| OpenMesh

PolyMeshT_impl.hh
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41
42
43
44
45 //=============================================================================
46 //
47 // CLASS PolyMeshT - IMPLEMENTATION
48 //
49 //=============================================================================
50
51
52 #define OPENMESH_POLYMESH_C
53
54
55 //== INCLUDES =================================================================
56
57 #include <OpenMesh/Core/Mesh/PolyMeshT.hh>
58 #include <OpenMesh/Core/Geometry/LoopSchemeMaskT.hh>
59 #include <OpenMesh/Core/Utils/GenProg.hh>
60 #include <OpenMesh/Core/Utils/vector_cast.hh>
61 #include <OpenMesh/Core/Utils/vector_traits.hh>
62 #include <OpenMesh/Core/System/omstream.hh>
63 #include <vector>
64
65
66 //== NAMESPACES ===============================================================
67
68
69 namespace OpenMesh {
70
71 //== IMPLEMENTATION ==========================================================
72
73 template <class Kernel>
74 uint PolyMeshT<Kernel>::find_feature_edges(Scalar _angle_tresh)
75 {
76 assert(Kernel::has_edge_status());//this function needs edge status property
77 uint n_feature_edges = 0;
78 for (EdgeIter e_it = Kernel::edges_begin(); e_it != Kernel::edges_end(); ++e_it)
79 {
80 if (fabs(calc_dihedral_angle(*e_it)) > _angle_tresh)
81 {//note: could be optimized by comparing cos(dih_angle) vs. cos(_angle_tresh)
82 this->status(*e_it).set_feature(true);
83 n_feature_edges++;
84 }
85 else
86 {
87 this->status(*e_it).set_feature(false);
88 }
89 }
90 return n_feature_edges;
91 }
92
93 //-----------------------------------------------------------------------------
94
95 template <class Kernel>
96 typename PolyMeshT<Kernel>::Normal
97 PolyMeshT<Kernel>::calc_face_normal(FaceHandle _fh) const
98 {
99 return calc_face_normal_impl(_fh, typename GenProg::IF<
100 vector_traits<PolyMeshT<Kernel>::Point>::size_ == 3,
101 PointIs3DTag,
102 PointIsNot3DTag
103 >::Result());
104 }
105
106 template <class Kernel>
107 typename PolyMeshT<Kernel>::Normal
108 PolyMeshT<Kernel>::calc_face_normal_impl(FaceHandle _fh, PointIs3DTag) const
109 {
110 assert(this->halfedge_handle(_fh).is_valid());
111 ConstFaceVertexIter fv_it(this->cfv_iter(_fh));
112
113 // Safeguard for 1-gons
114 if (!(++fv_it).is_valid()) return Normal(0, 0, 0);
115
116 // Safeguard for 2-gons
117 if (!(++fv_it).is_valid()) return Normal(0, 0, 0);
118
119 // use Newell's Method to compute the surface normal
120 Normal n(0,0,0);
121 for(fv_it = this->cfv_iter(_fh); fv_it.is_valid(); ++fv_it)
122 {
123 // next vertex
124 ConstFaceVertexIter fv_itn = fv_it;
125 ++fv_itn;
126
127 if (!fv_itn.is_valid())
128 fv_itn = this->cfv_iter(_fh);
129
130 // http://www.opengl.org/wiki/Calculating_a_Surface_Normal
131 const Point a = this->point(*fv_it) - this->point(*fv_itn);
132 const Point b = this->point(*fv_it) + this->point(*fv_itn);
133
134
135 // Due to traits, the value types of normals and points can be different.
136 // Therefore we cast them here.
137 n[0] += static_cast<typename vector_traits<Normal>::value_type>(a[1] * b[2]);
138 n[1] += static_cast<typename vector_traits<Normal>::value_type>(a[2] * b[0]);
139 n[2] += static_cast<typename vector_traits<Normal>::value_type>(a[0] * b[1]);
140 }
141
142 const typename vector_traits<Normal>::value_type length = norm(n);
143
144 // The expression ((n *= (1.0/norm)),n) is used because the OpenSG
145 // vector class does not return self after component-wise
146 // self-multiplication with a scalar!!!
