How to copy a surface mesh in CGAL - mesh

Question

I want to copy a mesh with the function copy_face_graph(source, target). But the target mesh is different (it has same number of vertices and faces, but the coordinates and the order are totally different).
The code:
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Exact_predicates_exact_constructions_kernel.h>
#include <CGAL/Surface_mesh.h>
#include <iostream>
#include <fstream>
#include <CGAL/boost/graph/copy_face_graph.h>
typedef CGAL::Exact_predicates_inexact_constructions_kernel Kernel;
typedef CGAL::Surface_mesh<Kernel::Point_3> Mesh;
namespace PMP = CGAL::Polygon_mesh_processing;
int main(int argc, char* argv[]) {
const char* filename1 = (argc > 1) ? argv[1] : "data/blobby.off";
std::cout << ".off loaded" << std::endl;
std::ifstream input(filename1);
Mesh mesh_orig;
if (!input || !(input >> mesh_orig))
{
std::cerr << "First mesh is not a valid off file." << std::endl;
return 1;
}
input.close();
// ========================================================
Mesh mesh_copy;
CGAL::copy_face_graph(mesh_orig, mesh_copy);
// ========================================================
std::ofstream mesh_cpy("CPY_ANYLYZE/mesh_copy.off");
mesh_cpy << mesh_copy;
mesh_cpy.close();
return 0;
}
Dose anyone knows how to get a complete same mesh from the original mesh? Do I need add the named parameters, or maybe using another function?
Thanks a lot

Answer 1

Except if you intend to write some code working with different data structures, you can use the copy constructor from the Surface_mesh class, Mesh mesh_copy(mesh_orig). copy_face_graph does not do a raw copy because it works also if the input and output are of different types. However the output should be the same up to the order of the simplices.