NonManifoldVertexFixingT_impl.hh

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//=============================================================================
//
//  CLASS MeshFixing - IMPLEMENTATION
//
//=============================================================================
 
#define NONMANIFOLDVERTEXFIXING_CC
 
//== INCLUDES =================================================================
 
#include "NonManifoldVertexFixingT.hh"
 
//== NAMESPACE ===============================================================
 
 
//== IMPLEMENTATION ==========================================================
 
 
template<class MeshT>
NonManifoldVertexFixingT<MeshT>::NonManifoldVertexFixingT(MeshT& _mesh ) :
mesh_(_mesh)
{
}
 
 
template<class MeshT>
void NonManifoldVertexFixingT<MeshT>::fix()
{
 
  OpenMesh::FPropHandleT< size_t > component;
  if ( !mesh_.get_property_handle(component,"component") )
    mesh_.add_property(component, "component");
 
  for (auto v_iter : mesh_.vertices())
  {
    // unmark all faces
    for (auto vf_iter : v_iter.faces())
      mesh_.property(component,vf_iter) = 0;
 
    size_t componentCount = 1;
 
 
    //search and isolate new components
    //shared vertices will be duplicated
    for (auto vf_iter : v_iter.faces())
    {
      //get the first face in the component
      std::vector<typename MeshT::FaceHandle> checkNeighbour;
      if(mesh_.property(component,vf_iter) == 0)
      {
        mesh_.property(component,vf_iter) = componentCount;
        checkNeighbour.push_back(vf_iter);
      }
 
      // if a reference face was found, a new component exists
      // and a new vertex is required (except for the first component)
      typename MeshT::VertexHandle v_new;
      if (componentCount > 1 && !checkNeighbour.empty())
      {
        typename MeshT::Point p = mesh_.point(v_iter);
        v_new = mesh_.add_vertex(p);
      }
 
      // check all adjacent faces of our reference
      while(!checkNeighbour.empty())
      {
        typename MeshT::FaceHandle face = checkNeighbour.back();
        checkNeighbour.pop_back();
 
        std::vector<typename MeshT::VertexHandle> f_vertices;
        // get all neighbor faces of face
        for (auto fv_iter : make_smart(face, mesh_).vertices())
        {
          f_vertices.push_back(fv_iter);
          if (fv_iter != v_iter)
          {
            //find the next neighbor face over edge v_iter and fv_iter
            typename MeshT::FaceHandle nf;
            for (auto nf_iter : v_iter.faces())
            {
              if (nf_iter != face)
                for (auto nfv_iter: nf_iter.vertices())
                {
                  if (nf.is_valid()) break;
                  if (nfv_iter == fv_iter)
                    nf = nf_iter;
                }
            }
 
            //if such a face was found, it is in the same component as the reference face
            if (nf.is_valid() && !mesh_.property(component,nf))
            {
              mesh_.property(component,nf) = componentCount;
              checkNeighbour.push_back(nf);
            }
          }
        }
 
        //if one face wasn't found in the component = 1 run, then it is a new component, due to split
        if (componentCount > 1 && v_new.is_valid())
        {
          std::replace(f_vertices.begin(),f_vertices.end(),typename MeshT::VertexHandle(v_iter),v_new);
 
          mesh_.delete_face(face,false);
          mesh_.add_face(f_vertices);
 
        }
      }
 
      // all faces which belong to v_iter and inside same component found
      // the next face will be in a new component
      ++componentCount;
    }
  }
 
  mesh_.remove_property(component);
  mesh_.garbage_collection();
 
}