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#include <iostream>
// --------------------
#include <OpenMesh/Core/IO/MeshIO.hh>
#include <OpenMesh/Core/Mesh/TriMesh_ArrayKernelT.hh>
typedef OpenMesh::TriMesh_ArrayKernelT<> MyMesh;
int main(int argc, char **argv)
{
MyMesh mesh;
if (argc!=2)
{
std::cerr << "Usage: " << argv[0] << " <input>\n";
return 1;
}
// request vertex normals, so the mesh reader can use normal information
// if available
mesh.request_vertex_normals();
// assure we have vertex normals
if (!mesh.has_vertex_normals())
{
std::cerr << "ERROR: Standard vertex property 'Normals' not available!\n";
return 1;
}
OpenMesh::IO::Options opt;
if ( ! OpenMesh::IO::read_mesh(mesh,argv[1], opt))
{
std::cerr << "Error loading mesh from file " << argv[1] << std::endl;
return 1;
}
// If the file did not provide vertex normals, then calculate them
if ( !opt.check( OpenMesh::IO::Options::VertexNormal ) )
{
// we need face normals to update the vertex normals
mesh.request_face_normals();
// let the mesh update the normals
mesh.update_normals();
// dispose the face normals, as we don't need them anymore
mesh.release_face_normals();
}
// move all vertices one unit length along it's normal direction
for (MyMesh::VertexIter v_it = mesh.vertices_begin();
v_it != mesh.vertices_end(); ++v_it)
{
std::cout << "Vertex #" << *v_it << ": " << mesh.point( *v_it );
mesh.set_point( *v_it, mesh.point(*v_it)+mesh.normal(*v_it) );
std::cout << " moved to " << mesh.point( *v_it ) << std::endl;
}
// don't need the normals anymore? Remove them!
mesh.release_vertex_normals();
// just check if it really works
if (mesh.has_vertex_normals())
{
std::cerr << "Ouch! ERROR! Shouldn't have any vertex normals anymore!\n";
return 1;
}
return 0;
}
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