147 return (length != typename vector_traits<Normal>::value_type(0))
148 ? ((n *= (typename vector_traits<Normal>::value_type(1)/length)), n)
149 : Normal(0, 0, 0);
150 }
151
152 template <class Kernel>
153 typename PolyMeshT<Kernel>::Normal
154 PolyMeshT<Kernel>::calc_face_normal_impl(FaceHandle, PointIsNot3DTag) const
155 {
156 // Dummy fallback implementation
157 // Returns just an initialized all 0 normal
158 // This function is only used if we don't have a matching implementation
159 // for normal computation with the current vector type defined in the mesh traits
160
161 assert(false);
162
163 Normal normal;
164 vectorize(normal,Scalar(0));
165 return normal;
166 }
167
168 //-----------------------------------------------------------------------------
169
170 template <class Kernel>
171 typename PolyMeshT<Kernel>::Normal
172 PolyMeshT<Kernel>::
173 calc_face_normal(const Point& _p0,
174 const Point& _p1,
175 const Point& _p2) const
176 {
177 return calc_face_normal_impl(_p0, _p1, _p2, typename GenProg::IF<
178 vector_traits<PolyMeshT<Kernel>::Point>::size_ == 3,
179 PointIs3DTag,
180 PointIsNot3DTag
181 >::Result());
182 }
183
184 template<class Kernel>
185 typename PolyMeshT<Kernel>::Normal
186 PolyMeshT<Kernel>::
187 calc_normal(FaceHandle _fh) const
188 {
189 return calc_face_normal(_fh);
190 }
191
192 template <class Kernel>
193 typename PolyMeshT<Kernel>::Normal
194 PolyMeshT<Kernel>::
195 calc_face_normal_impl(const Point& _p0,
196 const Point& _p1,
197 const Point& _p2,
198 PointIs3DTag) const
199 {
200 #if 1
201 // The OpenSG <Vector>::operator -= () does not support the type Point
202 // as rhs. Therefore use vector_cast at this point!!!
203 // Note! OpenSG distinguishes between Normal and Point!!!
204 Normal p1p0(vector_cast<Normal>(_p0)); p1p0 -= vector_cast<Normal>(_p1);
205 Normal p1p2(vector_cast<Normal>(_p2)); p1p2 -= vector_cast<Normal>(_p1);
206
207 Normal n = cross(p1p2, p1p0);
208 typename vector_traits<Normal>::value_type length = norm(n);
209
210 // The expression ((n *= (1.0/norm)),n) is used because the OpenSG
211 // vector class does not return self after component-wise
212 // self-multiplication with a scalar!!!
213 return (length != typename vector_traits<Normal>::value_type(0))
214 ? ((n *= (typename vector_traits<Normal>::value_type(1)/length)),n)
215 : Normal(0,0,0);
216 #else
217 Point p1p0 = _p0; p1p0 -= _p1;
218 Point p1p2 = _p2; p1p2 -= _p1;
219
220 Normal n = vector_cast<Normal>(cross(p1p2, p1p0));
221 typename vector_traits<Normal>::value_type length = norm(n);
222
223 return (length != 0.0) ? n *= (1.0/length) : Normal(0,0,0);
224 #endif
225 }
226
227 template <class Kernel>
228 typename PolyMeshT<Kernel>::Normal
229 PolyMeshT<Kernel>::calc_face_normal_impl(const Point&, const Point&, const Point&, PointIsNot3DTag) const
230 {
231
232 // Dummy fallback implementation
233 // Returns just an initialized all 0 normal
234 // This function is only used if we don't have a matching implementation
235 // for normal computation with the current vector type defined in the mesh traits
236
237 assert(false);
238
239 Normal normal;
240 vectorize(normal,Scalar(0));
241 return normal;
242 }
243
244 //-----------------------------------------------------------------------------
245
246 template <class Kernel>
247 typename PolyMeshT<Kernel>::Point
248 PolyMeshT<Kernel>::
249 calc_face_centroid(FaceHandle _fh) const
250 {
251 Point _pt;
252 vectorize(_pt, Scalar(0));
253 Scalar valence = 0.0;
254 for (ConstFaceVertexIter cfv_it = this->cfv_iter(_fh); cfv_it.is_valid(); ++cfv_it, valence += 1.0)
255 {
256 _pt += this->point(*cfv_it);
257 }
258 _pt /= valence;
259 return _pt;
260 }
261
262 //-----------------------------------------------------------------------------
263
264 template<class Kernel>
265 typename PolyMeshT<Kernel>::Point
266 PolyMeshT<Kernel>::
