>     SurfaceMesh::Property_map<SurfaceMesh::Vertex_index, CGAL::Color>
> vcolors =
>          mesh->property_map<SurfaceMesh::Vertex_index, CGAL::Color >
>          ("v:color").first;
>
>      bool colorExists = mesh->property_map
>          <SurfaceMesh::Vertex_index, CGAL::Color>("v:color").second;
>
>      for (SurfaceMesh::Vertex_index vi : mesh->vertices()) {
>          verts.push_back(mesh->point(vi));
>          if (colorExists )
>              cols.push_back(vcolors[vi]);
>      }
> }
>
> I get:
>
> $ ./a.out
> terminate called after throwing an instance of 'CGAL::Assertion_exception'
>    what():  CGAL ERROR: assertion violation!
> Expr: n > 2
> File: /usr/include/CGAL/boost/graph/Euler_operations.h
> Line: 588
> Aborted (core dumped)
>
> What is wrong ?
>
> so long
> MUFTI