Developer Documentation
properties.cc
1 #include <iostream>
2 // --------------------
3 #include <OpenMesh/Core/IO/MeshIO.hh>
4 #include <OpenMesh/Core/Mesh/TriMesh_ArrayKernelT.hh>
5 
6 
8 
9 
10 int main(int argc, char **argv)
11 {
12  MyMesh mesh;
13 
14  if (argc!=2)
15  {
16  std::cerr << "Usage: " << argv[0] << " <input>\n";
17  return 1;
18  }
19 
20  // request vertex normals, so the mesh reader can use normal information
21  // if available
22  mesh.request_vertex_normals();
23 
24  // assure we have vertex normals
25  if (!mesh.has_vertex_normals())
26  {
27  std::cerr << "ERROR: Standard vertex property 'Normals' not available!\n";
28  return 1;
29  }
30 
32  if ( ! OpenMesh::IO::read_mesh(mesh,argv[1], opt))
33  {
34  std::cerr << "Error loading mesh from file " << argv[1] << std::endl;
35  return 1;
36  }
37 
38  // If the file did not provide vertex normals, then calculate them
39  if ( !opt.check( OpenMesh::IO::Options::VertexNormal ) )
40  {
41  // we need face normals to update the vertex normals
42  mesh.request_face_normals();
43 
44  // let the mesh update the normals
45  mesh.update_normals();
46 
47  // dispose the face normals, as we don't need them anymore
48  mesh.release_face_normals();
49  }
50 
51  // move all vertices one unit length along it's normal direction
52  for (MyMesh::VertexIter v_it = mesh.vertices_begin();
53  v_it != mesh.vertices_end(); ++v_it)
54  {
55  std::cout << "Vertex #" << *v_it << ": " << mesh.point( *v_it );
56  mesh.set_point( *v_it, mesh.point(*v_it)+mesh.normal(*v_it) );
57  std::cout << " moved to " << mesh.point( *v_it ) << std::endl;
58  }
59 
60  // don't need the normals anymore? Remove them!
61  mesh.release_vertex_normals();
62 
63  // just check if it really works
64  if (mesh.has_vertex_normals())
65  {
66  std::cerr << "Ouch! ERROR! Shouldn't have any vertex normals anymore!\n";
67  return 1;
68  }
69 
70  return 0;
71 }
void update_normals()
Compute normals for all primitives.
Definition: PolyMeshT.cc:241
Has (r) / store (w) vertex normals.
Definition: Options.hh:109
bool read_mesh(Mesh &_mesh, const std::string &_filename)
Read a mesh from file _filename.
Definition: MeshIO.hh:104
Set options for reader/writer modules.
Definition: Options.hh:95