267 calc_centroid(FaceHandle _fh) const
268 {
269 return calc_face_centroid(_fh);
270 }
271
272 //-----------------------------------------------------------------------------
273
274 template<class Kernel>
275 typename PolyMeshT<Kernel>::Point
276 PolyMeshT<Kernel>::
277 calc_centroid(EdgeHandle _eh) const
278 {
279 return this->calc_edge_midpoint(_eh);
280 }
281
282 //-----------------------------------------------------------------------------
283
284 template<class Kernel>
285 typename PolyMeshT<Kernel>::Point
286 PolyMeshT<Kernel>::
287 calc_centroid(HalfedgeHandle _heh) const
288 {
289 return this->calc_edge_midpoint(this->edge_handle(_heh));
290 }
291
292 //-----------------------------------------------------------------------------
293
294 template<class Kernel>
295 typename PolyMeshT<Kernel>::Point
296 PolyMeshT<Kernel>::
297 calc_centroid(VertexHandle _vh) const
298 {
299 return this->point(_vh);
300 }
301
302 //-----------------------------------------------------------------------------
303
304 template<class Kernel>
305 typename PolyMeshT<Kernel>::Point
306 PolyMeshT<Kernel>::
307 calc_centroid(MeshHandle /*_mh*/) const
308 {
309 return this->vertices().avg(getPointsProperty(*this));
310 }
311
312 //-----------------------------------------------------------------------------
313
314 template <class Kernel>
315 void
316 PolyMeshT<Kernel>::
317 update_normals()
318 {
319 // Face normals are required to compute the vertex and the halfedge normals
320 if (Kernel::has_face_normals() ) {
321 update_face_normals();
322
323 if (Kernel::has_vertex_normals() ) update_vertex_normals();
324 if (Kernel::has_halfedge_normals()) update_halfedge_normals();
325 }
326 }
327
328
329 //-----------------------------------------------------------------------------
330
331
332 template <class Kernel>
333 void
334 PolyMeshT<Kernel>::
335 update_face_normals()
336 {
337 FaceIter f_it(Kernel::faces_sbegin()), f_end(Kernel::faces_end());
338
339 for (; f_it != f_end; ++f_it)
340 this->set_normal(*f_it, calc_face_normal(*f_it));
341 }
342
343
344 //-----------------------------------------------------------------------------
345
346
347 template <class Kernel>
348 void
349 PolyMeshT<Kernel>::
350 update_halfedge_normals(const double _feature_angle)
351 {
352 HalfedgeIter h_it(Kernel::halfedges_begin()), h_end(Kernel::halfedges_end());
353
354 for (; h_it != h_end; ++h_it)
355 this->set_normal(*h_it, calc_halfedge_normal(*h_it, _feature_angle));
356 }
357
358
359 //-----------------------------------------------------------------------------
360
361
362 template <class Kernel>
363 typename PolyMeshT<Kernel>::Normal
364 PolyMeshT<Kernel>::
365 calc_halfedge_normal(HalfedgeHandle _heh, const double _feature_angle) const
366 {
367 if(Kernel::is_boundary(_heh))
368 return Normal(0,0,0);
369 else
370 {
371 std::vector<FaceHandle> fhs; fhs.reserve(10);
372
373 HalfedgeHandle heh = _heh;
374
375 // collect CW face-handles
376 do
377 {
378 fhs.push_back(Kernel::face_handle(heh));
379
380 heh = Kernel::next_halfedge_handle(heh);
381 heh = Kernel::opposite_halfedge_handle(heh);
382 }
383 while(heh != _heh && !Kernel::is_boundary(heh) && !is_estimated_feature_edge(heh, _feature_angle));
384
385 // collect CCW face-handles
386 if(heh != _heh && !is_estimated_feature_edge(_heh, _feature_angle))
387 {
388 heh = Kernel::opposite_halfedge_handle(_heh);
389
390 if ( !Kernel::is_boundary(heh) ) {
391 do
392 {
393
394 fhs.push_back(Kernel::face_handle(heh));
395
396 heh = Kernel::prev_halfedge_handle(heh);
397 heh = Kernel::opposite_halfedge_handle(heh);
398 }
399 while(!Kernel::is_boundary(heh) && !is_estimated_feature_edge(heh, _feature_angle));
400 }
401 }
402
403 Normal n(0,0,0);
404 for(unsigned int i=0; i<fhs.size(); ++i)
405 n += Kernel::normal(fhs[i]);
406
407 return normalize(n);
408 }
409 }
410
411
