get_boundary.h

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#ifndef PCL_GEOMETRY_GET_BOUNDARY_H
#define PCL_GEOMETRY_GET_BOUNDARY_H

#include <vector>

namespace pcl
{
  namespace geometry
  {
    template <class MeshT> void
    getBoundBoundaryHalfEdges (const MeshT&                                   mesh,
                               std::vector <typename MeshT::HalfEdgeIndices>& boundary_he_collection,
                               const size_t                                   expected_size = 3)
    {
      typedef MeshT                                            Mesh;
      typedef typename Mesh::HalfEdgeIndex                     HalfEdgeIndex;
      typedef typename Mesh::HalfEdgeIndices                   HalfEdgeIndices;
      typedef typename Mesh::InnerHalfEdgeAroundFaceCirculator IHEAFC;

      boundary_he_collection.clear ();

      HalfEdgeIndices boundary_he; boundary_he.reserve (expected_size);
      std::vector <bool> visited (mesh.sizeEdges (), false);
      IHEAFC circ, circ_end;

      for (HalfEdgeIndex i (0); i<HalfEdgeIndex (mesh.sizeHalfEdges ()); ++i)
      {
        if (mesh.isBoundary (i) && !visited [pcl::geometry::toEdgeIndex (i).get ()])
        {
          boundary_he.clear ();

          circ     = mesh.getInnerHalfEdgeAroundFaceCirculator (i);
          circ_end = circ;
          do
          {
            visited [pcl::geometry::toEdgeIndex (circ.getTargetIndex ()).get ()] = true;
            boundary_he.push_back (circ.getTargetIndex ());
          } while (++circ != circ_end);

          boundary_he_collection.push_back (boundary_he);
        }
      }
    }

  } // End namespace geometry
} // End namespace pcl

#endif // PCL_GEOMETRY_GET_BOUNDARY_H