| OpenMesh

meshDualT.hh
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41
42 /*
43 Compute the dual of a mesh:
44 - each face of the original mesh is replaced by a vertex at the center of gravity of the vertices of the face
45 - each vertex of the original mesh is replaced by a face containing the dual vertices of its primal adjacent faces
46
47 Changelog:
48 - 29 mar 2010: initial work
49
50 Programmer:
51 Clement Courbet - clement.courbet@ecp.fr
52
53 (c) Clement Courbet 2010
54 */
55
56 #ifndef OPENMESH_MESH_DUAL_H
57 #define OPENMESH_MESH_DUAL_H
58
59 //== INCLUDES =================================================================
60
61 // -------------------- STL
62 #include <vector>
63 #if defined(OM_CC_MIPS)
64 # include <math.h>
65 #else
66 # include <cmath>
67 #endif
68
69 #include <OpenMesh/Core/Mesh/PolyMesh_ArrayKernelT.hh>
70 #include <OpenMesh/Core/Utils/Property.hh>
71
72 //== FORWARDDECLARATIONS ======================================================
73
74 //== NAMESPACES ===============================================================
75
76
77 namespace OpenMesh {
78 namespace Util {
79
80 //== Function DEFINITION =========================================================
81
87 template <typename MeshTraits>
88 PolyMesh_ArrayKernelT<MeshTraits>* MeshDual (PolyMesh_ArrayKernelT<MeshTraits> &primal)
89 {
90 PolyMesh_ArrayKernelT<MeshTraits>* dual = new PolyMesh_ArrayKernelT<MeshTraits>();
91
92 //we will need to reference which vertex in the dual is attached to each face in the primal
93 //and which face of the dual is attached to each vertex in the primal.
94
95 FPropHandleT< typename PolyMesh_ArrayKernelT<MeshTraits>::VertexHandle > primalToDual;
96 primal.add_property(primalToDual);
97
98 //for each face in the primal mesh, add a vertex at the center of gravity of the face
99 for(typename PolyMesh_ArrayKernelT<MeshTraits>::ConstFaceIter fit=primal.faces_begin(); fit!=primal.faces_end(); ++fit)
100 {
101 typename PolyMesh_ArrayKernelT<MeshTraits>::Point centerPoint(0,0,0);
102 typename PolyMesh_ArrayKernelT<MeshTraits>::Scalar degree= 0.0;
103 for(typename PolyMesh_ArrayKernelT<MeshTraits>::ConstFaceVertexIter vit=primal.cfv_iter(*fit); vit.is_valid(); ++vit, ++degree)
104 centerPoint += primal.point(*vit);
105 assert(degree!=0);
106 centerPoint /= degree;
107 primal.property(primalToDual, *fit) = dual->add_vertex(centerPoint);
108 }
109
110 //for each vertex in the primal, add a face in the dual
111 std::vector< typename PolyMesh_ArrayKernelT<MeshTraits>::VertexHandle > face_vhandles;
112 for(typename PolyMesh_ArrayKernelT<MeshTraits>::ConstVertexIter vit=primal.vertices_begin(); vit!=primal.vertices_end(); ++vit)
113 {
114 if(!primal.is_boundary(*vit))
115 {
116 face_vhandles.clear();
117 for(typename PolyMesh_ArrayKernelT<MeshTraits>::ConstVertexFaceIter fit=primal.cvf_iter(*vit); fit.is_valid(); ++fit)
118 face_vhandles.push_back(primal.property(primalToDual, *fit));
119 dual->add_face(face_vhandles);
120 }
121 }
122
123 primal.remove_property(primalToDual);
124
125 return dual;
126
127 }
128
129 //=============================================================================
130 } // namespace Util
131 } // namespace OpenMesh
132 //=============================================================================
133
134 //=============================================================================
135 #endif // OPENMESH_MESH_DUAL_H defined
136 //=============================================================================
137
138
OpenMesh::PolyMeshT::Scalar
Kernel::Scalar Scalar
Scalar type.
Definition: PolyMeshT.hh:110
OpenMesh::PolyMeshT::ConstVertexFaceIter
Kernel::ConstVertexFaceIter ConstVertexFaceIter
Circulator.
Definition: PolyMeshT.hh:176
OpenMesh
Contains all the mesh ingredients like the polygonal mesh, the triangle mesh, different mesh kernels ...
Definition: MeshItems.hh:59
OpenMesh::PolyMeshT::Point
Kernel::Point Point
Coordinate type.
Definition: PolyMeshT.hh:112
OpenMesh::PolyMeshT::ConstFaceVertexIter
Kernel::ConstFaceVertexIter ConstFaceVertexIter
Circulator.
Definition: PolyMeshT.hh:177