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ModRoundnessT.hh
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42 /*===========================================================================*\
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44 * $Revision: 1258 $ *
45 * $Date: 2015-04-28 15:07:46 +0200 (Di, 28 Apr 2015) $ *
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47 \*===========================================================================*/
48
53 //=============================================================================
54 //
55 // CLASS ModRoundnessT
56 //
57 //=============================================================================
58
59 #ifndef OPENMESH_DECIMATER_MODROUNDNESST_HH
60 #define OPENMESH_DECIMATER_MODROUNDNESST_HH
61
62
63 //== INCLUDES =================================================================
64
65 #include <OpenMesh/Tools/Decimater/ModBaseT.hh>
66 #include <math.h>
67
68 #if defined(OM_CC_MSVC)
69 # define OM_ENABLE_WARNINGS 4244
70 # pragma warning(disable : OM_ENABLE_WARNINGS )
71 #endif
72
73 //== NAMESPACE ================================================================
74
75 namespace OpenMesh { // BEGIN_NS_OPENMESH
76 namespace Decimater { // BEGIN_NS_DECIMATER
77
78
79 //== CLASS DEFINITION =========================================================
80
81
90 template <class MeshT>
91 class ModRoundnessT : public ModBaseT<MeshT>
92 {
93 public:
94 DECIMATING_MODULE( ModRoundnessT, MeshT, Roundness );
95
96 public:
97
98 // typedefs
99 typedef typename MeshT::Point Point;
100 typedef typename vector_traits<Point>::value_type value_type;
101
102 public:
103
105 ModRoundnessT( MeshT &_dec ) :
106 Base(_dec, false),
107 min_r_(-1.0)
108 { }
109
111 ~ModRoundnessT() { }
112
113 public: // inherited
114
125 float collapse_priority(const CollapseInfo& _ci)
126 {
127 // using namespace OpenMesh;
128
129 typename Mesh::ConstVertexOHalfedgeIter voh_it(Base::mesh(), _ci.v0);
130 double r;
131 double priority = 0.0; //==LEGAL_COLLAPSE
132 typename Mesh::FaceHandle fhC, fhB;
133 Vec3f B,C;
134
135 if ( min_r_ < 0.0f ) // continues mode
136 {
137 C = vector_cast<Vec3f>(Base::mesh().point( Base::mesh().to_vertex_handle(*voh_it)));
138 fhC = Base::mesh().face_handle( *voh_it );
139
140 for (++voh_it; voh_it.is_valid(); ++voh_it)
141 {
142 B = C;
143 fhB = fhC;
144 C = vector_cast<Vec3f>(Base::mesh().point(Base::mesh().to_vertex_handle(*voh_it)));
145 fhC = Base::mesh().face_handle( *voh_it );
146
147 if ( fhB == _ci.fl || fhB == _ci.fr )
148 continue;
149
150 // simulate collapse using position of v1
151 r = roundness( vector_cast<Vec3f>(_ci.p1), B, C );
152
153 // return the maximum non-roundness
154 priority = std::max( priority, (1.0-r) );
155
156 }
157 }
158 else // binary mode
159 {
160 C = vector_cast<Vec3f>(Base::mesh().point( Base::mesh().to_vertex_handle(*voh_it)));
161 fhC = Base::mesh().face_handle( *voh_it );
162
163 for (++voh_it; voh_it.is_valid() && (priority==Base::LEGAL_COLLAPSE); ++voh_it)
164 {
165 B = C;
166 fhB = fhC;
167 C = vector_cast<Vec3f>(Base::mesh().point(Base::mesh().to_vertex_handle(*voh_it)));
168 fhC = Base::mesh().face_handle( *voh_it );
169
170 if ( fhB == _ci.fl || fhB == _ci.fr )
171 continue;
172
173 priority = ( (r=roundness( vector_cast<Vec3f>(_ci.p1), B, C )) < min_r_)
174 ? Base::ILLEGAL_COLLAPSE : Base::LEGAL_COLLAPSE;
175 }
176 }
177
178 return (float) priority;
179 }
180
182 void set_error_tolerance_factor(double _factor) {
183 if (this->is_binary()) {
184 if (_factor >= 0.0 && _factor <= 1.0) {
185 // the smaller the factor, the smaller min_r_ gets
186 // thus creating a stricter constraint
187 // division by error_tolerance_factor_ is for normalization
188 value_type min_roundness = min_r_ * _factor / this->error_tolerance_factor_;
