Developer Documentation

delete_geometry.cc
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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::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::PolyMeshT::Point
Kernel::Point Point
Coordinate type.
Definition: PolyMeshT.hh:112
OpenMesh::TriMesh_ArrayKernelT
Definition: PolyMesh_ArrayKernelT.hh:73
config.h
OpenMesh::Attributes::Status
Add status to mesh item (all items)
Definition: Attributes.hh:85
OpenMesh::PolyMesh_ArrayKernelT
Definition: PolyMesh_ArrayKernelT.hh:94
OpenMesh::PolyMeshT::add_vertex
SmartVertexHandle add_vertex(const Point &_p)
Alias for new_vertex(const Point&).
Definition: PolyMeshT.hh:235
MyTraits
Definition: mymesh.cc:5
OpenMesh::DefaultTraits
Definition: Traits.hh:121
OpenMesh::PolyMeshT::VertexHandle
Kernel::VertexHandle VertexHandle
Handle for referencing the corresponding item.
Definition: PolyMeshT.hh:136