MeshRepairPluginT_impl.hh

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#define MESHREPAIRPLUGINT_CC
 
#include "MeshRepairPlugin.hh"
 
//-----------------------------------------------------------------------------
 
template<typename MeshT>
void MeshRepairPlugin::flipOrientation(MeshT& _mesh)
{
 
 
  std::vector< unsigned int >                 valence;
  std::vector< typename MeshT::VertexHandle > vhandles;
 
 
 
  bool selected = false;
 
  // Check if a face is selected
  for (auto f_it : _mesh.faces())
    if ( _mesh.status(f_it).selected() ) {
      selected = true;
      break;
    }
 
  // Two ways to go
  // if something is selected, we have to duplicate some vertices in order to get a manifold mesh
  if ( selected ) {
 
    // Tag all vertices adjacent to selected faces
    for (auto v_it : _mesh.vertices()) {
 
      bool tagged = false;
 
      for (typename MeshT::VertexFaceIter vf_it = _mesh.vf_iter(v_it); !tagged && vf_it.is_valid(); ++vf_it)
        if (_mesh.status(*vf_it).selected())
           tagged = true;
 
      _mesh.status(v_it).set_tagged(tagged);
    }
 
    // Remember the vertex mapping for the duplication
    OpenMesh::VPropHandleT< typename MeshT::VHandle>  vmap;
    _mesh.add_property(vmap);
 
    // duplicate vertices that are incident to tagged and un-tagged faces
    for (auto v_it : _mesh.vertices()) {
 
      typename MeshT::VertexHandle vh = v_it;
 
      if (_mesh.status(v_it).tagged() )
        for (auto vf_it : v_it.faces())
 
          if (!_mesh.status(vf_it).tagged()) {
 
            typename MeshT::Point tmpPoint = _mesh.point(v_it);
 
            // Duplicate the vertex
            vh = _mesh.add_vertex( tmpPoint );
 
            // The next vertex should be tagged
            _mesh.status(vh).set_tagged(true);
 
            // The original vertex is already duplicated, so we don't need to do it again!
            _mesh.status(v_it).set_tagged(false);
            break;
          }
 
      _mesh.property(vmap, v_it) = vh;
    }
 
    // Delete the old faces and collect their information
    for (auto f_it : _mesh.faces()) {
 
      if (_mesh.status(f_it).selected()) {
 
        // Collect vertex handles
        typename MeshT::FaceVertexIter fv_it = _mesh.fv_iter(f_it);
 
        valence.push_back(f_it.valence());
        while (fv_it.is_valid()) {
          vhandles.push_back(*fv_it);
          ++fv_it;
        }
 
        // delete the corresponding face
        _mesh.delete_face(f_it, false);
      }
 
    }
 
    // Rebuild the faces in the opposite order
    std::size_t pos = 0;
    for (std::size_t i = 0; i < valence.size(); i++) {
 
      std::vector<typename MeshT::VertexHandle> faceVertices;
 
      pos += valence[i];
 
      // add valence vertices in the inverse order
      for (unsigned int j = 1; j <= valence[i]; ++j)
        faceVertices.push_back(_mesh.property(vmap,vhandles[pos - j]) );
 
      _mesh.add_face(faceVertices);
    }
 
    _mesh.remove_property(vmap);
 
  } else {
 
    std::vector < typename MeshT::Point > points;
 
    // store vertices
    points.reserve(_mesh.n_vertices() );
    for (auto v_it : _mesh.vertices())
      points.push_back(_mesh.point(v_it));
 
    // Better approximation of vector size for storing the handles
    const unsigned int n_VerticesPerFace = _mesh.is_trimesh() ? 3 : 4;
 
    // Remember vertex handles for each face and its valence
    std::vector< typename MeshT::VertexHandle > vhandles;
    vhandles.reserve( _mesh.n_faces() * n_VerticesPerFace);
    for (auto f_it : _mesh.faces()) {
 
      valence.push_back( f_it.valence() );
 
      for (auto fv_it : f_it.vertices())
        vhandles.push_back(fv_it);
    }
 
    // Remove all entities from the mesh
    _mesh.clean();
 
    // Restore vertices
    for (unsigned int i = 0; i < points.size(); ++i)
      _mesh.add_vertex(points[i]);
 
 
    // Add back the faces
    std::size_t pos = 0;
    for (std::size_t i = 0; i < valence.size(); i++) {
 
      std::vector<typename MeshT::VertexHandle> faceVertices;
 
      pos += valence[i];
 
      // add valence vertices in the inverse order
      for (unsigned int j = 1; j <= valence[i]; ++j)
        faceVertices.push_back(vhandles[pos - j]);
 
      _mesh.add_face(faceVertices);
    }
 
  }
 
 
  _mesh.garbage_collection();
  _mesh.update_normals();
}
 
//-----------------------------------------------------------------------------