Point Cloud Library (PCL)  1.14.1-dev
get_boundary.h
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40 
41 #pragma once
42 
43 #include <vector>
44 
45 namespace pcl {
46 namespace geometry {
47 /**
48  * \brief Get a collection of boundary half-edges for the input mesh.
49  * \param[in] mesh The input mesh.
50  * \param[out] boundary_he_collection Collection of boundary half-edges. Each element in
51  * the vector is one connected boundary. The whole boundary is the union of all
52  * elements.
53  * \param [in] expected_size If you already know the size of the longest
54  * boundary you can tell this here. Defaults to 3 (minimum possible boundary).
55  * \author Martin Saelzle
56  * \ingroup geometry
57  */
58 template <class MeshT>
59 void
61  const MeshT& mesh,
62  std::vector<typename MeshT::HalfEdgeIndices>& boundary_he_collection,
63  const std::size_t expected_size = 3)
64 {
65  using Mesh = MeshT;
66  using HalfEdgeIndex = typename Mesh::HalfEdgeIndex;
67  using HalfEdgeIndices = typename Mesh::HalfEdgeIndices;
68  using IHEAFC = typename Mesh::InnerHalfEdgeAroundFaceCirculator;
69 
70  boundary_he_collection.clear();
71 
72  HalfEdgeIndices boundary_he;
73  boundary_he.reserve(expected_size);
74  std::vector<bool> visited(mesh.sizeEdges(), false);
75  IHEAFC circ, circ_end;
76 
77  for (HalfEdgeIndex i(0); i < HalfEdgeIndex(mesh.sizeHalfEdges()); ++i) {
78  if (mesh.isBoundary(i) && !visited[pcl::geometry::toEdgeIndex(i).get()]) {
79  boundary_he.clear();
80 
81  circ = mesh.getInnerHalfEdgeAroundFaceCirculator(i);
82  circ_end = circ;
83  do {
84  visited[pcl::geometry::toEdgeIndex(circ.getTargetIndex()).get()] = true;
85  boundary_he.push_back(circ.getTargetIndex());
86  } while (++circ != circ_end);
87 
88  boundary_he_collection.push_back(boundary_he);
89  }
90  }
91 }
92 
93 } // End namespace geometry
94 } // End namespace pcl
Definition: surface.h:14
int get() const
Get the index.
Definition: mesh_indices.h:101
pcl::detail::MeshIndex< struct HalfEdgeIndexTag > HalfEdgeIndex
Index used to access elements in the half-edge mesh.
Definition: mesh_indices.h:199
void getBoundBoundaryHalfEdges(const MeshT &mesh, std::vector< typename MeshT::HalfEdgeIndices > &boundary_he_collection, const std::size_t expected_size=3)
Get a collection of boundary half-edges for the input mesh.
Definition: get_boundary.h:60
EdgeIndex toEdgeIndex(const HalfEdgeIndex &index)
Convert the given half-edge index to an edge index.
Definition: mesh_indices.h:224