CGAL users discussion list

["Riedel, Torge" <>]

Hi,

 

I tried to compute a convex hull of a mesh, but I get compilation errors and do not know how to fix. Here is my code:

 

   typedef CGAL::Simple_cartesian<double> K;

  typedef CGAL::Surface_mesh<K::Point_3> Mesh;

 

   std::vector< CGAL::cpp11::array<double, 3> > points;

   std::vector< CGAL::cpp11::array<int, 3> > triangles;

   CGAL::read_STL(input, points, triangles);

 

   CGAL::Polygon_mesh_processing::orient_polygon_soup(points, triangles);

 

   Mesh m;

   CGAL::Polygon_mesh_processing::polygon_soup_to_polygon_mesh(points, triangles, m);

 

   Mesh sm_convex;

   CGAL::convex_hull_3(m.vertices_begin(), m.vertices_end(), sm_convex);

 

   std::cout << " i Points: " << sm_convex.number_of_vertices() << " Triangles: " << sm_convex.number_of_faces() << std::endl;

 

I get the following compilation errors:

 

1>C:\Evaluation\MeshFW\cgal.org\CGAL-4.11.1\include\CGAL/convex_hull_3.h(903): error C2976: 'CGAL::internal::Convex_hull_3::Default_traits_for_Chull_3': too few template arguments

1>  C:\Evaluation\MeshFW\cgal.org\CGAL-4.11.1\include\CGAL/convex_hull_3.h(72): note: see declaration of 'CGAL::internal::Convex_hull_3::Default_traits_for_Chull_3'

1>  main.cpp(114): note: see reference to function template instantiation 'void CGAL::convex_hull_3<CGAL::Surface_mesh<CGAL::Point_3<Kernel_>>::Index_iterator<CGAL::Surface_mesh<CGAL::Point_3<Kernel_>>::Vertex_index>,Mesh>(InputIterator,InputIterator,Polyhedron_3 &)' being compiled

1>          with

1>          [

1>              Kernel_=CGAL::Epick,

1>              InputIterator=CGAL::Surface_mesh<CGAL::Point_3<CGAL::Epick>>::Index_iterator<CGAL::Surface_mesh<CGAL::Point_3<CGAL::Epick>>::Vertex_index>,

1>              Polyhedron_3=Mesh

1>          ]

1>  C:\Evaluation\MeshFW\cgal.org\boost_1_66_0\boost/bind/placeholders.hpp(54): note: see reference to class template instantiation 'boost::arg<9>' being compiled

1>  C:\Evaluation\MeshFW\cgal.org\boost_1_66_0\boost/bind/placeholders.hpp(53): note: see reference to class template instantiation 'boost::arg<8>' being compiled

1>  C:\Evaluation\MeshFW\cgal.org\boost_1_66_0\boost/bind/placeholders.hpp(52): note: see reference to class template instantiation 'boost::arg<7>' being compiled

1>  C:\Evaluation\MeshFW\cgal.org\boost_1_66_0\boost/bind/placeholders.hpp(51): note: see reference to class template instantiation 'boost::arg<6>' being compiled

1>  C:\Evaluation\MeshFW\cgal.org\boost_1_66_0\boost/bind/placeholders.hpp(50): note: see reference to class template instantiation 'boost::arg<5>' being compiled

1>  C:\Evaluation\MeshFW\cgal.org\boost_1_66_0\boost/bind/placeholders.hpp(49): note: see reference to class template instantiation 'boost::arg<4>' being compiled

1>  C:\Evaluation\MeshFW\cgal.org\boost_1_66_0\boost/bind/placeholders.hpp(48): note: see reference to class template instantiation 'boost::arg<3>' being compiled

1>  C:\Evaluation\MeshFW\cgal.org\boost_1_66_0\boost/bind/placeholders.hpp(47): note: see reference to class template instantiation 'boost::arg<2>' being compiled

1>  C:\Evaluation\MeshFW\cgal.org\boost_1_66_0\boost/bind/placeholders.hpp(46): note: see reference to class template instantiation 'boost::arg<1>' being compiled

1>C:\ Evaluation\MeshFW\cgal.org\CGAL-4.11.1\include\CGAL/convex_hull_3.h(903): error C2955: 'CGAL::internal::Convex_hull_3::Default_traits_for_Chull_3': use of class template requires template argument list

1>  C:\Evaluation\MeshFW\cgal.org\CGAL-4.11.1\include\CGAL/convex_hull_3.h(72): note: see declaration of 'CGAL::internal::Convex_hull_3::Default_traits_for_Chull_3'

 

In my understanding this is because I passed the vertex iterators to the convex hull function. If I pass iterators of an std::vector of points like the example in the cgal docs does it, it compiles without problems. I was not able to find a way to get iterators to the points of a surface mesh. My challenge is, that the mesh “m” has to be the input source for the complex hull operation. A separate list/vector of the points is not available. So my question is: How to do this? Hopefully without the need to build an extra list of points.

 

Kind regards

Torge

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