Octree_Double.tpp

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#ifndef Octree_Double_TPP_included
#define Octree_Double_TPP_included
 
/*! @brief Builds an octree from volumetric elements described by sets of vertices.
 *
 * Stores in the octree the bounding parallelepipeds of each
 *   element (containing all vertices of the element) plus a margin of epsilon.
 *   If include_virtual=1, stores elements.dimension_tot(0) elements, otherwise
 *   stores elements.dimension(0).
 *
 * Templated because the float version is needed for lata tools.
 *
 */
template<typename _SIZE_>
template<class _TAB_TYPE_>
void Octree_Double_32_64<_SIZE_>::build_elements(const _TAB_TYPE_& coords, const IntTab_t& elements,
                                                 const double epsilon, const bool include_virtual)
{
  octree_int_.reset();
  compute_origin_factors(coords, epsilon, include_virtual);
 
  const int_t nb_elems = include_virtual ? elements.dimension_tot(0) : elements.dimension(0);
  const int nb_som_elem = elements.dimension_int(1);
  const int dim = coords.dimension_int(1);
  IntTab_t elements_boxes;
  elements_boxes.resize(nb_elems, dim * 2, RESIZE_OPTIONS::NOCOPY_NOINIT);
  for (int_t i = 0; i < nb_elems; i++)
    {
      for (int j = 0; j < dim; j++)
        {
          double xmin = 1.e37;
          double xmax = -1.e37;
          for (int k = 0; k < nb_som_elem; k++)
            {
              const int_t som = elements(i, k);
              if (som < 0) continue; // for polyhedrons, som might be -1 (padding)
              const double x = coords(som, j);
              xmin = (x<xmin) ? x : xmin;
              xmax = (x>xmax) ? x : xmax;
            }
          int pos1 = 0, pos2 = 0;
          if (!integer_position(xmin, j, pos1) || !integer_position(xmax, j, pos2))
            {
              Cerr << "Fatal error in octree : integer position outside octree" << finl;
              Process::exit();
            }
          elements_boxes(i, j) = pos1;
          elements_boxes(i, j+dim) = pos2;
        }
    }
  octree_int_.build(dim, elements_boxes);
}
 
/*! @brief Helper method for build_nodes and build_elements: computes the conversion factors from real to integer coordinates for Octree_Int.
 *
 *   epsilon is added to the min and max coordinates for the octree bounding box.
 *
 * Templated because the float version is needed for lata tools.
 */
template<typename _SIZE_>
template<class _TAB_TYPE_>
void Octree_Double_32_64<_SIZE_>::compute_origin_factors(const _TAB_TYPE_& coords,
                                                         const double epsilon,
                                                         const int include_virtual)
{
  // Search for the min and max coordinates of the domain
  const int_t nb_som = include_virtual ? coords.dimension_tot(0) : coords.dimension(0);
  if (nb_som == 0) return; // empty octree
 
  dim_ = coords.dimension_int(1);
  origin_.resize_array(3);
  factor_.resize_array(3);
  ArrOfDouble_t xmin(dim_);
  xmin = 1.e37;
  ArrOfDouble_t xmax(dim_);
  xmax = -1.e-37;
  assert(dim_ >= 1 && dim_ <= 3);
  for (int_t i = 0; i < nb_som; i++)
    for (int j = 0; j < dim_; j++)
      {
        const double x = coords(i, j);
        if (x < xmin[j])
          xmin[j] = x;
        if (x > xmax[j])
          xmax[j] = x;
      }
 
  const double coord_max = (double) Octree_Int_32_64<_SIZE_>::coord_max_;
  for (int j = 0; j < dim_; j++)
    {
      xmin[j] -= epsilon;
      xmax[j] += epsilon;
      origin_[j] = xmin[j];
      if (xmax[j] - xmin[j] > 0.)
        factor_[j] = coord_max / (xmax[j] - xmin[j]);
      else
        factor_[j] = 0.;
    }
}
 
#endif