Nef_3/handling_double_coordinates.cpp

#include <CGAL/Exact_predicates_exact_constructions_kernel.h>
#include <CGAL/Polyhedron_3.h>
#include <CGAL/Nef_polyhedron_3.h>
#include <CGAL/IO/Nef_polyhedron_iostream_3.h>
 
typedef CGAL::Exact_predicates_exact_constructions_kernel Kernel;
typedef CGAL::Polyhedron_3<Kernel>  Polyhedron;
typedef CGAL::Nef_polyhedron_3<Kernel>  Nef_polyhedron;
 
int main() {
 
  Polyhedron P;
  std::cin >> P;
  Nef_polyhedron N(P);
 
  std::cout << "Exact_predicates_exact_constructions_kernel + SNC_indexed_items"
            << std::endl
            << "  allows efficient handling of input "
                 "using floating point coordinates"
            << std::endl;
 
  if(N.is_simple()) {
    N.convert_to_polyhedron(P);
    std::cout << P;
  }
  else {
    std::cout << N;
  }
}