Mesh Oriented datABase  (version 5.5.1)
An array-based unstructured mesh library
Public Types | Public Member Functions | Private Types | Private Member Functions | Private Attributes | List of all members
moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer > Class Template Reference

#include <bvh_tree.hpp>

+ Collaboration diagram for moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >:

Public Types

typedef _Entity_handles Entity_handles
 
typedef _Box Box
 
typedef _Moab Moab
 
typedef _Parametrizer Parametrizer
 
typedef Entity_handles::value_type Entity_handle
 

Public Member Functions

 Bvh_tree (Entity_handles &_entities, Moab &_moab, Box &_bounding_box, Parametrizer &_entity_contains)
 
 Bvh_tree (Self &s)
 
template<typename Box >
std::size_t bucket_index (const Box &box, const Box &interval, const std::size_t dim) const
 
template<typename Iterator , typename Bounding_box , typename Buckets >
void establish_buckets (const Iterator begin, const Iterator end, const Bounding_box &interval, Buckets &buckets) const
 
template<typename Box , typename Iterator >
std::size_t set_interval (Box &interval, const Iterator begin, const Iterator end) const
 
template<typename Splits , typename Buckets , typename Split_data >
void initialize_splits (Splits &splits, const Buckets &buckets, const Split_data &data) const
 
template<typename Iterator , typename Split_data >
void order_elements (const Iterator &begin, const Iterator &end, const Split_data &data) const
 
template<typename Iterator , typename Split_data >
void median_order (const Iterator &begin, const Iterator &end, Split_data &data) const
 
template<typename Splits , typename Split_data >
void choose_best_split (const Splits &splits, Split_data &data) const
 
template<typename Iterator , typename Split_data >
void find_split (const Iterator &begin, const Iterator &end, Split_data &data) const
 
template<typename Vector , typename Result >
Result & find (const Vector &point, const double tol, Result &result) const
 
template<typename Vector >
Entity_handle bruteforce_find (const Vector &point, const double tol) const
 

Private Types

typedef Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer > Self
 
typedef std::pair< Box, Entity_handle > Leaf_element
 
typedef _bvh::_Node< Box, Entity_handle > Node
 
typedef std::vector< Node > Nodes
 

Private Member Functions

template<typename Iterator >
int build_tree (const Iterator begin, const Iterator end, const int index, const Box &box, const int depth=0)
 
template<typename Vector , typename Node_index , typename Result >
Result & _find_point (const Vector &point, const Node_index &index, const double tol, Result &result) const
 

Private Attributes

const Entity_handles & entity_handles_
 
Nodes tree_
 
Moab & moab
 
Box bounding_box
 
Parametrizer & entity_contains
 

Detailed Description

template<typename _Entity_handles, typename _Box, typename _Moab, typename _Parametrizer>
class moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >

Definition at line 152 of file bvh_tree.hpp.

Member Typedef Documentation

◆ Box

template<typename _Entity_handles , typename _Box , typename _Moab , typename _Parametrizer >
typedef _Box moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::Box

Definition at line 157 of file bvh_tree.hpp.

◆ Entity_handle

template<typename _Entity_handles , typename _Box , typename _Moab , typename _Parametrizer >
typedef Entity_handles::value_type moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::Entity_handle

Definition at line 160 of file bvh_tree.hpp.

◆ Entity_handles

template<typename _Entity_handles , typename _Box , typename _Moab , typename _Parametrizer >
typedef _Entity_handles moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::Entity_handles

Definition at line 156 of file bvh_tree.hpp.

◆ Leaf_element

template<typename _Entity_handles , typename _Box , typename _Moab , typename _Parametrizer >
typedef std::pair< Box, Entity_handle > moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::Leaf_element
private

Definition at line 165 of file bvh_tree.hpp.

◆ Moab

template<typename _Entity_handles , typename _Box , typename _Moab , typename _Parametrizer >
typedef _Moab moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::Moab

Definition at line 158 of file bvh_tree.hpp.

◆ Node

template<typename _Entity_handles , typename _Box , typename _Moab , typename _Parametrizer >
typedef _bvh::_Node< Box, Entity_handle > moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::Node
private

Definition at line 166 of file bvh_tree.hpp.

◆ Nodes

template<typename _Entity_handles , typename _Box , typename _Moab , typename _Parametrizer >
typedef std::vector< Node > moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::Nodes
private

Definition at line 167 of file bvh_tree.hpp.

