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meshDualT.hh
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/*
Compute the dual of a mesh:
- each face of the original mesh is replaced by a vertex at the center of gravity of the vertices of the face
- each vertex of the original mesh is replaced by a face containing the dual vertices of its primal adjacent faces
Changelog:
- 29 mar 2010: initial work
Programmer:
Clement Courbet - clement.courbet@ecp.fr
(c) Clement Courbet 2010
*/
#ifndef OPENMESH_MESH_DUAL_H
#define OPENMESH_MESH_DUAL_H
//== INCLUDES =================================================================
// -------------------- STL
#include <vector>
#if defined(OM_CC_MIPS)
# include <math.h>
#else
# include <cmath>
#endif
#include <OpenMesh/Core/Mesh/PolyMesh_ArrayKernelT.hh>
#include <OpenMesh/Core/Utils/Property.hh>
//== FORWARDDECLARATIONS ======================================================
//== NAMESPACES ===============================================================
namespace OpenMesh {
namespace Util {
//== Function DEFINITION =========================================================
template <typename MeshTraits>
PolyMesh_ArrayKernelT<MeshTraits>* MeshDual (PolyMesh_ArrayKernelT<MeshTraits> &primal)
{
PolyMesh_ArrayKernelT<MeshTraits>* dual = new PolyMesh_ArrayKernelT<MeshTraits>();
//we will need to reference which vertex in the dual is attached to each face in the primal
//and which face of the dual is attached to each vertex in the primal.
FPropHandleT< typename PolyMesh_ArrayKernelT<MeshTraits>::VertexHandle > primalToDual;
primal.add_property(primalToDual);
//for each face in the primal mesh, add a vertex at the center of gravity of the face
for(typename PolyMesh_ArrayKernelT<MeshTraits>::ConstFaceIter fit=primal.faces_begin(); fit!=primal.faces_end(); ++fit)
{
typename PolyMesh_ArrayKernelT<MeshTraits>::Point centerPoint(0,0,0);
typename PolyMesh_ArrayKernelT<MeshTraits>::Scalar degree= 0.0;
for(typename PolyMesh_ArrayKernelT<MeshTraits>::ConstFaceVertexIter vit=primal.cfv_iter(*fit); vit.is_valid(); ++vit, ++degree) {
centerPoint += primal.point(*vit);
}
assert(degree!=0);
centerPoint /= degree;
primal.property(primalToDual, *fit) = dual->add_vertex(centerPoint);
}
//for each vertex in the primal, add a face in the dual
std::vector< typename PolyMesh_ArrayKernelT<MeshTraits>::VertexHandle > face_vhandles;
for(typename PolyMesh_ArrayKernelT<MeshTraits>::ConstVertexIter vit=primal.vertices_begin(); vit!=primal.vertices_end(); ++vit)
{
if(!primal.is_boundary(*vit))
{
face_vhandles.clear();
for(typename PolyMesh_ArrayKernelT<MeshTraits>::ConstVertexFaceIter fit=primal.cvf_iter(*vit); fit.is_valid(); ++fit)
face_vhandles.push_back(primal.property(primalToDual, *fit));
dual->add_face(face_vhandles);
}
}
primal.remove_property(primalToDual);
return dual;
}
//=============================================================================
} // namespace Util
} // namespace OpenMesh
//=============================================================================
//=============================================================================
#endif // OPENMESH_MESH_DUAL_H defined
//=============================================================================
OpenMesh
Contains all the mesh ingredients like the polygonal mesh, the triangle mesh, different mesh kernels ...
Definition MeshItems.hh:59
OpenMesh::PolyMeshT< AttribKernel >::ConstFaceIter
AttribKernel::ConstFaceIter ConstFaceIter
Definition PolyMeshT.hh:151
OpenMesh::PolyMeshT< AttribKernel >::Scalar
AttribKernel::Scalar Scalar
Definition PolyMeshT.hh:110
OpenMesh::PolyMeshT< AttribKernel >::ConstFaceVertexIter
AttribKernel::ConstFaceVertexIter ConstFaceVertexIter
Definition PolyMeshT.hh:177
OpenMesh::PolyMeshT< AttribKernel >::ConstVertexFaceIter
AttribKernel::ConstVertexFaceIter ConstVertexFaceIter
Definition PolyMeshT.hh:176
OpenMesh::PolyMeshT< AttribKernel >::ConstVertexIter
AttribKernel::ConstVertexIter ConstVertexIter
Definition PolyMeshT.hh:148
OpenMesh::PolyMeshT< AttribKernel >::Point
AttribKernel::Point Point
Definition PolyMeshT.hh:112