Tetraedriser.cpp

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#include <Tetraedriser.h>
 
Implemente_instanciable(Tetraedriser, "Tetraedriser", Triangulation_base);
// XD tetraedriser interprete tetraedriser INHERITS_BRACE To achieve a tetrahedral mesh based on a mesh comprising
// XD_CONT blocks, the Tetraedriser (Tetrahedralise) interpretor is used in VEF discretization. Initial block is divided
// XD_CONT in 6 tetrahedra: \includeimage{{tetraedriser.jpeg}}
// XD attr domain_name ref_domaine domain_name REQ Name of domain.
 
 
Sortie& Tetraedriser::printOn(Sortie& os) const { return Interprete::printOn(os); }
 
Entree& Tetraedriser::readOn(Entree& is) { return Interprete::readOn(is); }
 
/*! @brief Function outside class Cuts all faces of a Faces object
 *
 *     whose faces have 4 vertices
 *     into 2 faces with 3 vertices.
 *
 * @param (Faces& faces) the set of faces to cut
 */
static void decoupe(Faces& faces)
{
  IntTab& sommets = faces.les_sommets();
  int nb_faces = sommets.dimension(0);
  assert(sommets.dimension(1) == 4);
  IntTab nouveaux(2 * nb_faces, 3);
  faces.voisins().resize(2 * nb_faces, 2);
  faces.voisins() = -1;
  for (int i = 0; i < nb_faces; i++)
    {
      int i1 = sommets(i, 0);
      int i2 = sommets(i, 1);
      int i3 = sommets(i, 2);
      int i4 = sommets(i, 3);
      nouveaux(i, 0) = i1;
      nouveaux(i, 1) = i2;
      nouveaux(i, 2) = i3;
      nouveaux(nb_faces + i, 0) = i2;
      nouveaux(nb_faces + i, 1) = i3;
      nouveaux(nb_faces + i, 2) = i4;
    }
  sommets.ref(nouveaux);
}
 
/*! @brief Tetrahedralizes all elements of a domain: transforms the geometric elements of the domain into tetrahedra.
 *
 *     For now we can only tetrahedralize Hexahedra.
 *     (we cut them into 2).
 *     The elements are tetrahedralized and all boundaries
 *     are typed as Triangle_3D.
 *
 * @param (Domaine& domaine) the domain whose elements we want to tetrahedralize
 * @throws we do not know how to tetrahedralize elements
 * of this geometric type
 */
void Tetraedriser::trianguler(Domaine& domaine) const
{
  if (domaine.type_elem()->que_suis_je() == "Hexaedre")
    {
      domaine.typer("Tetraedre");
      IntTab& les_elems = domaine.les_elems();
      int oldsz = les_elems.dimension(0);
      IntTab new_elems(6 * oldsz, 4);
      for (int i = 0; i < oldsz; i++)
        {
          int i0 = les_elems(i, 0);
          int i1 = les_elems(i, 1);
          int i2 = les_elems(i, 2);
          int i3 = les_elems(i, 3);
          int i4 = les_elems(i, 4);
          int i5 = les_elems(i, 5);
          int i6 = les_elems(i, 6);
          int i7 = les_elems(i, 7);
          {
            new_elems(i, 0) = i0;
            new_elems(i, 1) = i1;
            new_elems(i, 2) = i2;
            new_elems(i, 3) = i4;
 
            new_elems(i + oldsz, 0) = i1;
            new_elems(i + oldsz, 1) = i2;
            new_elems(i + oldsz, 2) = i3;
            new_elems(i + oldsz, 3) = i6;
            mettre_a_jour_sous_domaine(domaine, i, i + oldsz, 1);
 
            new_elems(i + 2 * oldsz, 0) = i1;
            new_elems(i + 2 * oldsz, 1) = i2;
            new_elems(i + 2 * oldsz, 2) = i4;
            new_elems(i + 2 * oldsz, 3) = i6;
            mettre_a_jour_sous_domaine(domaine, i, i + 2 * oldsz, 1);
 
            new_elems(i + 3 * oldsz, 0) = i3;
            new_elems(i + 3 * oldsz, 1) = i5;
            new_elems(i + 3 * oldsz, 2) = i6;
            new_elems(i + 3 * oldsz, 3) = i7;
            mettre_a_jour_sous_domaine(domaine, i, i + 3 * oldsz, 1);
 
            new_elems(i + 4 * oldsz, 0) = i1;
            new_elems(i + 4 * oldsz, 1) = i4;
            new_elems(i + 4 * oldsz, 2) = i5;
            new_elems(i + 4 * oldsz, 3) = i6;
            mettre_a_jour_sous_domaine(domaine, i, i + 4 * oldsz, 1);
 
            new_elems(i + 5 * oldsz, 0) = i1;
            new_elems(i + 5 * oldsz, 1) = i3;
            new_elems(i + 5 * oldsz, 2) = i5;
            new_elems(i + 5 * oldsz, 3) = i6;
            mettre_a_jour_sous_domaine(domaine, i, i + 5 * oldsz, 1);
          }
        }
      les_elems.ref(new_elems);
    }
  else
    {
      Cerr << "We do not yet know how to Tetraedriser the " << domaine.type_elem()->que_suis_je() << "s" << finl;
      Cerr << "Try to use Tetraedriser_homogene_compact instead." << finl;
      Process::exit();
    }
 
  for (auto &itr : domaine.faces_bord())
    {
      Faces& les_faces = itr.faces();
      les_faces.typer(Type_Face::triangle_3D);
      decoupe(les_faces);
    }
 
  for (auto &itr : domaine.faces_raccord())
    {
      Faces& les_faces = itr->faces();
      les_faces.typer(Type_Face::triangle_3D);
      decoupe(les_faces);
    }
 
  for (auto &itr : domaine.bords_int())
    {
      Faces& les_faces = itr.faces();
      les_faces.typer(Type_Face::triangle_3D);
      decoupe(les_faces);
    }
 
  for (auto &itr : domaine.groupes_faces())
    {
      Faces& les_faces = itr.faces();
      les_faces.typer(Type_Face::triangle_3D);
      decoupe(les_faces);
    }
}