OpenMesh: OpenMesh/Tools/Decimater/ModNormalFlippingT.hh Source File

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ModNormalFlippingT.hh
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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
61 #include <OpenMesh/Tools/Decimater/ModBaseT.hh>
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
103 ~ModNormalFlippingT()
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 // OPENMESH_DECIMATER_MODNORMALFLIPPING_HH defined
201 //=============================================================================
202
ModBaseT.hh
Base class for all decimation modules.
DECIMATING_MODULE
#define DECIMATING_MODULE(Classname, MeshT, Name)
Convenience macro, to be used in derived modules The macro defines the types.
Definition: ModBaseT.hh:149
OpenMesh
Contains all the mesh ingredients like the polygonal mesh, the triangle mesh, different mesh kernels ...
Definition: MeshItems.hh:59
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::Scalar
Kernel::Scalar Scalar
Scalar type.
Definition: PolyMeshT.hh:110
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::FaceHandle
Kernel::FaceHandle FaceHandle
Scalar type.
Definition: PolyMeshT.hh:139
OpenMesh::Decimater::CollapseInfoT
Stores information about a halfedge collapse.
Definition: CollapseInfoT.hh:74
OpenMesh::Decimater::CollapseInfoT::fr
Mesh::FaceHandle fr
Right face.
Definition: CollapseInfoT.hh:87
OpenMesh::Decimater::CollapseInfoT::p0
Mesh::Point p0
Position of removed vertex.
Definition: CollapseInfoT.hh:84
OpenMesh::Decimater::CollapseInfoT::p1
Mesh::Point p1
Positions of remaining vertex.
Definition: CollapseInfoT.hh:85
OpenMesh::Decimater::CollapseInfoT::v0
Mesh::VertexHandle v0
Vertex to be removed.
Definition: CollapseInfoT.hh:82
OpenMesh::Decimater::CollapseInfoT::fl
Mesh::FaceHandle fl
Left face.
Definition: CollapseInfoT.hh:86
OpenMesh::Decimater::ModBaseT
Base class for all decimation modules.
Definition: ModBaseT.hh:193
OpenMesh::Decimater::ModNormalFlippingT
Decimating module to avoid flipping of faces.
Definition: ModNormalFlippingT.hh:81
OpenMesh::Decimater::ModNormalFlippingT::max_normal_deviation
double max_normal_deviation() const
get normal deviation
Definition: ModNormalFlippingT.hh:172
OpenMesh::Decimater::ModNormalFlippingT::ModNormalFlippingT
ModNormalFlippingT(MeshT &_mesh)
Constructor.
Definition: ModNormalFlippingT.hh:89
OpenMesh::Decimater::ModNormalFlippingT::set_error_tolerance_factor
void set_error_tolerance_factor(double _factor) override
set the percentage of maximum normal deviation
Definition: ModNormalFlippingT.hh:157
OpenMesh::Decimater::ModNormalFlippingT::collapse_priority
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
OpenMesh::Decimater::ModNormalFlippingT::set_max_normal_deviation
void set_max_normal_deviation(double _d)
Set normal deviation.
Definition: ModNormalFlippingT.hh:179