Nef_3/handling_double_coordinates.cpp

#include <CGAL/Exact_predicates_exact_constructions_kernel.h>
#include <CGAL/Polyhedron_3.h>
#include <CGAL/IO/Polyhedron_iostream.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;
  }
}