412 //-----------------------------------------------------------------------------
413
414
415 template <class Kernel>
416 typename PolyMeshT<Kernel>::Normal
417 PolyMeshT<Kernel>::
418 calc_normal(HalfedgeHandle _heh, const double _feature_angle) const
419 {
420 return calc_halfedge_normal(_heh, _feature_angle);
421 }
422
423
424 //-----------------------------------------------------------------------------
425
426
427 template <class Kernel>
428 bool
429 PolyMeshT<Kernel>::
430 is_estimated_feature_edge(HalfedgeHandle _heh, const double _feature_angle) const
431 {
432 EdgeHandle eh = Kernel::edge_handle(_heh);
433
434 if(Kernel::has_edge_status())
435 {
436 if(Kernel::status(eh).feature())
437 return true;
438 }
439
440 if(Kernel::is_boundary(eh))
441 return false;
442
443 // compute angle between faces
444 FaceHandle fh0 = Kernel::face_handle(_heh);
445 FaceHandle fh1 = Kernel::face_handle(Kernel::opposite_halfedge_handle(_heh));
446
447 Normal fn0 = Kernel::normal(fh0);
448 Normal fn1 = Kernel::normal(fh1);
449
450 // dihedral angle above angle threshold
451 return ( dot(fn0,fn1) < cos(_feature_angle) );
452 }
453
454
455 //-----------------------------------------------------------------------------
456
457
458 template <class Kernel>
459 typename PolyMeshT<Kernel>::Normal
460 PolyMeshT<Kernel>::
461 calc_vertex_normal(VertexHandle _vh) const
462 {
463 Normal n;
464 calc_vertex_normal_fast(_vh,n);
465
466 Scalar length = norm(n);
467 if (length != 0.0) n *= (Scalar(1.0)/length);
468
469 return n;
470 }
471
472 //-----------------------------------------------------------------------------
473 template <class Kernel>
474 void PolyMeshT<Kernel>::
475 calc_vertex_normal_fast(VertexHandle _vh, Normal& _n) const
476 {
477 vectorize(_n, Scalar(0));
478 for (ConstVertexFaceIter vf_it = this->cvf_iter(_vh); vf_it.is_valid(); ++vf_it)
479 _n += this->normal(*vf_it);
480 }
481
482 //-----------------------------------------------------------------------------
483 template <class Kernel>
484 void PolyMeshT<Kernel>::
485 calc_vertex_normal_correct(VertexHandle _vh, Normal& _n) const
486 {
487 vectorize(_n, Scalar(0));
488 ConstVertexIHalfedgeIter cvih_it = this->cvih_iter(_vh);
489 if (! cvih_it.is_valid() )
490 {//don't crash on isolated vertices
491 return;
492 }
493 Normal in_he_vec;
494 calc_edge_vector(*cvih_it, in_he_vec);
495 for ( ; cvih_it.is_valid(); ++cvih_it)
496 {//calculates the sector normal defined by cvih_it and adds it to _n
497 if (this->is_boundary(*cvih_it))
498 {
499 continue;
500 }
501 HalfedgeHandle out_heh(this->next_halfedge_handle(*cvih_it));
502 Normal out_he_vec;
503 calc_edge_vector(out_heh, out_he_vec);
504 _n += cross(in_he_vec, out_he_vec);//sector area is taken into account
505 in_he_vec = out_he_vec;
506 in_he_vec *= -1;//change the orientation
507 }
508 Scalar length = norm(_n);
509 if (length != 0.0)
510 _n *= (Scalar(1.0)/length);
511 }
512
513 //-----------------------------------------------------------------------------
514 template <class Kernel>
515 void PolyMeshT<Kernel>::
516 calc_vertex_normal_loop(VertexHandle _vh, Normal& _n) const
517 {
518 static const LoopSchemeMaskDouble& loop_scheme_mask__ =
519 LoopSchemeMaskDoubleSingleton::Instance();
520
521 Normal t_v(0.0,0.0,0.0), t_w(0.0,0.0,0.0);
522 unsigned int vh_val = this->valence(_vh);
523 unsigned int i = 0;
524 for (ConstVertexOHalfedgeIter cvoh_it = this->cvoh_iter(_vh); cvoh_it.is_valid(); ++cvoh_it, ++i)
525 {
526 VertexHandle r1_v( this->to_vertex_handle(*cvoh_it) );
527 t_v += (typename vector_traits<Point>::value_type)(loop_scheme_mask__.tang0_weight(vh_val, i))*this->point(r1_v);
528 t_w += (typename vector_traits<Point>::value_type)(loop_scheme_mask__.tang1_weight(vh_val, i))*this->point(r1_v);
529 }
530 _n = cross(t_w, t_v);//hack: should be cross(t_v, t_w), but then the normals are reversed?