◆ Parametrizer

template<typename _Entity_handles , typename _Box , typename _Moab , typename _Parametrizer >
typedef _Parametrizer moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::Parametrizer

Definition at line 159 of file bvh_tree.hpp.

◆ Self

template<typename _Entity_handles , typename _Box , typename _Moab , typename _Parametrizer >
typedef Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer > moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::Self
private

Definition at line 164 of file bvh_tree.hpp.

Constructor & Destructor Documentation

◆ Bvh_tree() [1/2]

template<typename _Entity_handles , typename _Box , typename _Moab , typename _Parametrizer >
moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::Bvh_tree ( Entity_handles &  _entities,
Moab &  _moab,
Box &  _bounding_box,
Parametrizer &  _entity_contains 
)
inline

Definition at line 171 of file bvh_tree.hpp.

172  : entity_handles_( _entities ), tree_(), moab( _moab ), bounding_box( _bounding_box ),
173  entity_contains( _entity_contains )
174  {
175  typedef typename Entity_handles::iterator Entity_handle_iterator;
176  typedef ct::_Element_data< const _Box, double > Element_data;
177  typedef typename std::tr1::unordered_map< Entity_handle, Element_data > Entity_map;
178  typedef typename Entity_map::iterator Entity_map_iterator;
179  typedef std::vector< Entity_map_iterator > Vector;
180  // a fully balanced tree will have 2*_entities.size()
181  // which is one doubling away..
182  tree_.reserve( entity_handles_.size() );
183  Entity_map entity_map( entity_handles_.size() );
184  ct::construct_element_map( entity_handles_, entity_map, bounding_box, moab );
185 #ifdef BVH_TREE_DEBUG
186  for( Entity_map_iterator i = entity_map.begin(); i != entity_map.end(); ++i )
187  {
188  if( !box_contains_box( bounding_box, i->second.first, 0 ) )
189  {
190  std::cerr << "BB:" << bounding_box << "EB:" << i->second.first << std::endl;
191  std::exit( -1 );
192  }
193  }
194 #endif
195  //_bounding_box = bounding_box;
196  Vector entity_ordering;
197  construct_ordering( entity_map, entity_ordering );
198  // We only build nonempty trees
199  if( entity_ordering.size() )
200  {
201  // initially all bits are set
202  tree_.push_back( Node() );
203  const int depth = build_tree( entity_ordering.begin(), entity_ordering.end(), 0, bounding_box );
204 #ifdef BVH_TREE_DEBUG
205  typedef typename Nodes::iterator Node_iterator;
206  typedef typename Node::Entities::iterator Entity_iterator;
207  std::set< Entity_handle > entity_handles;
208  for( Node_iterator i = tree_.begin(); i != tree_.end(); ++i )
209  {
210  for( Entity_iterator j = i->entities.begin(); j != i->entities.end(); ++j )
211  {
212  entity_handles.insert( j->second );
213  }
214  }
215  if( entity_handles.size() != entity_handles_.size() )
216  {
217  std::cout << "Entity Handle Size Mismatch!" << std::endl;
218  }
219  typedef typename Entity_handles::iterator Entity_iterator_;
220  for( Entity_iterator_ i = entity_handles_.begin(); i != entity_handles_.end(); ++i )
221  {
222  if( entity_handles.find( *i ) == entity_handles.end() )
223  {
224  std::cout << "Tree is missing an entity! " << std::endl;
225  }
226  }
227 
228 #endif
229  std::cout << "max tree depth: " << depth << std::endl;
230  }
231  }

References moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::bounding_box, moab::common_tree::box_contains_box(), moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::build_tree(), moab::common_tree::construct_element_map(), moab::common_tree::construct_ordering(), moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::entity_handles_, and moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::tree_.

◆ Bvh_tree() [2/2]

template<typename _Entity_handles , typename _Box , typename _Moab , typename _Parametrizer >
moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::Bvh_tree ( Self &  s)
inline

Definition at line 234 of file bvh_tree.hpp.

