Developer Documentation

delete_geometry.cc
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 #include <iostream>
44 // -------------------- OpenMesh
45 #include <OpenMesh/Core/IO/MeshIO.hh>
46 #include <OpenMesh/Core/Mesh/PolyMesh_ArrayKernelT.hh>
47 #include <OpenMesh/Core/System/config.h>
48 #include <OpenMesh/Core/Mesh/Status.hh>
49
50 // ----------------------------------------------------------------------------
51
52 struct MyTraits : public OpenMesh::DefaultTraits
53 {
54 VertexAttributes(OpenMesh::Attributes::Status);
55 FaceAttributes(OpenMesh::Attributes::Status);
56 EdgeAttributes(OpenMesh::Attributes::Status);
57 };
58
59
60 typedef OpenMesh::PolyMesh_ArrayKernelT<MyTraits> MyMesh;
61
62
63 // ----------------------------------------------------------------------------
64 // Build a simple cube and delete it except one face
65
66 int main()
67 {
68 MyMesh mesh;
69
70 // generate vertices
71
72 MyMesh::VertexHandle vhandle[8];
73 MyMesh::FaceHandle fhandle[6];
74
75 vhandle[0] = mesh.add_vertex(MyMesh::Point(-1, -1, 1));
76 vhandle[1] = mesh.add_vertex(MyMesh::Point( 1, -1, 1));
77 vhandle[2] = mesh.add_vertex(MyMesh::Point( 1, 1, 1));
78 vhandle[3] = mesh.add_vertex(MyMesh::Point(-1, 1, 1));
79 vhandle[4] = mesh.add_vertex(MyMesh::Point(-1, -1, -1));
80 vhandle[5] = mesh.add_vertex(MyMesh::Point( 1, -1, -1));
81 vhandle[6] = mesh.add_vertex(MyMesh::Point( 1, 1, -1));
82 vhandle[7] = mesh.add_vertex(MyMesh::Point(-1, 1, -1));
83
84
85 // generate (quadrilateral) faces
86
87 std::vector<MyMesh::VertexHandle> tmp_face_vhandles;
88
89 tmp_face_vhandles.clear();
90 tmp_face_vhandles.push_back(vhandle[0]);
91 tmp_face_vhandles.push_back(vhandle[1]);
92 tmp_face_vhandles.push_back(vhandle[2]);
93 tmp_face_vhandles.push_back(vhandle[3]);
94 fhandle[0] = mesh.add_face(tmp_face_vhandles);
95
96 tmp_face_vhandles.clear();
97 tmp_face_vhandles.push_back(vhandle[7]);
98 tmp_face_vhandles.push_back(vhandle[6]);
99 tmp_face_vhandles.push_back(vhandle[5]);
100 tmp_face_vhandles.push_back(vhandle[4]);
101 fhandle[1] = mesh.add_face(tmp_face_vhandles);
102
103 tmp_face_vhandles.clear();
104 tmp_face_vhandles.push_back(vhandle[1]);
105 tmp_face_vhandles.push_back(vhandle[0]);
106 tmp_face_vhandles.push_back(vhandle[4]);
107 tmp_face_vhandles.push_back(vhandle[5]);
108 fhandle[2] = mesh.add_face(tmp_face_vhandles);
109
110
111 tmp_face_vhandles.clear();
112 tmp_face_vhandles.push_back(vhandle[2]);
113 tmp_face_vhandles.push_back(vhandle[1]);
114 tmp_face_vhandles.push_back(vhandle[5]);
115 tmp_face_vhandles.push_back(vhandle[6]);
116 fhandle[3] = mesh.add_face(tmp_face_vhandles);
117
118
119 tmp_face_vhandles.clear();
120 tmp_face_vhandles.push_back(vhandle[3]);
121 tmp_face_vhandles.push_back(vhandle[2]);
122 tmp_face_vhandles.push_back(vhandle[6]);
123 tmp_face_vhandles.push_back(vhandle[7]);
124 fhandle[4] = mesh.add_face(tmp_face_vhandles);
125
126
127 tmp_face_vhandles.clear();
128 tmp_face_vhandles.push_back(vhandle[0]);
129 tmp_face_vhandles.push_back(vhandle[3]);
130 tmp_face_vhandles.push_back(vhandle[7]);
131 tmp_face_vhandles.push_back(vhandle[4]);
132 fhandle[5] = mesh.add_face(tmp_face_vhandles);
133
134 // And now delete all faces and vertices
135 // except face (vh[7], vh[6], vh[5], vh[4])
136 // whose handle resides in fhandle[1]
137
138
139 // Delete face 0
140 mesh.delete_face(fhandle[0], false);
141 // ... face 2
142 mesh.delete_face(fhandle[2], false);
143 // ... face 3
144 mesh.delete_face(fhandle[3], false);
145 // ... face 4
146 mesh.delete_face(fhandle[4], false);
147 // ... face 5
148 mesh.delete_face(fhandle[5], false);
149
150
151 // If isolated vertices result in a face deletion
152 // they have to be deleted manually. If you want this
153 // to happen automatically, change the second parameter
154 // to true.
155
156 // Now delete the isolated vertices 0, 1, 2 and 3
157 mesh.delete_vertex(vhandle[0], false);
158 mesh.delete_vertex(vhandle[1], false);
159 mesh.delete_vertex(vhandle[2], false);
160 mesh.delete_vertex(vhandle[3], false);
161
162 // Delete all elements that are marked as deleted
163 // from memory.
164 mesh.garbage_collection();
165
166 // write mesh to output.obj
167 try {
168 if ( !OpenMesh::IO::write_mesh(mesh, "output.off") ) {
169 std::cerr << "Cannot write mesh to file 'output.off'" << std::endl;
170 return 1;
171 }
172 }
173 catch( std::exception& x )
174 {
175 std::cerr << x.what() << std::endl;
176 return 1;
177 }
178
179 return 0;
180 }
OpenMesh::TriMesh_ArrayKernelT
Definition: PolyMesh_ArrayKernelT.hh:73
OpenMesh::PolyMeshT::Point
Kernel::Point Point
Coordinate type.
Definition: PolyMeshT.hh:112
OpenMesh::PolyMeshT::add_vertex
VertexHandle add_vertex(const Point &_p)
Alias for new_vertex(const Point&).
Definition: PolyMeshT.hh:235
OpenMesh::IO::write_mesh
bool write_mesh(const Mesh &_mesh, const std::string &_filename, Options _opt=Options::Default, std::streamsize _precision=6)
Write a mesh to the file _filename.
Definition: MeshIO.hh:207
OpenMesh::DefaultTraits
Definition: Traits.hh:121
OpenMesh::PolyMeshT::VertexHandle
Kernel::VertexHandle VertexHandle
Handle for referencing the corresponding item.
Definition: PolyMeshT.hh:136
config.h
OpenMesh::PolyMesh_ArrayKernelT
Definition: PolyMesh_ArrayKernelT.hh:94
OpenMesh::Attributes::Status
Add status to mesh item (all items)
Definition: Attributes.hh:85
MyTraits
Definition: mymesh.cc:5