spatial_hash.cpp

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#ifndef COAL_BROADPHASE_SPATIALHASH_INL_H
#define COAL_BROADPHASE_SPATIALHASH_INL_H
 
#include "coal/broadphase/detail/spatial_hash.h"
#include <algorithm>
 
namespace coal {
namespace detail {
 
//==============================================================================
SpatialHash::SpatialHash(const AABB& scene_limit_, CoalScalar cell_size_)
    : cell_size(cell_size_), scene_limit(scene_limit_) {
  width[0] =
      static_cast<unsigned int>(std::ceil(scene_limit.width() / cell_size));
  width[1] =
      static_cast<unsigned int>(std::ceil(scene_limit.height() / cell_size));
  width[2] =
      static_cast<unsigned int>(std::ceil(scene_limit.depth() / cell_size));
}
 
//==============================================================================
std::vector<unsigned int> SpatialHash::operator()(const AABB& aabb) const {
  unsigned int min_x = static_cast<unsigned int>(
      std::floor((aabb.min_[0] - scene_limit.min_[0]) / cell_size));
  unsigned int max_x = static_cast<unsigned int>(
      std::ceil((aabb.max_[0] - scene_limit.min_[0]) / cell_size));
  unsigned int min_y = static_cast<unsigned int>(
      std::floor((aabb.min_[1] - scene_limit.min_[1]) / cell_size));
  unsigned int max_y = static_cast<unsigned int>(
      std::ceil((aabb.max_[1] - scene_limit.min_[1]) / cell_size));
  unsigned int min_z = static_cast<unsigned int>(
      std::floor((aabb.min_[2] - scene_limit.min_[2]) / cell_size));
  unsigned int max_z = static_cast<unsigned int>(
      std::ceil((aabb.max_[2] - scene_limit.min_[2]) / cell_size));
 
  std::vector<unsigned int> keys(
      static_cast<size_t>((max_x - min_x) * (max_y - min_y) * (max_z - min_z)));
  size_t id = 0;
  for (unsigned int x = min_x; x < max_x; ++x) {
    for (unsigned int y = min_y; y < max_y; ++y) {
      for (unsigned int z = min_z; z < max_z; ++z) {
        keys[id++] = x + y * width[0] + z * width[0] * width[1];
      }
    }
  }
  return keys;
}
 
}  // namespace detail
}  // namespace coal
 
#endif