235  : entity_handles_( s.entity_handles_ ), tree_( s.tree_ ), moab( s.moab ), bounding_box( s.bounding_box ),
236  entity_contains( s.entity_contains )
237  {
238  }

Member Function Documentation

◆ _find_point()

template<typename _Entity_handles , typename _Box , typename _Moab , typename _Parametrizer >
template<typename Vector , typename Node_index , typename Result >
Result& moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::_find_point ( const Vector &  point,
const Node_index &  index,
const double  tol,
Result &  result 
) const
inlineprivate

Definition at line 679 of file bvh_tree.hpp.

680  {
681  typedef typename Node::Entities::const_iterator Entity_iterator;
682  const Node& node = tree_[index];
683  if( node.dim == 3 )
684  {
685  for( Entity_iterator i = node.entities.begin(); i != node.entities.end(); ++i )
686  {
687  if( ct::box_contains_point( i->first, point, tol ) )
688  {
689  const std::pair< bool, Vector > r = entity_contains( moab, i->second, point );
690  if( r.first )
691  {
692  return result = std::make_pair( i->second, r.second );
693  }
694  }
695  }
696  result = Result( 0, point );
697  return result;
698  }
699  // the extra tol here considers the case where
700  // 0 < Rmin - Lmax < 2tol
701  if( ( node.Lmax + tol ) < ( node.Rmin - tol ) )
702  {
703  if( point[node.dim] <= ( node.Lmax + tol ) )
704  {
705  return _find_point( point, node.child, tol, result );
706  }
707  else if( point[node.dim] >= ( node.Rmin - tol ) )
708  {
709  return _find_point( point, node.child + 1, tol, result );
710  }
711  result = Result( 0, point );
712  return result; // point lies in empty space.
713  }
714  // Boxes overlap
715  // left of Rmin, you must be on the left
716  // we can't be sure about the boundaries since the boxes overlap
717  // this was a typo in the paper which caused pain.
718  if( point[node.dim] < ( node.Rmin - tol ) )
719  {
720  return _find_point( point, node.child, tol, result );
721  // if you are on the right Lmax, you must be on the right
722  }
723  else if( point[node.dim] > ( node.Lmax + tol ) )
724  {
725  return _find_point( point, node.child + 1, tol, result );
726  }
727  /* pg5 of paper
728  * However, instead of always traversing either subtree
729  * first (e.g. left always before right), we first traverse
730  * the subtree whose bounding plane has the larger distance to the
731  * sought point. This results in less overall traversal, and the correct
732  * cell is identified more quickly.
733  */
734  // Sofar all testing confirms that this 'heuristic' is
735  // significantly slower.
736  // I conjecture this is because it gets improperly
737  // branch predicted..
738  // bool dir = (point[ node.dim] - node.Rmin) <=
739  // (node.Lmax - point[ node.dim]);
740  bool dir = false;
741  _find_point( point, node.child + dir, tol, result );
742  if( result.first == 0 )
743  {
744  return _find_point( point, node.child + ( !dir ), tol, result );
745  }
746  return result;
747  }

References moab::common_tree::box_contains_point(), moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::entity_contains, and moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::tree_.

Referenced by moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::find().

◆ bruteforce_find()

template<typename _Entity_handles , typename _Box , typename _Moab , typename _Parametrizer >
template<typename Vector >
Entity_handle moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::bruteforce_find ( const Vector &  point,
const double  tol 
) const
inline

Definition at line 761 of file bvh_tree.hpp.

762  {
763  typedef typename Vector::const_iterator Point_iterator;
764  typedef typename Nodes::value_type Node;
765  typedef typename Nodes::const_iterator Node_iterator;
766  typedef typename Node::Entities::const_iterator Entity_iterator;
767  for( Node_iterator i = tree_.begin(); i != tree_.end(); ++i )
768  {
769  if( i->dim == 3 )
770  {
771  for( Entity_iterator j = i->entities.begin(); j != i->entities.end(); ++j )
772  {
773  if( ct::box_contains_point( j->first, point, tol ) )
774  {
775  const std::pair< bool, Vector > result = entity_contains( moab, j->second, point );
776  if( result.first )
777  {
778  return j->second;
779  }
780  }
781  }
782  }
783  }
784  return 0;
785  }

References moab::common_tree::box_contains_point(), moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::entity_contains, and moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::tree_.

◆ bucket_index()

template<typename _Entity_handles , typename _Box , typename _Moab , typename _Parametrizer >
template<typename Box >
std::size_t moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::bucket_index ( const Box &  box,
const Box &  interval,
const std::size_t  dim 
) const
inline

Definition at line 247 of file bvh_tree.hpp.

