OpenMesh
ModNormalFlippingT.hh
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42 
43 
48 //=============================================================================
49 //
50 // CLASS ModNormalFlipping
51 //
52 //=============================================================================
53 
54 
55 #ifndef OPENMESH_DECIMATER_MODNORMALFLIPPING_HH
56 #define OPENMESH_DECIMATER_MODNORMALFLIPPING_HH
57 
58 
59 //== INCLUDES =================================================================
60 
62 
63 //== NAMESPACES ===============================================================
64 
65 namespace OpenMesh { // BEGIN_NS_OPENMESH
66 namespace Decimater { // BEGIN_NS_DECIMATER
67 
68 
69 //== CLASS DEFINITION =========================================================
70 
79 template <typename MeshT>
80 class ModNormalFlippingT : public ModBaseT< MeshT >
81 {
82 public:
83 
84  DECIMATING_MODULE( ModNormalFlippingT, MeshT, NormalFlipping );
85 
86 public:
87 
89  explicit ModNormalFlippingT( MeshT &_mesh) : Base(_mesh, true)
90  {
91  set_max_normal_deviation( 90.0f );
92  const bool mesh_has_normals = _mesh.has_face_normals();
93  _mesh.request_face_normals();
94 
95  if (!mesh_has_normals)
96  {
97  omerr() << "Mesh has no face normals. Compute them automatically." << std::endl;
98  _mesh.update_face_normals();
99  }
100  }
101 
102 
104  {
105  Base::mesh().release_face_normals();
106  }
107 
108 
109 public:
110 
125  float collapse_priority(const CollapseInfo& _ci) override
126  {
127  // simulate collapse
128  Base::mesh().set_point(_ci.v0, _ci.p1);
129 
130  // check for flipping normals
131  typename Mesh::ConstVertexFaceIter vf_it(Base::mesh(), _ci.v0);
132  typename Mesh::FaceHandle fh;
133  typename Mesh::Scalar c(1.0);
134 
135  for (; vf_it.is_valid(); ++vf_it)
136  {
137  fh = *vf_it;
138  if (fh != _ci.fl && fh != _ci.fr)
139  {
140  typename Mesh::Normal n1 = Base::mesh().normal(fh);
141  typename Mesh::Normal n2 = Base::mesh().calc_face_normal(fh);
142 
143  c = dot(n1, n2);
144 
145  if (c < min_cos_)
146  break;
147  }
148  }
149 
150  // undo simulation changes
151  Base::mesh().set_point(_ci.v0, _ci.p0);
152 
153  return float( (c < min_cos_) ? Base::ILLEGAL_COLLAPSE : Base::LEGAL_COLLAPSE );
154  }
155 
157  void set_error_tolerance_factor(double _factor) override {
158  if (_factor >= 0.0 && _factor <= 1.0) {
159  // the smaller the factor, the smaller max_deviation_ gets
160  // thus creating a stricter constraint
161  // division by error_tolerance_factor_ is for normalization
162  double max_normal_deviation_value = (max_deviation_ * 180.0/M_PI) * _factor / this->error_tolerance_factor_;
163  set_max_normal_deviation(max_normal_deviation_value);
164  this->error_tolerance_factor_ = _factor;
165  }
166  }
167 
168 
169 public:
170 
172  double max_normal_deviation() const { return max_deviation_ / M_PI * 180.0; }
173 
179  void set_max_normal_deviation(double _d) {
180  max_deviation_ = _d / 180.0 * M_PI;
181  min_cos_ = cos(max_deviation_);
182  }
183 
184 private:
185 
186  // hide this method
187  void set_binary(bool _b) {}
188 
189 private:
190 
191  // maximum normal deviation
192  double max_deviation_, min_cos_;
193 };
194 
195 
196 //=============================================================================
197 } // END_NS_DECIMATER
198 } // END_NS_OPENMESH
199 //=============================================================================
200 #endif // OPENACG_MODNORMALFLIPPING_HH defined
201 //=============================================================================
202 
Mesh::FaceHandle fl
Left face.
Definition: CollapseInfoT.hh:95
Kernel::Scalar Scalar
Scalar type.
Definition: PolyMeshT.hh:110
float collapse_priority(const CollapseInfo &_ci) override
Compute collapse priority due to angular deviation of face normals before and after a collapse...
Definition: ModNormalFlippingT.hh:125
Mesh::Point p0
Position of removed vertex.
Definition: CollapseInfoT.hh:93
Base class for all decimation modules.
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
ModNormalFlippingT(MeshT &_mesh)
Constructor.
Definition: ModNormalFlippingT.hh:89
double max_normal_deviation() const
get normal deviation
Definition: ModNormalFlippingT.hh:172
Kernel::Normal Normal
Normal type.
Definition: PolyMeshT.hh:114
Kernel::ConstVertexFaceIter ConstVertexFaceIter
Circulator.
Definition: PolyMeshT.hh:176
#define DECIMATING_MODULE(Classname, MeshT, Name)
Convenience macro, to be used in derived modules The macro defines the types.
Definition: ModBaseT.hh:149
Base class for all decimation modules.
Definition: ModBaseT.hh:192
Mesh::FaceHandle fr
Right face.
Definition: CollapseInfoT.hh:96
void set_error_tolerance_factor(double _factor) override
set the percentage of maximum normal deviation
Definition: ModNormalFlippingT.hh:157
Decimating module to avoid flipping of faces.
Definition: ModNormalFlippingT.hh:80
Mesh::Point p1
Positions of remaining vertex.
Definition: CollapseInfoT.hh:94
void set_max_normal_deviation(double _d)
Set normal deviation.
Definition: ModNormalFlippingT.hh:179
Contains all the mesh ingredients like the polygonal mesh, the triangle mesh, different mesh kernels ...
Definition: MeshItems.hh:59
Stores information about a halfedge collapse.
Definition: CollapseInfoT.hh:74
Mesh::VertexHandle v0
Vertex to be removed.
Definition: CollapseInfoT.hh:91

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