189 set_min_roundness(min_roundness);
190 this->error_tolerance_factor_ = _factor;
191 }
192 }
193 }
194
195
196 public: // specific methods
197
198 void set_min_angle( float _angle, bool /* _binary=true */ )
199 {
200 assert( _angle > 0 && _angle < 60 );
201
202 _angle = float(M_PI * _angle /180.0);
203
204 Vec3f A,B,C;
205
206 A = Vec3f( 0.0f, 0.0f, 0.0f);
207 B = Vec3f( 2.0f * cos(_angle), 0.0f, 0.0f);
208 C = Vec3f( cos(_angle), sin(_angle), 0.0f);
209
210 double r1 = roundness(A,B,C);
211
212 _angle = float(0.5 * ( M_PI - _angle ));
213
214 A = Vec3f( 0.0f, 0.0f, 0.0f);
215 B = Vec3f( 2.0f*cos(_angle), 0.0f, 0.0f);
216 C = Vec3f( cos(_angle), sin(_angle), 0.0f);
217
218 double r2 = roundness(A,B,C);
219
220 set_min_roundness( value_type(std::min(r1,r2)), true );
221 }
222
230 void set_min_roundness( value_type _min_roundness, bool _binary=true )
231 {
232 assert( 0.0 <= _min_roundness && _min_roundness <= 1.0 );
233 min_r_ = _min_roundness;
234 Base::set_binary(_binary);
235 }
236
238 void unset_min_roundness()
239 {
240 min_r_ = -1.0;
241 Base::set_binary(false);
242 }
243
244 // Compute a normalized roundness of a triangle ABC
245 //
246 // Having
247 // A,B,C corner points of triangle
248 // a,b,c the vectors BC,CA,AB
249 // Area area of triangle
250 //
251 // then define
252 //
253 // radius of circumference
254 // R := -----------------------
255 // length of shortest edge
256 //
257 // ||a|| * ||b|| * ||c||
258 // ---------------------
259 // 4 * Area ||a|| * ||b|| * ||c||
260 // = ----------------------- = -----------------------------------
261 // min( ||a||,||b||,||c||) 4 * Area * min( ||a||,||b||,||c|| )
262 //
263 // ||a|| * ||b|| * ||c||
264 // = -------------------------------------------------------
265 // 4 * 1/2 * ||cross(B-A,C-A)|| * min( ||a||,||b||,||c|| )
266 //
267 // a'a * b'b * c'c
268 // R� = ----------------------------------------------------------
269 // 4 * cross(B-A,C-A)'cross(B-A,C-A) * min( a'a, b'b, c'c )
270 //
271 // a'a * b'b * c'c
272 // R = 1/2 * sqrt(---------------------------)
273 // AA * min( a'a, b'b, c'c )
274 //
275 // At angle 60� R has it's minimum for all edge lengths = sqrt(1/3)
276 //
277 // Define normalized roundness
278 //
279 // nR := sqrt(1/3) / R
280 //
281 // AA * min( a'a, b'b, c'c )
282 // = sqrt(4/3) * sqrt(---------------------------)
283 // a'a * b'b * c'c
284 //
285 double roundness( const Vec3f& A, const Vec3f& B, const Vec3f &C )
286 {
287 const value_type epsilon = value_type(1e-15);
288
289 static const value_type sqrt43 = value_type(sqrt(4.0/3.0)); // 60�,a=b=c, **)
290
291 Vec3f vecAC = C-A;
292 Vec3f vecAB = B-A;
293
294 // compute squared values to avoid sqrt-computations
295 value_type aa = (B-C).sqrnorm();
296 value_type bb = vecAC.sqrnorm();
297 value_type cc = vecAB.sqrnorm();
298 value_type AA = cross(vecAC,vecAB).sqrnorm(); // without factor 1/4 **)
299
300 if ( AA < epsilon )
301 return 0.0;
302
303 double nom = AA * std::min( std::min(aa,bb),cc );
304 double denom = aa * bb * cc;
305 double nR = sqrt43 * sqrt(nom/denom);
306
307 return nR;
308 }
309
310 private:
311
312 value_type min_r_;
313 };
314
315
316 //=============================================================================
317 } // END_NS_DECIMATER
318 } // END_NS_OPENMESH
319 //=============================================================================
320 #if defined(OM_CC_MSVC) && defined(OM_ENABLE_WARNINGS)
321 # pragma warning(default : OM_ENABLE_WARNINGS)
322 # undef OM_ENABLE_WARNINGS
323 #endif
324 //=============================================================================
325 #endif // OPENMESH_DECIMATER_MODROUNDNESST_HH defined
326 //=============================================================================
327
OpenMesh::Decimater::ModRoundnessT
Use Roundness of triangles to control decimation.
