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[chengming_26 <>]

typedef CGAL::Gmpz                      NT;
typedef CGAL::Quotient<NT>              CNT;
typedef CGAL::Cartesian<CNT>            CKernel;
typedef CGAL::Homogeneous<NT>           Kernel;
typedef CGAL::Nef_polyhedron_3<Kernel>  Nef_polyhedron;

 

typedef CGAL::Polyhedron_3<Kernel>                     Polyhedron;
typedef Polyhedron::Facet_iterator                     Facet_iterator;

 

struct Normal_vector {
 template <class Facet>
 typename Facet::Plane_3 operator()( Facet& f)
 {
  typename Facet::Halfedge_handle h = f.halfedge();
  // Facet::Plane_3 is the normal vector type. We assume the
  // CGAL Kernel here and use its global functions.
  return CGAL::cross_product(
   h->next()->vertex()->point() - h->vertex()->point(),
   h->next()->next()->vertex()->point() - h->next()->vertex()->point());
 }
};

 

 main()

{

    ............ //the code of geting "Nef_polyhedron& result" omit；

    Polyhedron P;
    result.convert_to_Polyhedron(P);

 

    for (Facet_iterator itr = P.facets_begin(); itr != P.facets_end(); ++itr)
   {

     std::cout<<CGAL::to_double(Normal_vector()(*itr).hx())<<" "<<
     CGAL::to_double(Normal_vector()(*itr).hy())<<" "<<
     CGAL::to_double(Normal_vector()(*itr).hz())<<"\n";

   }

}

why are these error?

 

error C2039: 'hx' : is not a member of 'CGAL::Plane_3<R_>'
1>        with
1>        [
1>            R_=CGAL::Homogeneous<NT>
1>        ]
1>e:\study\c++\cgal_vh\cgal_vh\../Polyhedron/VisualHullComputer.h(271) : error C2039: 'hy' : is not a member of 'CGAL::Plane_3<R_>'
1>        with
1>        [
1>            R_=CGAL::Homogeneous<NT>
1>        ]
1>e:\study\c++\cgal_vh\cgal_vh\../Polyhedron/VisualHullComputer.h(272) : error C2039: 'hz' : is not a member of 'CGAL::Plane_3<R_>'
1>        with
1>        [
1>            R_=CGAL::Homogeneous<NT>
1>        ]

 

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