248  {
249  const double min = interval.min[dim];
250  const double length = ( interval.max[dim] - min ) / NUM_BUCKETS;
251  const double center = ( ( box.max[dim] + box.min[dim] ) / 2.0 ) - min;
252 #ifdef BVH_TREE_DEBUG
253 #ifdef BVH_SHOW_INDEX
254  std::cout << "[ " << min << " , " << interval.max[dim] << " ]" << std::endl;
255  std::cout << "[ " << box.min[dim] << " , " << box.max[dim] << " ]" << std::endl;
256  std::cout << "Length of bucket" << length << std::endl;
257  std::cout << "Center: " << ( box.max[dim] + box.min[dim] ) / 2.0 << std::endl;
258  std::cout << "Distance of center from min: " << center << std::endl;
259  std::cout << "ratio: " << center / length << std::endl;
260  std::cout << "index: " << std::ceil( center / length ) - 1 << std::endl;
261 #endif
262 #endif
263  return std::ceil( center / length ) - 1;
264  }

References center(), dim, length(), and NUM_BUCKETS.

Referenced by moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::establish_buckets(), and moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::order_elements().

◆ build_tree()

template<typename _Entity_handles , typename _Box , typename _Moab , typename _Parametrizer >
template<typename Iterator >
int moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::build_tree ( const Iterator  begin,
const Iterator  end,
const int  index,
const Box &  box,
const int  depth = 0 
)
inlineprivate

Definition at line 639 of file bvh_tree.hpp.

640  {
641 #ifdef BVH_TREE_DEBUG
642  for( Iterator i = begin; i != end; ++i )
643  {
644  if( !box_contains_box( box, ( *i )->second.first, 0 ) )
645  {
646  std::cerr << "depth: " << depth << std::endl;
647  std::cerr << "BB:" << box << "EB:" << ( *i )->second.first << std::endl;
648  std::exit( -1 );
649  }
650  }
651 #endif
652 
653  const std::size_t total_num_elements = std::distance( begin, end );
654  Node& node = tree_[index];
655  // logic for splitting conditions
656  if( total_num_elements > SMAX )
657  {
658  _bvh::_Split_data data;
659  data.bounding_box = box;
660  find_split( begin, end, data );
661  // assign data to node
662  node.Lmax = data.Lmax;
663  node.Rmin = data.Rmin;
664  node.dim = data.dim;
665  node.child = tree_.size();
666  // insert left, right children;
667  tree_.push_back( Node() );
668  tree_.push_back( Node() );
669  const int left_depth = build_tree( begin, begin + data.nl, node.child, data.left_box, depth + 1 );
670  const int right_depth = build_tree( begin + data.nl, end, node.child + 1, data.right_box, depth + 1 );
671  return std::max( left_depth, right_depth );
672  }
673  node.dim = 3;
674  ct::assign_entities( node.entities, begin, end );
675  return depth;
676  }

References moab::common_tree::assign_entities(), moab::common_tree::box_contains_box(), moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::find_split(), SMAX, and moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::tree_.

Referenced by moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::Bvh_tree().

◆ choose_best_split()

template<typename _Entity_handles , typename _Box , typename _Moab , typename _Parametrizer >
template<typename Splits , typename Split_data >
void moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::choose_best_split ( const Splits &  splits,
Split_data &  data 
) const
inline

Definition at line 498 of file bvh_tree.hpp.

499  {
500  typedef typename Splits::const_iterator List_iterator;
501  typedef typename List_iterator::value_type::const_iterator Split_iterator;
502  typedef typename Split_iterator::value_type Split;
503  std::vector< Split > best_splits;
504  typedef typename _bvh::Split_comparator< Split > Comparator;
505  Comparator compare;
506  for( List_iterator i = splits.begin(); i != splits.end(); ++i )
507  {
508  Split_iterator j = std::min_element( i->begin(), i->end(), compare );
509  best_splits.push_back( *j );
510  }
511  data = *std::min_element( best_splits.begin(), best_splits.end(), compare );
512  }

Referenced by moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::find_split().

◆ establish_buckets()

template<typename _Entity_handles , typename _Box , typename _Moab , typename _Parametrizer >
template<typename Iterator , typename Bounding_box , typename Buckets >
void moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::establish_buckets ( const Iterator  begin,
const Iterator  end,
const Bounding_box &  interval,
Buckets &  buckets 
) const
inline

Definition at line 267 of file bvh_tree.hpp.

