obj_export.cpp

  std::ofstream aFile ( "Mesh.obj" );

  for (int i = 0; i < aMesh->numVertices(); ++i) {
    aFile << "v " << aMesh->vertices()[i].x() << " "
                  << aMesh->vertices()[i].y() << " "
                  << aMesh->vertices()[i].z() << std::endl;
  }

  for (int i = 0; i < aMesh->numVertices(); ++i) {
    aFile << "vn " << aMesh->normals()[i].x() << " "
                   << aMesh->normals()[i].y() << " "
                   << aMesh->normals()[i].z() << std::endl;
  }

  for (int i = 0; i < aMesh->numElements(); ++i) {
    aFile << "f " << (aMesh->elements()[i].x() + 1) << " "
                  << (aMesh->elements()[i].y() + 1) << " "
                  << (aMesh->elements()[i].z() + 1) << std::endl;
  }
  aFile.close();