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ModNormalFlippingT.hh
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53 //=============================================================================
54 //
55 // CLASS ModNormalFlipping
56 //
57 //=============================================================================
58
59
60 #ifndef OPENMESH_DECIMATER_MODNORMALFLIPPING_HH
61 #define OPENMESH_DECIMATER_MODNORMALFLIPPING_HH
62
63
64 //== INCLUDES =================================================================
65
66 #include <OpenMesh/Tools/Decimater/ModBaseT.hh>
67
68 //== NAMESPACES ===============================================================
69
70 namespace OpenMesh { // BEGIN_NS_OPENMESH
71 namespace Decimater { // BEGIN_NS_DECIMATER
72
73
74 //== CLASS DEFINITION =========================================================
75
84 template <typename MeshT>
85 class ModNormalFlippingT : public ModBaseT< MeshT >
86 {
87 public:
88
89 DECIMATING_MODULE( ModNormalFlippingT, MeshT, NormalFlipping );
90
91 public:
92
94 ModNormalFlippingT( MeshT &_mesh) : Base(_mesh, true)
95 {
96 set_max_normal_deviation( 90.0f );
97 const bool mesh_has_normals = _mesh.has_face_normals();
98 _mesh.request_face_normals();
99
100 if (!mesh_has_normals)
101 {
102 omerr() << "Mesh has no face normals. Compute them automatically." << std::endl;
103 _mesh.update_face_normals();
104 }
105 }
106
107
108 ~ModNormalFlippingT()
109 {
110 Base::mesh().release_face_normals();
111 }
112
113
114 public:
115
130 float collapse_priority(const CollapseInfo& _ci)
131 {
132 // simulate collapse
133 Base::mesh().set_point(_ci.v0, _ci.p1);
134
135 // check for flipping normals
136 typename Mesh::ConstVertexFaceIter vf_it(Base::mesh(), _ci.v0);
137 typename Mesh::FaceHandle fh;
138 typename Mesh::Scalar c(1.0);
139
140 for (; vf_it.is_valid(); ++vf_it)
141 {
142 fh = *vf_it;
143 if (fh != _ci.fl && fh != _ci.fr)
144 {
145 typename Mesh::Normal n1 = Base::mesh().normal(fh);
146 typename Mesh::Normal n2 = Base::mesh().calc_face_normal(fh);
147
148 c = dot(n1, n2);
149
150 if (c < min_cos_)
151 break;
152 }
153 }
154
155 // undo simulation changes
156 Base::mesh().set_point(_ci.v0, _ci.p0);
157
158 return float( (c < min_cos_) ? Base::ILLEGAL_COLLAPSE : Base::LEGAL_COLLAPSE );
159 }
160
162 void set_error_tolerance_factor(double _factor) {
163 if (_factor >= 0.0 && _factor <= 1.0) {
164 // the smaller the factor, the smaller max_deviation_ gets
165 // thus creating a stricter constraint
166 // division by error_tolerance_factor_ is for normalization
167 double max_normal_deviation = (max_deviation_ * 180.0/M_PI) * _factor / this->error_tolerance_factor_;
168 set_max_normal_deviation(max_normal_deviation);
169 this->error_tolerance_factor_ = _factor;
170 }
171 }
172
173
174 public:
175
177 double max_normal_deviation() const { return max_deviation_ / M_PI * 180.0; }
178
184 void set_max_normal_deviation(double _d) {
185 max_deviation_ = _d / 180.0 * M_PI;
186 min_cos_ = cos(max_deviation_);
187 }
188
189 private:
190
191 // hide this method
192 void set_binary(bool _b) {}
193
194 private:
195
196 // maximum normal deviation
197 double max_deviation_, min_cos_;
198 };
199
200
201 //=============================================================================
202 } // END_NS_DECIMATER
203 } // END_NS_OPENMESH
204 //=============================================================================
205 #endif // OPENACG_MODNORMALFLIPPING_HH defined
206 //=============================================================================
207
OpenMesh::Attributes::Normal
Add normals to mesh item (vertices/faces)
Definition: Attributes.hh:87
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
ModBaseT.hh
Base class for all decimation modules.
OpenMesh::Decimater::ModNormalFlippingT::max_normal_deviation
double max_normal_deviation() const
get normal deviation
Definition: ModNormalFlippingT.hh:177
OpenMesh::Decimater::CollapseInfoT::p0
Mesh::Point p0
Position of removed vertex.
Definition: CollapseInfoT.hh:99
OpenMesh::Decimater::CollapseInfoT::fl
Mesh::FaceHandle fl
Left face.
Definition: CollapseInfoT.hh:101
OpenMesh::Decimater::ModNormalFlippingT::ModNormalFlippingT
ModNormalFlippingT(MeshT &_mesh)
Constructor.
Definition: ModNormalFlippingT.hh:94
OpenMesh::Decimater::ModNormalFlippingT
Decimating module to avoid flipping of faces.
Definition: ModNormalFlippingT.hh:85
OpenMesh::Decimater::CollapseInfoT::v0
Mesh::VertexHandle v0
Vertex to be removed.
Definition: CollapseInfoT.hh:97
OpenMesh::Decimater::CollapseInfoT::p1
Mesh::Point p1
Positions of remaining vertex.
Definition: CollapseInfoT.hh:100
OpenMesh
Contains all the mesh ingredients like the polygonal mesh, the triangle mesh, different mesh kernels ...
Definition: MeshItems.hh:64
OpenMesh::Decimater::ModNormalFlippingT::collapse_priority
float collapse_priority(const CollapseInfo &_ci)
Compute collapse priority due to angular deviation of face normals before and after a collapse...
Definition: ModNormalFlippingT.hh:130
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::Decimater::ModNormalFlippingT::set_error_tolerance_factor
void set_error_tolerance_factor(double _factor)
set the percentage of maximum normal deviation
Definition: ModNormalFlippingT.hh:162
OpenMesh::Decimater::ModNormalFlippingT::set_max_normal_deviation
void set_max_normal_deviation(double _d)
Set normal deviation.
Definition: ModNormalFlippingT.hh:184
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:181
OpenMesh::Decimater::ModBaseT
Base class for all decimation modules.
Definition: ModBaseT.hh:197