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LongestEdgeT.hh
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42 /*==========================================================================*\
43 * *
44 * $Revision: 410 $ *
45 * $Date: 2010-06-17 12:45:58 +0200 (Do, 17. Jun 2010) $ *
46 * *
47 \*==========================================================================*/
48
53 //=============================================================================
54 //
55 // CLASS LongestEdgeT
56 //
57 //=============================================================================
58
59
60 #ifndef LINEAR_H
61 #define LINEAR_H
62
63 #include <OpenMesh/Tools/Subdivider/Uniform/SubdividerT.hh>
64 #include <OpenMesh/Core/Utils/vector_cast.hh>
65 #include <OpenMesh/Core/Utils/Property.hh>
66 // -------------------- STL
67 #include <vector>
68 #include <queue>
69 #if defined(OM_CC_MIPS)
70 # include <math.h>
71 #else
72 # include <cmath>
73 #endif
74
75
76 //== NAMESPACE ================================================================
77
78 namespace OpenMesh { // BEGIN_NS_OPENMESH
79 namespace Subdivider { // BEGIN_NS_DECIMATER
80 namespace Uniform { // BEGIN_NS_UNIFORM
81
82
83 //== CLASS DEFINITION =========================================================
84
85 template <typename MeshType, typename RealType = float>
86 class CompareLengthFunction {
87 public:
88
89 typedef std::pair<typename MeshType::EdgeHandle, RealType> queueElement;
90
91 bool operator()(const queueElement& t1, const queueElement& t2) // Returns true if t1 is smaller than t2
92 {
93 return (t1.second < t2.second);
94 }
95 };
96
97
104 template <typename MeshType, typename RealType = float>
105 class LongestEdgeT : public SubdividerT<MeshType, RealType>
106 {
107 public:
108
109 typedef RealType real_t;
110 typedef MeshType mesh_t;
111 typedef SubdividerT< mesh_t, real_t > parent_t;
112
113 typedef std::vector< std::vector<real_t> > weights_t;
114 typedef std::vector<real_t> weight_t;
115
116 typedef std::pair< typename mesh_t::EdgeHandle, real_t > queueElement;
117
118 public:
119
120
121 LongestEdgeT() : parent_t()
122 { }
123
124
125 LongestEdgeT( mesh_t& _m) : parent_t(_m)
126 { }
127
128
129 ~LongestEdgeT() {}
130
131
132 public:
133
134
135 const char *name() const { return "Longest Edge Split"; }
136
137 void set_max_edge_length(double _value) {
138 max_edge_length_squared_ = _value * _value;
139 }
140
141 protected:
142
143
144 bool prepare( mesh_t& _m )
145 {
146 return true;
147 }
148
149
150 bool cleanup( mesh_t& _m )
151 {
152 return true;
153 }
154
155
156 bool subdivide( MeshType& _m, size_t _n , const bool _update_points = true)
157 {
158
159 // Sorted queue containing all edges sorted by their decreasing length
160 std::priority_queue< queueElement, std::vector< queueElement > , CompareLengthFunction< mesh_t, real_t > > queue;
161
162 // Build the initial queue
163 // First element should be longest edge
164 typename mesh_t::EdgeIter edgesEnd = _m.edges_end();
165 for ( typename mesh_t::EdgeIter eit = _m.edges_begin(); eit != edgesEnd; ++eit) {
166 const typename MeshType::Point to = _m.point(_m.to_vertex_handle(_m.halfedge_handle(*eit,0)));
167 const typename MeshType::Point from = _m.point(_m.from_vertex_handle(_m.halfedge_handle(*eit,0)));
168
169 real_t length = (to - from).sqrnorm();
170
171 // Only push the edges that need to be split
172 if ( length > max_edge_length_squared_ )
173 queue.push( queueElement(*eit,length) );
174 }
175
176 bool stop = false;
177 while ( !stop && ! queue.empty() ) {
178 queueElement a = queue.top();
179 queue.pop();
180
181 if ( a.second < max_edge_length_squared_ ) {
182 stop = true;
183 break;
184 } else {
185 const typename MeshType::Point to = _m.point(_m.to_vertex_handle(_m.halfedge_handle(a.first,0)));
186 const typename MeshType::Point from = _m.point(_m.from_vertex_handle(_m.halfedge_handle(a.first,0)));
187 const typename MeshType::Point midpoint = static_cast<typename MeshType::Point::value_type>(0.5) * (to + from);
188
189 const typename MeshType::VertexHandle newVertex = _m.add_vertex(midpoint);
190 _m.split(a.first,newVertex);
191
192 for ( typename MeshType::VertexOHalfedgeIter voh_it(_m,newVertex); voh_it.is_valid(); ++voh_it) {
193 typename MeshType::EdgeHandle eh = _m.edge_handle(*voh_it);
194 const typename MeshType::Point to = _m.point(_m.to_vertex_handle(*voh_it));
195 const typename MeshType::Point from = _m.point(_m.from_vertex_handle(*voh_it));
196 real_t length = (to - from).sqrnorm();
197
198 // Only push the edges that need to be split
199 if ( length > max_edge_length_squared_ )
200 queue.push( queueElement(eh,length) );
201
202 }
203 }
204 }
205
206 #if defined(_DEBUG) || defined(DEBUG)
207 // Now we have an consistent mesh!
208 assert( OpenMesh::Utils::MeshCheckerT<mesh_t>(_m).check() );
209 #endif
210
211
212 return true;
213 }
214
215
216 private: // data
217 real_t max_edge_length_squared_;
218
219 };
220
221 } // END_NS_UNIFORM
222 } // END_NS_SUBDIVIDER
223 } // END_NS_OPENMESH
224 #endif
225
OpenMesh::Utils::MeshCheckerT
Check integrity of mesh.
Definition: MeshCheckerT.hh:78
SubdividerT.hh
OpenMesh::Subdivider::Uniform::LongestEdgeT::subdivide
bool subdivide(MeshType &_m, size_t _n, const bool _update_points=true)
Subdivide mesh _m _n times.
Definition: LongestEdgeT.hh:156
OpenMesh::Subdivider::Uniform::LongestEdgeT
Uniform LongestEdgeT subdivision algorithm
Definition: LongestEdgeT.hh:105
OpenMesh::Subdivider::Uniform::LongestEdgeT::name
const char * name() const
Return name of subdivision algorithm.
Definition: LongestEdgeT.hh:135
OpenMesh
Contains all the mesh ingredients like the polygonal mesh, the triangle mesh, different mesh kernels ...
Definition: MeshItems.hh:64
OpenMesh::Subdivider::Uniform::LongestEdgeT::prepare
bool prepare(mesh_t &_m)
Prepare mesh, e.g. add properties.
Definition: LongestEdgeT.hh:144
OpenMesh::Subdivider::Uniform::CompareLengthFunction
Definition: LongestEdgeT.hh:86
OpenMesh::Subdivider::Uniform::LongestEdgeT::cleanup
bool cleanup(mesh_t &_m)
Cleanup mesh after usage, e.g. remove added properties.
Definition: LongestEdgeT.hh:150
OpenMesh::Subdivider::Uniform::SubdividerT
Abstract base class for uniform subdivision algorithms.
Definition: SubdividerT.hh:94