Developer Documentation

JacobiLaplaceSmootherT_impl.hh
Go to the documentation of this file.
1 /* ========================================================================= *
2 * *
3 * OpenMesh *
4 * Copyright (c) 2001-2015, RWTH-Aachen University *
5 * Department of Computer Graphics and Multimedia *
6 * All rights reserved. *
7 * www.openmesh.org *
8 * *
9 *---------------------------------------------------------------------------*
10 * This file is part of OpenMesh. *
11 *---------------------------------------------------------------------------*
12 * *
13 * Redistribution and use in source and binary forms, with or without *
14 * modification, are permitted provided that the following conditions *
15 * are met: *
16 * *
17 * 1. Redistributions of source code must retain the above copyright notice, *
18 * this list of conditions and the following disclaimer. *
19 * *
20 * 2. Redistributions in binary form must reproduce the above copyright *
21 * notice, this list of conditions and the following disclaimer in the *
22 * documentation and/or other materials provided with the distribution. *
23 * *
24 * 3. Neither the name of the copyright holder nor the names of its *
25 * contributors may be used to endorse or promote products derived from *
26 * this software without specific prior written permission. *
27 * *
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS *
29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED *
30 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A *
31 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER *
32 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, *
33 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, *
34 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR *
35 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF *
36 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING *
37 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS *
38 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
39 * *
40 * ========================================================================= */
41
42
43
48 //=============================================================================
49 //
50 // CLASS JacobiLaplaceSmootherT - IMPLEMENTATION
51 //
52 //=============================================================================
53
54 #define OPENMESH_JACOBI_LAPLACE_SMOOTHERT_C
55
56 //== INCLUDES =================================================================
57
58 #include <OpenMesh/Tools/Smoother/JacobiLaplaceSmootherT.hh>
59
60
61 //== NAMESPACES ===============================================================
62
63
64 namespace OpenMesh {
65 namespace Smoother {
66
67
68 //== IMPLEMENTATION ==========================================================
69
70
71 template <class Mesh>
72 void
73 JacobiLaplaceSmootherT<Mesh>::
74 smooth(unsigned int _n)
75 {
76 if (Base::continuity() > Base::C0)
77 {
78 Base::mesh_.add_property(umbrellas_);
79 if (Base::continuity() > Base::C1)
80 Base::mesh_.add_property(squared_umbrellas_);
81 }
82
83 LaplaceSmootherT<Mesh>::smooth(_n);
84
85 if (Base::continuity() > Base::C0)
86 {
87 Base::mesh_.remove_property(umbrellas_);
88 if (Base::continuity() > Base::C1)
89 Base::mesh_.remove_property(squared_umbrellas_);
90 }
91 }
92
93
94 //-----------------------------------------------------------------------------
95
96
97 template <class Mesh>
98 void
99 JacobiLaplaceSmootherT<Mesh>::
100 compute_new_positions_C0()
101 {
102 typename Mesh::VertexIter v_it, v_end(Base::mesh_.vertices_end());
103 typename Mesh::ConstVertexOHalfedgeIter voh_it;
104 typename Mesh::Normal u, p, zero(0,0,0);
105 typename Mesh::Scalar w;
106
107 for (v_it=Base::mesh_.vertices_begin(); v_it!=v_end; ++v_it)
108 {
