CGAL users discussion list

["J. Scheurich" <>]

> Your test data does not have any color per vertex, they are all per
> face. In the SO message you refer to, it is written
> "[...] If there are colors per face you can access it similarly but by
> searching for the property map called "f:color". [...]"
>
> So you should use a property map like that :
>   SurfaceMesh::Property_map<SurfaceMesh::Face_index, CGAL::Color>
> fcolors =
>         mesh->property_map<SurfaceMesh::Face_index, CGAL::Color >
>         ("f:color").first;

I changed the test program to Face_Index, but still get "color do not
exist" 8-(

$ cat readoff.cpp
    // compile:   g++ -g -O0 readoff.cpp -lCGAL
    // test data: https://people.sc.fsu.edu/~jburkardt/data/off/facecube.off
    // output:
    // $ ./a.out
    // facecube.off: Success
    // color do not exist

    #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 = "facecube.off";
         std::ifstream input(filename);
         SurfaceMesh *mesh = new SurfaceMesh();

         if (!input || !(input >> *mesh)) {
             perror(filename);
         }

         SurfaceMesh::Property_map<SurfaceMesh::Face_index, CGAL::Color>
    vcolors =
             mesh->property_map<SurfaceMesh::Face_index, CGAL::Color >
             ("v:color").first;

         bool colorExists = mesh->property_map
             <SurfaceMesh::Face_index, CGAL::Color>("v:color").second;
         if (colorExists )
             printf("color exists\n");
         else
             printf("color do not exist\n");
    }

Any idears ?

so long
MUFTI