CGAL users discussion list

[Iasonm <>]

Hello,
given a CGAL::Surface_Mesh<SomeKernel> what is the easiest way to extract
mesh "connectivity" vectors like for example an edge_to_face vector of which
the ith position holds another vector which holds the indices of all the
faces that are adjacent to the ith edge?

I tried:
 for (CGALSurfaceMesh::edge_index ei : m_M.edges()) {
      CGALSurfaceMesh::face_index f0(m_M.halfedge(ei, 0)); 
      CGALSurfaceMesh::face_index f1(m_M.halfedge(ei, 1));
      std::vector<size_t> facesOfEdge{size_t(f0), size_t(f1)};
      edge_to_face[size_t(ei)] = facesOfEdge;
    }
the above gives face indices that are as big as twice the number of faces in
the mesh. For example when the mesh has 90 faces I would get using the above
indices up to 179. Why does the above not work and could you suggest me
another way to get the needed connectivity vector?



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