Polyedre_poly.cpp

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#include <Polyedre_poly.h>
#include <Polyedre.h>
#include <Domaine.h>
#include <Linear_algebra_tools_impl.h>
 
Implemente_instanciable(Polyedre_poly,"Polyedre_poly",Elem_poly_base);
 
 
Sortie& Polyedre_poly::printOn(Sortie& s ) const { return s << que_suis_je() << finl; }
 
Entree& Polyedre_poly::readOn(Entree& s ) { return s ; }
 
void Polyedre_poly::normale(int num_Face,DoubleTab& Face_normales,
                            const IntTab& Face_sommets,
                            const IntTab& Face_voisins,
                            const IntTab& elem_faces,
                            const Domaine& domaine_geom) const
{
 
  //Cerr << " num_Face " << num_Face << finl;
  const DoubleTab& les_coords = domaine_geom.coord_sommets();
 
  // Cerr << "les face sommet " << Face_sommets << finl;
 
 
  int nb_som_face_max= Face_sommets.dimension(1);
  int n0 = Face_sommets(num_Face,0);
 
  const IntTab& elem=domaine_geom.les_elems();
  Vecteur3 n(0,0,0);
  Vecteur3 moinsS0(les_coords(n0,0),les_coords(n0,1),les_coords(n0,2));
  moinsS0*=-1;
  for (int s=1; s<nb_som_face_max-1 ; s++)
    {
      int n1 = Face_sommets(num_Face,s);
      int n2 = Face_sommets(num_Face,s+1);
      if (n2<0)
        {
          break;
        }
      Vecteur3 S1(les_coords(n1,0),les_coords(n1,1),les_coords(n1,2));
      Vecteur3 S2(les_coords(n2,0),les_coords(n2,1),les_coords(n2,2));
      S1+=moinsS0;
      S2+=moinsS0;
      Vecteur3 nTr;
      Vecteur3::produit_vectoriel(S1,S2,nTr);
      n+=nTr;
    }
  n*=0.5;
 
  /*
    int elem1=Face_voisins(num_Face,0);
  DoubleVect xp;
  ref_cast(Poly_geom_base,domaine_geom.type_elem().valeur()).calculer_un_centre_gravite(elem1,xp);
  Vecteur3 M(xp(0),xp(1),xp(2));
  */
  // on prend un point a l'interieur (pas le cg trop long)
 
  int num_poly=Face_voisins(num_Face,0);
 
  Vecteur3 xg(0,0,0);
  int nb_som_max=elem.dimension(1);
  int nb_som_reel;
  for (nb_som_reel=0; nb_som_reel<nb_som_max; nb_som_reel++)
    {
      int ns=elem(num_poly,nb_som_reel);
      if (ns<0)
        break;
      Vecteur3 S(les_coords(ns,0),les_coords(ns,1),les_coords(ns,2));
      xg+=S;
    }
  xg*=1./nb_som_reel;
 
 
  xg+=moinsS0;
  double prod_scal=Vecteur3::produit_scalaire(n,xg);
  if ( (prod_scal) > 0 )
    {
      n*=-1;
    }
 
 
  Face_normales(num_Face,0) = n[0];
  Face_normales(num_Face,1) = n[1];
  Face_normales(num_Face,2) = n[2];
 
  // double s=sqrt(Vecteur3::produit_scalaire(n,n));
  // Cerr << "Face_normales " << num_Face<< " s "<< s << finl;
  // assert(s>0);
  //  Cerr << "Face_normales " << num_Face<< " s "<< s << finl;
 
}