chi_surfacemesh_extractopenedges.cc

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#include "chi_surfacemesh.h"
 
#include "chi_runtime.h"
#include "chi_log.h"
 
#include <set>
#include <fstream>
 
//###################################################################
/**Extract open edges to wavefront obj format.*/
void chi_mesh::SurfaceMesh::ExtractOpenEdgesToObj(const char *fileName)
{
  std::vector<std::pair<int,int>> edges;
  for (auto face : poly_faces_)
  {
    for (auto edge : face->edges)
    {
      if (edge[2]<0)
      {
        edges.push_back(std::pair<int,int>(edge[0],edge[1]));
      }
    }//for edge
  }//for face
 
  std::ofstream outfile;
  outfile.open(fileName);
 
  if (!outfile.is_open())
  {
    Chi::log.LogAllError()
      << "In call to chi_mesh::SurfaceMesh::ExtractOpenEdgesToObj. Failed"
      << " to open file: " << std::string(fileName);
    Chi::Exit(EXIT_FAILURE);
  }
 
  outfile << "# ChiTech open edges file\n";
  outfile << "# Single surface mesh\n";
 
  for (auto vert_pair : edges)
  {
    chi_mesh::Vertex& v0 = vertices_[vert_pair.first];
    chi_mesh::Vertex& v1 = vertices_[vert_pair.second];
    outfile
      << "v " << v0.x << " " << v0.y << " " << v0.z << "\n"
      << "v " << v1.x << " " << v1.y << " " << v1.z << "\n";
  }
 
  for (size_t e = 0; e < edges.size(); ++e)
  {
    const auto v_count = 2 * e + 1;
    outfile << "l " << v_count << " " << v_count + 1 << "\n";
  }
 
 
  outfile.close();
}