531 }
532
533 //-----------------------------------------------------------------------------
534
535 template<class Kernel>
536 typename PolyMeshT<Kernel>::Normal
537 PolyMeshT<Kernel>::
538 calc_normal(VertexHandle _vh) const
539 {
540 Normal n;
541 calc_vertex_normal_correct(_vh, n);
542 return n;
543 }
544
545 //-----------------------------------------------------------------------------
546
547 template <class Kernel>
548 void
549 PolyMeshT<Kernel>::
550 update_vertex_normals()
551 {
552 VertexIter v_it(Kernel::vertices_begin()), v_end(Kernel::vertices_end());
553
554 for (; v_it!=v_end; ++v_it)
555 this->set_normal(*v_it, calc_vertex_normal(*v_it));
556 }
557
558 //=============================================================================
559 } // namespace OpenMesh
560 //=============================================================================
OpenMesh::vector_cast
void vector_cast(const src_t &_src, dst_t &_dst, GenProg::Int2Type< n >)
Cast vector type to another vector type by copying the vector elements.
Definition: vector_cast.hh:81
OpenMesh::PolyMeshT::calc_face_normal
virtual Normal calc_face_normal(FaceHandle _fh) const
Calculate normal vector for face _fh.
Definition: PolyMeshT_impl.hh:97
OpenMesh::PolyMeshT::is_estimated_feature_edge
bool is_estimated_feature_edge(HalfedgeHandle _heh, const double _feature_angle) const
identifies feature edges w.r.t.
Definition: PolyMeshT_impl.hh:430
OpenMesh::PolyMeshT::Scalar
Kernel::Scalar Scalar
Scalar type.
Definition: PolyMeshT.hh:110
OpenMesh::PolyMeshT::update_vertex_normals
void update_vertex_normals()
Update normal vectors for all vertices.
Definition: PolyMeshT_impl.hh:550
OpenMesh::PolyMeshT::update_halfedge_normals
void update_halfedge_normals(const double _feature_angle=0.8)
Update normal vectors for all halfedges.
Definition: PolyMeshT_impl.hh:350
OpenMesh::LoopSchemeMaskT
implements cache for the weights of the original Loop scheme supported:
Definition: LoopSchemeMaskT.hh:66
OpenMesh::PolyMeshT::calc_centroid
Point calc_centroid(FaceHandle _fh) const
Computes and returns the average of the vertices defining _fh (same as calc_face_centroid) ...
Definition: PolyMeshT_impl.hh:267
OpenMesh::PolyMeshT::calc_vertex_normal_loop
void calc_vertex_normal_loop(VertexHandle _vh, Normal &_n) const
Compute normals for all primitives.
Definition: PolyMeshT_impl.hh:516
OpenMesh::PolyMeshT::ConstFaceVertexIter
Kernel::ConstFaceVertexIter ConstFaceVertexIter
Circulator.
Definition: PolyMeshT.hh:177
OpenMesh::PolyMeshT::calc_halfedge_normal
virtual Normal calc_halfedge_normal(HalfedgeHandle _heh, const double _feature_angle=0.8) const
Calculate halfedge normal for one specific halfedge.