271  {
272  // put each element into its bucket
273  for( Iterator i = begin; i != end; ++i )
274  {
275  const Bounding_box& box = ( *i )->second.first;
276  for( std::size_t dim = 0; dim < NUM_DIM; ++dim )
277  {
278  const std::size_t index = bucket_index( box, interval, dim );
279  _bvh::_Bucket& bucket = buckets[dim][index];
280  if( bucket.size > 0 )
281  {
282  ct::update_bounding_box( bucket.bounding_box, box );
283  }
284  else
285  {
286  bucket.bounding_box = box;
287  }
288  bucket.size++;
289  }
290  }
291 #ifdef BVH_TREE_DEBUG
292  Bounding_box elt_union = ( *begin )->second.first;
293  for( Iterator i = begin; i != end; ++i )
294  {
295  const Bounding_box& box = ( *i )->second.first;
296  ct::update_bounding_box( elt_union, box );
297  for( std::size_t dim = 0; dim < NUM_DIM; ++dim )
298  {
299  const std::size_t index = bucket_index( box, interval, dim );
300  _bvh::_Bucket& bucket = buckets[dim][index];
301  if( !box_contains_box( bucket.bounding_box, box ) )
302  {
303  std::cerr << "Buckets not covering elements!" << std::endl;
304  }
305  }
306  }
307  if( !box_contains_box( elt_union, interval ) )
308  {
309  std::cout << "element union: " << std::endl << elt_union;
310  std::cout << "intervals: " << std::endl << interval;
311  std::cout << "union of elts does not contain original box!" << std::endl;
312  }
313  if( !box_contains_box( interval, elt_union ) )
314  {
315  std::cout << "original box does not contain union of elts" << std::endl;
316  std::cout << interval << std::endl;
317  std::cout << elt_union << std::endl;
318  }
319  typedef typename Buckets::value_type Bucket_list;
320  typedef typename Bucket_list::const_iterator Bucket_iterator;
321  for( std::size_t d = 0; d < NUM_DIM; ++d )
322  {
323  std::vector< std::size_t > nonempty;
324  const Bucket_list& buckets_ = buckets[d];
325  std::size_t j = 0;
326  for( Bucket_iterator i = buckets_.begin(); i != buckets_.end(); ++i, ++j )
327  {
328  if( i->size > 0 )
329  {
330  nonempty.push_back( j );
331  }
332  }
333  Bounding_box test_box = buckets_[nonempty.front()].bounding_box;
334  for( std::size_t i = 0; i < nonempty.size(); ++i )
335  {
336  ct::update_bounding_box( test_box, buckets_[nonempty[i]].bounding_box );
337  }
338  if( !box_contains_box( test_box, interval ) )
339  {
340  std::cout << "union of buckets in dimension: " << d << "does not contain original box!" << std::endl;
341  }
342  if( !box_contains_box( interval, test_box ) )
343  {
344  std::cout << "original box does "
345  << "not contain union of buckets"
346  << "in dimension: " << d << std::endl;
347  std::cout << interval << std::endl;
348  std::cout << test_box << std::endl;
349  }
350  }
351 #endif
352  }

References moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::bounding_box, moab::common_tree::box_contains_box(), moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::bucket_index(), dim, NUM_DIM, and moab::common_tree::update_bounding_box().

Referenced by moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::find_split().

◆ find()

template<typename _Entity_handles , typename _Box , typename _Moab , typename _Parametrizer >
template<typename Vector , typename Result >
Result& moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::find ( const Vector &  point,
const double  tol,
Result &  result 
) const
inline

Definition at line 752 of file bvh_tree.hpp.

753  {
754  typedef typename Vector::const_iterator Point_iterator;
755  return _find_point( point, 0, tol, result );
756  }

References moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::_find_point().

◆ find_split()

template<typename _Entity_handles , typename _Box , typename _Moab , typename _Parametrizer >
template<typename Iterator , typename Split_data >
void moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::find_split ( const Iterator &  begin,
const Iterator &  end,
Split_data &  data 
) const
inline

Definition at line 515 of file bvh_tree.hpp.