109 if (this->is_active(*v_it))
110 {
111 // compute umbrella
112 u = zero;
113 for (voh_it = Base::mesh_.cvoh_iter(*v_it); voh_it.is_valid(); ++voh_it) {
114 w = this->weight(Base::mesh_.edge_handle(*voh_it));
115 u += vector_cast<typename Mesh::Normal>(Base::mesh_.point(Base::mesh_.to_vertex_handle(*voh_it))) * w;
116 }
117 u *= this->weight(*v_it);
118 u -= vector_cast<typename Mesh::Normal>(Base::mesh_.point(*v_it));
119
120 // damping
121 u *= static_cast< typename Mesh::Scalar >(0.5);
122
123 // store new position
124 p = vector_cast<typename Mesh::Normal>(Base::mesh_.point(*v_it));
125 p += u;
126 this->set_new_position(*v_it, p);
127 }
128 }
129 }
130
131
132 //-----------------------------------------------------------------------------
133
134
135 template <class Mesh>
136 void
137 JacobiLaplaceSmootherT<Mesh>::
138 compute_new_positions_C1()
139 {
140 typename Mesh::VertexIter v_it, v_end(Base::mesh_.vertices_end());
141 typename Mesh::ConstVertexOHalfedgeIter voh_it;
142 typename Mesh::Normal u, uu, p, zero(0,0,0);
143 typename Mesh::Scalar w, diag;
144
145
146 // 1st pass: compute umbrellas
147 for (v_it=Base::mesh_.vertices_begin(); v_it!=v_end; ++v_it)
148 {
149 u = zero;
150 for (voh_it = Base::mesh_.cvoh_iter(*v_it); voh_it.is_valid(); ++voh_it) {
151 w = this->weight(Base::mesh_.edge_handle(*voh_it));
152 u -= vector_cast<typename Mesh::Normal>(Base::mesh_.point(Base::mesh_.to_vertex_handle(*voh_it)))*w;
153 }
154 u *= this->weight(*v_it);
155 u += vector_cast<typename Mesh::Normal>(Base::mesh_.point(*v_it));
156
157 Base::mesh_.property(umbrellas_, *v_it) = u;
158 }
159
160
161 // 2nd pass: compute updates
162 for (v_it=Base::mesh_.vertices_begin(); v_it!=v_end; ++v_it)
163 {
164 if (this->is_active(*v_it))
165 {
166 uu = zero;
167 diag = 0.0;
168 for (voh_it = Base::mesh_.cvoh_iter(*v_it); voh_it.is_valid(); ++voh_it) {
169 w = this->weight(Base::mesh_.edge_handle(*voh_it));
170 uu -= Base::mesh_.property(umbrellas_, Base::mesh_.to_vertex_handle(*voh_it));
171 diag += (w * this->weight(Base::mesh_.to_vertex_handle(*voh_it)) + static_cast<typename Mesh::Scalar>(1.0) ) * w;
172 }
173 uu *= this->weight(*v_it);
174 diag *= this->weight(*v_it);
175 uu += Base::mesh_.property(umbrellas_, *v_it);
176 if (diag) uu *= static_cast<typename Mesh::Scalar>(1.0) / diag;
177
178 // damping
179 uu *= static_cast<typename vector_traits<typename Mesh::Normal>::value_type>(0.25);
180
181 // store new position
182 p = vector_cast<typename Mesh::Normal>(Base::mesh_.point(*v_it));
183 p -= uu;
184 this->set_new_position(*v_it, p);
185 }
186 }
187 }
188
189
190 //=============================================================================
191 } // namespace Smoother
192 } // namespace OpenMesh
193 //=============================================================================
OpenMesh::Smoother::SmootherT::smooth
virtual void smooth(unsigned int _n)
Do _n smoothing iterations.
Definition: SmootherT_impl.hh:302
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::Normal
Kernel::Normal Normal
Normal type.
Definition: PolyMeshT.hh:114
OpenMesh::Smoother::JacobiLaplaceSmootherT::smooth
void smooth(unsigned int _n)
Do _n smoothing iterations.
Definition: JacobiLaplaceSmootherT_impl.hh:74
OpenMesh::Smoother::JacobiLaplaceSmootherT
Definition: JacobiLaplaceSmootherT.hh:75
OpenMesh
Definition: MeshItems.hh:59
OpenMesh::PolyMeshT::Scalar
Kernel::Scalar Scalar
Scalar type.
Definition: PolyMeshT.hh:110
JacobiLaplaceSmootherT.hh
OpenMesh::PolyMeshT::ConstVertexOHalfedgeIter
Kernel::ConstVertexOHalfedgeIter ConstVertexOHalfedgeIter
Circulator.
Definition: PolyMeshT.hh:173
OpenMesh::vector_traits::value_type
T::value_type value_type
Type of the scalar value.
Definition: vector_traits.hh:94