Definition: PolyMeshT_impl.hh:365
OpenMesh::vector_traits
Helper class providing information about a vector type.
Definition: vector_traits.hh:88
OpenMesh::dot
osg::Vec3f::ValueType dot(const osg::Vec3f &_v1, const osg::Vec3f &_v2)
Adapter for osg vector member computing a scalar product.
Definition: VectorAdapter.hh:176
OpenMesh::PolyMeshT::ConstVertexOHalfedgeIter
Kernel::ConstVertexOHalfedgeIter ConstVertexOHalfedgeIter
Circulator.
Definition: PolyMeshT.hh:173
OpenMesh::PolyMeshT::calc_normal
Normal calc_normal(FaceHandle _fh) const
same as calc_face_normal
Definition: PolyMeshT_impl.hh:187
OpenMesh::PolyMeshT::calc_vertex_normal_correct
void calc_vertex_normal_correct(VertexHandle _vh, Normal &_n) const
Compute normals for all primitives.
Definition: PolyMeshT_impl.hh:485
OpenMesh::PolyMeshT::update_normals
void update_normals()
Compute normals for all primitives.
Definition: PolyMeshT_impl.hh:317
OpenMesh::PolyMeshT::Normal
Kernel::Normal Normal
Normal type.
Definition: PolyMeshT.hh:114
OpenMesh::PolyMeshT::ConstVertexFaceIter
Kernel::ConstVertexFaceIter ConstVertexFaceIter
Circulator.
Definition: PolyMeshT.hh:176
OpenMesh::PolyMeshT::calc_vertex_normal
Normal calc_vertex_normal(VertexHandle _vh) const
Calculate vertex normal for one specific vertex.
Definition: PolyMeshT_impl.hh:461
OpenMesh::PolyMeshT::calc_face_centroid
void calc_face_centroid(FaceHandle _fh, Point &_pt) const
calculates the average of the vertices defining _fh
Definition: PolyMeshT.hh:279
OpenMesh::vector_traits::value_type
T::value_type value_type
Type of the scalar value.
Definition: vector_traits.hh:94
omstream.hh
This file provides the streams omlog, omout, and omerr.
OpenMesh::PolyMeshT::update_face_normals
void update_face_normals()
Update normal vectors for all faces.
Definition: PolyMeshT_impl.hh:335
OpenMesh::PolyMeshT::find_feature_edges
unsigned int find_feature_edges(Scalar _angle_tresh=OpenMesh::deg_to_rad(44.0))
tags an edge as a feature if its dihedral angle is larger than _angle_tresh returns the number of the...
Definition: PolyMeshT_impl.hh:74
OpenMesh::cross
osg::Vec3f cross(const osg::Vec3f &_v1, const osg::Vec3f &_v2)
Adapter for osg vector member computing a scalar product.
Definition: VectorAdapter.hh:191
OpenMesh::PolyMeshT::calc_vertex_normal_fast
void calc_vertex_normal_fast(VertexHandle _vh, Normal &_n) const
Different methods for calculation of the normal at _vh:
Definition: PolyMeshT_impl.hh:475
OpenMesh::MeshHandle
Handle type for meshes to simplify some template programming.
Definition: Handles.hh:148
OpenMesh::PolyMeshT::Point
Kernel::Point Point
Coordinate type.
Definition: PolyMeshT.hh:112
OpenMesh::PolyMeshT::ConstVertexIHalfedgeIter
Kernel::ConstVertexIHalfedgeIter ConstVertexIHalfedgeIter
Circulator.
Definition: PolyMeshT.hh:174
OpenMesh
Contains all the mesh ingredients like the polygonal mesh, the triangle mesh, different mesh kernels ...
Definition: MeshItems.hh:59
OpenMesh::PolyMeshT::VertexHandle
Kernel::VertexHandle VertexHandle
Handle for referencing the corresponding item.
Definition: PolyMeshT.hh:136
OpenMesh::Attributes::Normal
Add normals to mesh item (vertices/faces)
Definition: Attributes.hh:82
OpenMesh::PolyMeshT
Base type for a polygonal mesh.
Definition: PolyMeshT.hh:90
OpenMesh::SingletonT::Instance
static T & Instance()
Singleton access function.
Definition: SingletonT.hh:86