516  {
517  typedef typename Iterator::value_type Map_iterator;
518  typedef typename Map_iterator::value_type::second_type Box_data;
519  typedef typename Box_data::first_type _Bounding_box; // Note, not global typedef moab::common_tree::Box<
520  // double> Bounding_box;
521  typedef typename std::vector< Split_data > Split_list;
522  typedef typename std::vector< Split_list > Splits;
523  typedef typename Splits::iterator Split_iterator;
524  typedef typename std::vector< _bvh::_Bucket > Bucket_list;
525  typedef typename std::vector< Bucket_list > Buckets;
526  Buckets buckets( NUM_DIM, Bucket_list( NUM_BUCKETS ) );
527  Splits splits( NUM_DIM, Split_list( NUM_SPLITS, data ) );
528 
529  const _Bounding_box interval = data.bounding_box;
530  establish_buckets( begin, end, interval, buckets );
531  initialize_splits( splits, buckets, data );
532  choose_best_split( splits, data );
533  const bool use_median = ( 0 == data.nl ) || ( data.nr == 0 );
534  if( !use_median )
535  {
536  order_elements( begin, end, data );
537  }
538  else
539  {
540  median_order( begin, end, data );
541  }
542 #ifdef BVH_TREE_DEBUG
543  bool seen_one = false, issue = false;
544  bool first_left = true, first_right = true;
545  std::size_t count_left = 0, count_right = 0;
546  typename Split_data::Box left_box, right_box;
547  for( Iterator i = begin; i != end; ++i )
548  {
549  double order = ( *i )->second.second;
550  if( order != 0 && order != 1 )
551  {
552  std::cerr << "Invalid order element !";
553  std::cerr << order << std::endl;
554  std::exit( -1 );
555  }
556  if( order == 1 )
557  {
558  seen_one = 1;
559  count_right++;
560  if( first_right )
561  {
562  right_box = ( *i )->second.first;
563  first_right = false;
564  }
565  else
566  {
567  ct::update_bounding_box( right_box, ( *i )->second.first );
568  }
569  if( !box_contains_box( data.right_box, ( *i )->second.first ) )
570  {
571  if( !issue )
572  {
573  std::cerr << "Bounding right box issue!" << std::endl;
574  }
575  issue = true;
576  }
577  }
578  if( order == 0 )
579  {
580  count_left++;
581  if( first_left )
582  {
583  left_box = ( *i )->second.first;
584  first_left = false;
585  }
586  else
587  {
588  ct::update_bounding_box( left_box, ( *i )->second.first );
589  }
590  if( !box_contains_box( data.left_box, ( *i )->second.first ) )
591  {
592  if( !issue )
593  {
594  std::cerr << "Bounding left box issue!" << std::endl;
595  }
596  issue = true;
597  }
598  if( seen_one )
599  {
600  std::cerr << "Invalid ordering!" << std::endl;
601  std::cout << ( *( i - 1 ) )->second.second << order << std::endl;
602  exit( -1 );
603  }
604  }
605  }
606  if( !box_contains_box( left_box, data.left_box ) )
607  {
608  std::cout << "left elts do not contain left box" << std::endl;
609  }
610  if( !box_contains_box( data.left_box, left_box ) )
611  {
612  std::cout << "left box does not contain left elts" << std::endl;
613  }
614  if( !box_contains_box( right_box, data.right_box ) )
615  {
616  std::cout << "right elts do not contain right box" << std::endl;
617  }
618  if( !box_contains_box( data.right_box, right_box ) )
619  {
620  std::cout << "right box do not contain right elts" << std::endl;
621  }
622  if( count_left != data.nl || count_right != data.nr )
623  {
624  std::cerr << "counts are off!" << std::endl;
625  std::cerr << "total: " << std::distance( begin, end ) << std::endl;
626  std::cerr << "Dim: " << data.dim << std::endl;
627  std::cerr << data.Lmax << " , " << data.Rmin << std::endl;
628  std::cerr << "Right box: " << std::endl << data.right_box << "Left box: " << std::endl << data.left_box;
629  std::cerr << "supposed to be: " << data.nl << " " << data.nr << std::endl;
630  std::cerr << "accountant says: " << count_left << " " << count_right << std::endl;
631  std::exit( -1 );
632  }
633 #endif
634  }

References moab::common_tree::box_contains_box(), moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::choose_best_split(), moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::establish_buckets(), moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::initialize_splits(), left_box, moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::median_order(), NUM_BUCKETS, NUM_DIM, NUM_SPLITS, moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::order_elements(), right_box, and moab::common_tree::update_bounding_box().

