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meshDualT.hh
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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
84namespace OpenMesh {
85namespace Util {
86
87//== Function DEFINITION =========================================================
88
94template <typename MeshTraits>
95PolyMesh_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);
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
Contains all the mesh ingredients like the polygonal mesh, the triangle mesh, different mesh kernels ...
Definition: MeshItems.hh:64
Kernel::ConstFaceIter ConstFaceIter
Scalar type.
Definition: PolyMeshT.hh:154
Kernel::Scalar Scalar
Scalar type.
Definition: PolyMeshT.hh:113
Kernel::ConstFaceVertexIter ConstFaceVertexIter
Circulator.
Definition: PolyMeshT.hh:180
Kernel::ConstVertexFaceIter ConstVertexFaceIter
Circulator.
Definition: PolyMeshT.hh:179
Kernel::ConstVertexIter ConstVertexIter
Scalar type.
Definition: PolyMeshT.hh:151
Kernel::Point Point
Coordinate type.
Definition: PolyMeshT.hh:115

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