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meshDualT.hh
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40 * ========================================================================= */
41
42 /*===========================================================================*\
43 * *
44 * $Revision$ *
45 * $Date$ *
46 * *
47 \*===========================================================================*/
48
49 /*
50 Compute the dual of a mesh:
51 - each face of the original mesh is replaced by a vertex at the center of gravity of the vertices of the face
52 - each vertex of the original mesh is replaced by a face containing the dual vertices of its primal adjacent faces
53
54 Changelog:
55 - 29 mar 2010: initial work
56
57 Programmer:
58 Clement Courbet - clement.courbet@ecp.fr
59
60 (c) Clement Courbet 2010
61 */
62
63 #ifndef OPENMESH_MESH_DUAL_H
64 #define OPENMESH_MESH_DUAL_H
65
66 //== INCLUDES =================================================================
67
68 // -------------------- STL
69 #include <vector>
70 #if defined(OM_CC_MIPS)
71 # include <math.h>
72 #else
73 # include <cmath>
74 #endif
75
76 #include <OpenMesh/Core/Mesh/PolyMesh_ArrayKernelT.hh>
77 #include <OpenMesh/Core/Utils/Property.hh>
78
79 //== FORWARDDECLARATIONS ======================================================
80
81 //== NAMESPACES ===============================================================
82
83
84 namespace OpenMesh {
85 namespace Util {
86
87 //== Function DEFINITION =========================================================
88
94 template <typename MeshTraits>
95 PolyMesh_ArrayKernelT<MeshTraits>* MeshDual (PolyMesh_ArrayKernelT<MeshTraits> &primal)
96 {
97 PolyMesh_ArrayKernelT<MeshTraits>* dual = new PolyMesh_ArrayKernelT<MeshTraits>();
98
99 //we will need to reference which vertex in the dual is attached to each face in the primal
100 //and which face of the dual is attached to each vertex in the primal.
101
102 FPropHandleT< typename PolyMesh_ArrayKernelT<MeshTraits>::VertexHandle > primalToDual;
103 primal.add_property(primalToDual);
104
105 //for each face in the primal mesh, add a vertex at the center of gravity of the face
106 for(typename PolyMesh_ArrayKernelT<MeshTraits>::ConstFaceIter fit=primal.faces_begin(); fit!=primal.faces_end(); ++fit)
107 {
108 typename PolyMesh_ArrayKernelT<MeshTraits>::Point centerPoint(0,0,0);
109 typename PolyMesh_ArrayKernelT<MeshTraits>::Scalar degree= 0.0;
110 for(typename PolyMesh_ArrayKernelT<MeshTraits>::ConstFaceVertexIter vit=primal.cfv_iter(*fit); vit.is_valid(); ++vit, ++degree)
111 centerPoint += primal.point(*vit);
112 assert(degree!=0);
113 centerPoint /= degree;
114 primal.property(primalToDual, *fit) = dual->add_vertex(centerPoint);
115 }
116
117 //for each vertex in the primal, add a face in the dual
118 std::vector< typename PolyMesh_ArrayKernelT<MeshTraits>::VertexHandle > face_vhandles;
119 for(typename PolyMesh_ArrayKernelT<MeshTraits>::ConstVertexIter vit=primal.vertices_begin(); vit!=primal.vertices_end(); ++vit)
120 {
121 if(!primal.is_boundary(*vit))
122 {
123 face_vhandles.clear();
124 for(typename PolyMesh_ArrayKernelT<MeshTraits>::ConstVertexFaceIter fit=primal.cvf_iter(*vit); fit.is_valid(); ++fit)
125 face_vhandles.push_back(primal.property(primalToDual, *fit));
126 dual->add_face(face_vhandles);
127 }
128 }
129
130 primal.remove_property(primalToDual);
131
132 return dual;
133
134 }
135
136 //=============================================================================
137 } // namespace Util
138 } // namespace OpenMesh
139 //=============================================================================
140
141 //=============================================================================
142 #endif // OPENMESH_MESH_DUAL_H defined
143 //=============================================================================
144
145
OpenMesh
Definition: MeshItems.hh:64