Referenced by moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::build_tree().

◆ initialize_splits()

template<typename _Entity_handles , typename _Box , typename _Moab , typename _Parametrizer >
template<typename Splits , typename Buckets , typename Split_data >
void moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::initialize_splits ( Splits &  splits,
const Buckets &  buckets,
const Split_data &  data 
) const
inline

Definition at line 380 of file bvh_tree.hpp.

381  {
382  typedef typename Buckets::value_type Bucket_list;
383  typedef typename Bucket_list::value_type Bucket;
384  typedef typename Bucket_list::const_iterator Bucket_iterator;
385  typedef typename Splits::value_type Split_list;
386  typedef typename Split_list::value_type Split;
387  typedef typename Split_list::iterator Split_iterator;
388  for( std::size_t d = 0; d < NUM_DIM; ++d )
389  {
390  const Split_iterator splits_begin = splits[d].begin();
391  const Split_iterator splits_end = splits[d].end();
392  const Bucket_iterator left_begin = buckets[d].begin();
393  const Bucket_iterator _end = buckets[d].end();
394  Bucket_iterator left_end = buckets[d].begin() + 1;
395  for( Split_iterator s = splits_begin; s != splits_end; ++s, ++left_end )
396  {
397  s->nl = set_interval( s->left_box, left_begin, left_end );
398  if( s->nl == 0 )
399  {
400  s->left_box = data.bounding_box;
401  s->left_box.max[d] = s->left_box.min[d];
402  }
403  s->nr = set_interval( s->right_box, left_end, _end );
404  if( s->nr == 0 )
405  {
406  s->right_box = data.bounding_box;
407  s->right_box.min[d] = s->right_box.max[d];
408  }
409  s->Lmax = s->left_box.max[d];
410  s->Rmin = s->right_box.min[d];
411  s->split = std::distance( splits_begin, s );
412  s->dim = d;
413  }
414 #ifdef BVH_TREE_DEBUG
415  for( Split_iterator s = splits_begin; s != splits_end; ++s, ++left_end )
416  {
417  typename Split::Box test_box = s->left_box;
418  ct::update_bounding_box( test_box, s->right_box );
419  if( !box_contains_box( data.bounding_box, test_box ) )
420  {
421  std::cout << "nr: " << s->nr << std::endl;
422  std::cout << "Test box: " << std::endl << test_box;
423  std::cout << "Left box: " << std::endl << s->left_box;
424  std::cout << "Right box: " << std::endl << s->right_box;
425  std::cout << "Interval: " << std::endl << data.bounding_box;
426  std::cout << "Split boxes larger than bb" << std::endl;
427  }
428  if( !box_contains_box( test_box, data.bounding_box ) )
429  {
430  std::cout << "bb larger than union "
431  << "of split boxes" << std::endl;
432  }
433  }
434 #endif
435  }
436  }

References moab::common_tree::box_contains_box(), NUM_DIM, moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::set_interval(), and moab::common_tree::update_bounding_box().

Referenced by moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::find_split().

◆ median_order()

template<typename _Entity_handles , typename _Box , typename _Moab , typename _Parametrizer >
template<typename Iterator , typename Split_data >
void moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::median_order ( const Iterator &  begin,
const Iterator &  end,
Split_data &  data 
) const
inline

Definition at line 451 of file bvh_tree.hpp.

