Tetraedriser_par_prisme.cpp

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#include <Tetraedriser_par_prisme.h>
#include <Domaine.h>
 
Implemente_instanciable(Tetraedriser_par_prisme, "Tetraedriser_par_prisme", Triangulation_base);
// XD tetraedriser_par_prisme tetraedriser tetraedriser_par_prisme INHERITS_BRACE Tetraedriser_par_prisme generates 6
// XD_CONT iso-volume tetrahedral element from primary hexahedral one (contrarily to the 5 elements ordinarily generated
// XD_CONT by tetraedriser). This element is suitable for calculation of gradients at the summit (coincident with the
// XD_CONT gravity centre of the jointed elements related with) and spectra (due to a better alignment of the points).
// XD_CONT \includeimage{{tetraedriserparprisme.jpeg}} NL2 \includeimage{{tetraedriserparprisme2.jpeg}} NL2 Initial
// XD_CONT block is divided in 6 prismes.
 
 
Sortie& Tetraedriser_par_prisme::printOn(Sortie& os) const { return Interprete::printOn(os); }
 
Entree& Tetraedriser_par_prisme::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(Domaine& dom, Faces& faces)
{
  const DoubleTab& coord = dom.coord_sommets();
 
  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);
 
      // This is a face with X constant
      if ((coord(i1, 0) == coord(i2, 0)) && (coord(i1, 0) == coord(i3, 0)))
        {
          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;
        }
 
      // This is a face with Z constant
      if ((coord(i1, 2) == coord(i2, 2)) && (coord(i1, 2) == coord(i3, 2)))
        {
          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;
        }
      // This is a face with Y constant
      if ((coord(i1, 1) == coord(i2, 1)) && (coord(i1, 1) == coord(i3, 1)))
        {
          nouveaux(i, 0) = i1;
          nouveaux(i, 1) = i2;
          nouveaux(i, 2) = i4;
          nouveaux(nb_faces + i, 0) = i1;
          nouveaux(nb_faces + i, 1) = i3;
          nouveaux(nb_faces + i, 2) = i4;
        }
 
    }
  sommets.ref(nouveaux);
}
 
/*! @brief @brief Tetrahedralises all elements of a domain: transforms the geometric elements of the domain into IDENTICAL tetrahedra
 *
 *     using the prism method.
 *     Currently only Hexaedre elements can be tetrahedralised
 *     (they are split into 2).
 *     All elements are tetrahedralised and all boundaries
 *     are typed as Triangle_3D.
 *
 * @param domaine The domain whose elements are to be tetrahedralised.
 * @throws Cannot tetrahedralise by prism the geometric elements of this type.
 */
void Tetraedriser_par_prisme::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) = i5;
 
            new_elems(i + oldsz, 0) = i0;
            new_elems(i + oldsz, 1) = i2;
            new_elems(i + oldsz, 2) = i4;
            new_elems(i + oldsz, 3) = i5;
            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) = i3;
            new_elems(i + 2 * oldsz, 3) = i5;
            mettre_a_jour_sous_domaine(domaine, i, i + 2 * oldsz, 1);
 
            new_elems(i + 3 * oldsz, 0) = i2;
            new_elems(i + 3 * oldsz, 1) = i3;
            new_elems(i + 3 * oldsz, 2) = i5;
            new_elems(i + 3 * oldsz, 3) = i7;
            mettre_a_jour_sous_domaine(domaine, i, i + 3 * oldsz, 1);
 
            new_elems(i + 4 * oldsz, 0) = i2;
            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) = i2;
            new_elems(i + 5 * oldsz, 1) = i5;
            new_elems(i + 5 * oldsz, 2) = i6;
            new_elems(i + 5 * oldsz, 3) = i7;
            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_par_prisme the " << domaine.type_elem()->que_suis_je() << "s" << finl;
 
  for (auto &itr : domaine.faces_bord())
    {
      Faces& les_faces = itr.faces();
      les_faces.typer(Type_Face::triangle_3D);
      decoupe(domaine, les_faces);
    }
 
  for (auto &itr : domaine.faces_raccord())
    {
      Faces& les_faces = itr->faces();
      les_faces.typer(Type_Face::triangle_3D);
      decoupe(domaine, les_faces);
    }
 
  for (auto &itr : domaine.bords_int())
    {
      Faces& les_faces = itr.faces();
      les_faces.typer(Type_Face::triangle_3D);
      decoupe(domaine, les_faces);
    }
 
  for (auto &itr : domaine.groupes_faces())
    {
      Faces& les_faces = itr.faces();
      les_faces.typer(Type_Face::triangle_3D);
      decoupe(domaine, les_faces);
    }
}