Definition: ModRoundnessT.hh:91
OpenMesh::Decimater::ModRoundnessT::set_min_roundness
void set_min_roundness(value_type _min_roundness, bool _binary=true)
Set a minimum roundness value.
Definition: ModRoundnessT.hh:230
OpenMesh
Contains all the mesh ingredients like the polygonal mesh, the triangle mesh, different mesh kernels ...
Definition: MeshItems.hh:64
OpenMesh::Decimater::ModRoundnessT::ModRoundnessT
ModRoundnessT(MeshT &_dec)
Constructor.
Definition: ModRoundnessT.hh:105
OpenMesh::Decimater::ModRoundnessT::~ModRoundnessT
~ModRoundnessT()
Destructor.
Definition: ModRoundnessT.hh:111
OpenMesh::Decimater::ModRoundnessT::set_error_tolerance_factor
void set_error_tolerance_factor(double _factor)
set the percentage of minimum roundness
Definition: ModRoundnessT.hh:182
OpenMesh::Decimater::CollapseInfoT::p1
Mesh::Point p1
Positions of remaining vertex.
Definition: CollapseInfoT.hh:100
OpenMesh::Decimater::ModRoundnessT::unset_min_roundness
void unset_min_roundness()
Unset minimum value constraint and enable non-binary mode.
Definition: ModRoundnessT.hh:238
OpenMesh::Decimater::CollapseInfoT::fl
Mesh::FaceHandle fl
Left face.
Definition: CollapseInfoT.hh:101
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:196
OpenMesh::vector_traits
Helper class providing information about a vector type.
Definition: vector_traits.hh:93
OpenMesh::Decimater::ModBaseT::is_binary
bool is_binary(void) const
Returns true if criteria returns a binary value.
Definition: ModBaseT.hh:225
DECIMATING_MODULE
#define DECIMATING_MODULE(Classname, MeshT, Name)
Convenience macro, to be used in derived modules The macro defines the types.
Definition: ModBaseT.hh:154
OpenMesh::PolyMeshT::ConstVertexOHalfedgeIter
Kernel::ConstVertexOHalfedgeIter ConstVertexOHalfedgeIter
Circulator.
Definition: PolyMeshT.hh:176
OpenMesh::Decimater::ModBaseT
Base class for all decimation modules.
Definition: ModBaseT.hh:197
OpenMesh::Decimater::ModRoundnessT::collapse_priority
float collapse_priority(const CollapseInfo &_ci)
Compute collapse priority due to roundness of triangle.
Definition: ModRoundnessT.hh:125
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:86
OpenMesh::Decimater::CollapseInfoT::v0
Mesh::VertexHandle v0
Vertex to be removed.
Definition: CollapseInfoT.hh:97
ModBaseT.hh
Base class for all decimation modules.
OpenMesh::Decimater::CollapseInfoT::fr
Mesh::FaceHandle fr
Right face.
Definition: CollapseInfoT.hh:102
OpenMesh::Decimater::CollapseInfoT
Stores information about a halfedge collapse.
Definition: CollapseInfoT.hh:80