452  {
453  typedef typename Iterator::value_type Map_iterator;
454  for( Iterator i = begin; i != end; ++i )
455  {
456  const double center = compute_box_center( ( *i )->second.first, data.dim );
457  ( *i )->second.second = center;
458  }
459  std::sort( begin, end, _bvh::Iterator_comparator< Map_iterator >() );
460  const std::size_t total = std::distance( begin, end );
461  Iterator middle = begin + ( total / 2 );
462  double middle_center = ( *middle )->second.second;
463  middle_center += ( *( ++middle ) )->second.second;
464  middle_center /= 2.0;
465  data.split = middle_center;
466  data.nl = std::distance( begin, middle ) + 1;
467  data.nr = total - data.nl;
468  middle++;
469  data.left_box = ( *begin )->second.first;
470  data.right_box = ( *middle )->second.first;
471  for( Iterator i = begin; i != middle; ++i )
472  {
473  ( *i )->second.second = 0;
474  update_bounding_box( data.left_box, ( *i )->second.first );
475  }
476  for( Iterator i = middle; i != end; ++i )
477  {
478  ( *i )->second.second = 1;
479  update_bounding_box( data.right_box, ( *i )->second.first );
480  }
481  data.Rmin = data.right_box.min[data.dim];
482  data.Lmax = data.left_box.max[data.dim];
483 #ifdef BVH_TREE_DEBUG
484  typename Split_data::Box test_box = data.left_box;
485  ct::update_bounding_box( test_box, data.right_box );
486  if( !box_contains_box( data.bounding_box, test_box ) )
487  {
488  std::cerr << "MEDIAN: BB Does not contain splits" << std::endl;
489  }
490  if( !box_contains_box( test_box, data.bounding_box ) )
491  {
492  std::cerr << "MEDIAN: splits do not contain BB" << std::endl;
493  }
494 #endif
495  }

References moab::common_tree::box_contains_box(), center(), moab::common_tree::compute_box_center(), and moab::common_tree::update_bounding_box().

Referenced by moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::find_split().

◆ order_elements()

template<typename _Entity_handles , typename _Box , typename _Moab , typename _Parametrizer >
template<typename Iterator , typename Split_data >
void moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::order_elements ( const Iterator &  begin,
const Iterator &  end,
const Split_data &  data 
) const
inline

Definition at line 439 of file bvh_tree.hpp.

440  {
441  typedef typename Iterator::value_type Map_iterator;
442  for( Iterator i = begin; i != end; ++i )
443  {
444  const int index = bucket_index( ( *i )->second.first, data.bounding_box, data.dim );
445  ( *i )->second.second = ( index <= data.split ) ? 0 : 1;
446  }
447  std::sort( begin, end, _bvh::Iterator_comparator< Map_iterator >() );
448  }

References moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::bucket_index().

Referenced by moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::find_split().

◆ set_interval()

template<typename _Entity_handles , typename _Box , typename _Moab , typename _Parametrizer >
template<typename Box , typename Iterator >
std::size_t moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::set_interval ( Box &  interval,
const Iterator  begin,
const Iterator  end 
) const
inline

Definition at line 355 of file bvh_tree.hpp.

356  {
357  bool first = true;
358  std::size_t count = 0;
359  for( Iterator b = begin; b != end; ++b )
360  {
361  const Box& box = b->bounding_box;
362  count += b->size;
363  if( b->size != 0 )
364  {
365  if( first )
366  {
367  interval = box;
368  first = false;
369  }
370  else
371  {
372  ct::update_bounding_box( interval, box );
373  }
374  }
375  }
376  return count;
377  }

References moab::GeomUtil::first(), and moab::common_tree::update_bounding_box().

Referenced by moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::initialize_splits().

Member Data Documentation

◆ bounding_box

template<typename _Entity_handles , typename _Box , typename _Moab , typename _Parametrizer >
Box moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::bounding_box
private

Definition at line 794 of file bvh_tree.hpp.

Referenced by moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::Bvh_tree(), and moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::establish_buckets().

◆ entity_contains

template<typename _Entity_handles , typename _Box , typename _Moab , typename _Parametrizer >
Parametrizer& moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::entity_contains
private

Definition at line 795 of file bvh_tree.hpp.

Referenced by moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::_find_point(), and moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::bruteforce_find().

◆ entity_handles_

template<typename _Entity_handles , typename _Box , typename _Moab , typename _Parametrizer >
const Entity_handles& moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::entity_handles_
private

Definition at line 791 of file bvh_tree.hpp.

Referenced by moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::Bvh_tree().

◆ moab

template<typename _Entity_handles , typename _Box , typename _Moab , typename _Parametrizer >
Moab& moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::moab
private

Definition at line 793 of file bvh_tree.hpp.

◆ tree_

template<typename _Entity_handles , typename _Box , typename _Moab , typename _Parametrizer >
Nodes moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::tree_
private

Definition at line 792 of file bvh_tree.hpp.

Referenced by moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::_find_point(), moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::bruteforce_find(), moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::build_tree(), and moab::Bvh_tree< _Entity_handles, _Box, _Moab, _Parametrizer >::Bvh_tree().

The documentation for this class was generated from the following file: