Open CASCADE Technology  7.6.0.dev
Data Structures | Public Types | Public Member Functions | Protected Member Functions
BVH_BinnedBuilder< T, N, Bins > Class Template Reference

Performs construction of BVH tree using binned SAH algorithm. Number of bins controls BVH quality in cost of construction time (greater - better). For optimal results, use 32 - 48 bins. However, reasonable performance is provided even for 4 - 8 bins (it is only 10-20% lower in comparison with optimal settings). Note that multiple threads can be used only with thread safe BVH primitive sets. More...

#include <BVH_BinnedBuilder.hxx>

Inheritance diagram for BVH_BinnedBuilder< T, N, Bins >:
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Data Structures

struct  BVH_SplitPlane
 Describes split plane candidate. More...
 

Public Types

typedef BVH_Bin< T, N > BVH_BinVector[Bins]
 Type of the array of bins of BVH tree node. More...
 
typedef BVH_SplitPlane BVH_SplitPlanes[Bins+1]
 Type of the array of split plane candidates. More...
 
- Public Types inherited from Standard_Transient
typedef void base_type
 Returns a type descriptor about this object. More...
 

Public Member Functions

 BVH_BinnedBuilder (const Standard_Integer theLeafNodeSize=BVH_Constants_LeafNodeSizeDefault, const Standard_Integer theMaxTreeDepth=BVH_Constants_MaxTreeDepth, const Standard_Boolean theDoMainSplits=Standard_False, const Standard_Integer theNumOfThreads=1)
 Creates binned SAH BVH builder. More...
 
virtual ~BVH_BinnedBuilder ()
 Releases resources of binned SAH BVH builder. More...
 
- Public Member Functions inherited from BVH_QueueBuilder< T, N >
 BVH_QueueBuilder (const Standard_Integer theLeafNodeSize, const Standard_Integer theMaxTreeDepth, const Standard_Integer theNumOfThreads=1)
 Creates new BVH queue based builder. More...
 
virtual ~BVH_QueueBuilder ()
 Releases resources of BVH queue based builder. More...
 
virtual void Build (BVH_Set< T, N > *theSet, BVH_Tree< T, N > *theBVH, const BVH_Box< T, N > &theBox) const override
 Builds BVH using specific algorithm. More...
 
- Public Member Functions inherited from BVH_BuilderTransient
Standard_Integer MaxTreeDepth () const
 Returns the maximum depth of constructed BVH. More...
 
Standard_Integer LeafNodeSize () const
 Returns the maximum number of sub-elements in the leaf. More...
 
Standard_Boolean IsParallel () const
 Returns parallel flag. More...
 
void SetParallel (const Standard_Boolean isParallel)
 Set parallel flag contolling possibility of parallel execution. More...
 
- Public Member Functions inherited from Standard_Transient
 Standard_Transient ()
 Empty constructor. More...
 
 Standard_Transient (const Standard_Transient &)
 Copy constructor – does nothing. More...
 
Standard_Transientoperator= (const Standard_Transient &)
 Assignment operator, needed to avoid copying reference counter. More...
 
virtual ~Standard_Transient ()
 Destructor must be virtual. More...
 
virtual void Delete () const
 Memory deallocator for transient classes. More...
 
virtual const opencascade::handle< Standard_Type > & DynamicType () const
 Returns a type descriptor about this object. More...
 
Standard_Boolean IsInstance (const opencascade::handle< Standard_Type > &theType) const
 Returns a true value if this is an instance of Type. More...
 
Standard_Boolean IsInstance (const Standard_CString theTypeName) const
 Returns a true value if this is an instance of TypeName. More...
 
Standard_Boolean IsKind (const opencascade::handle< Standard_Type > &theType) const
 Returns true if this is an instance of Type or an instance of any class that inherits from Type. Note that multiple inheritance is not supported by OCCT RTTI mechanism. More...
 
Standard_Boolean IsKind (const Standard_CString theTypeName) const
 Returns true if this is an instance of TypeName or an instance of any class that inherits from TypeName. Note that multiple inheritance is not supported by OCCT RTTI mechanism. More...
 
Standard_TransientThis () const
 Returns non-const pointer to this object (like const_cast). For protection against creating handle to objects allocated in stack or call from constructor, it will raise exception Standard_ProgramError if reference counter is zero. More...
 
Standard_Integer GetRefCount () const
 Get the reference counter of this object. More...
 
void IncrementRefCounter () const
 Increments the reference counter of this object. More...
 
Standard_Integer DecrementRefCounter () const
 Decrements the reference counter of this object; returns the decremented value. More...
 

Protected Member Functions

virtual BVH_QueueBuilder< T, N >::BVH_ChildNodes buildNode (BVH_Set< T, N > *theSet, BVH_Tree< T, N > *theBVH, const Standard_Integer theNode) const override
 Performs splitting of the given BVH node. More...
 
virtual void getSubVolumes (BVH_Set< T, N > *theSet, BVH_Tree< T, N > *theBVH, const Standard_Integer theNode, BVH_BinVector &theBins, const Standard_Integer theAxis) const
 Arranges node primitives into bins. More...
 
- Protected Member Functions inherited from BVH_QueueBuilder< T, N >
virtual void addChildren (BVH_Tree< T, N > *theBVH, BVH_BuildQueue &theBuildQueue, const Standard_Integer theNode, const BVH_ChildNodes &theSubNodes) const
 Processes child nodes of the splitted BVH node. More...
 
- Protected Member Functions inherited from BVH_Builder< T, N >
 BVH_Builder (const Standard_Integer theLeafNodeSize, const Standard_Integer theMaxTreeDepth)
 Creates new abstract BVH builder. More...
 
void updateDepth (BVH_Tree< T, N > *theBVH, const Standard_Integer theLevel) const
 Updates depth of constructed BVH tree. More...
 
- Protected Member Functions inherited from BVH_BuilderTransient
 BVH_BuilderTransient (const Standard_Integer theLeafNodeSize, const Standard_Integer theMaxTreeDepth)
 Creates new abstract BVH builder. More...
 

Additional Inherited Members

- Static Public Member Functions inherited from Standard_Transient
static const char * get_type_name ()
 Returns a type descriptor about this object. More...
 
static const opencascade::handle< Standard_Type > & get_type_descriptor ()
 Returns type descriptor of Standard_Transient class. More...
 
- Protected Attributes inherited from BVH_QueueBuilder< T, N >
Standard_Integer myNumOfThreads
 Number of threads used to build BVH. More...
 
- Protected Attributes inherited from BVH_BuilderTransient
Standard_Integer myMaxTreeDepth
 Maximum depth of constructed BVH. More...
 
Standard_Integer myLeafNodeSize
 Maximum number of objects per leaf. More...
 
Standard_Boolean myIsParallel
 Parallel execution flag. More...
 

Detailed Description

template<class T, int N, int Bins = BVH_Constants_NbBinsOptimal>
class BVH_BinnedBuilder< T, N, Bins >

Performs construction of BVH tree using binned SAH algorithm. Number of bins controls BVH quality in cost of construction time (greater - better). For optimal results, use 32 - 48 bins. However, reasonable performance is provided even for 4 - 8 bins (it is only 10-20% lower in comparison with optimal settings). Note that multiple threads can be used only with thread safe BVH primitive sets.

Member Typedef Documentation

◆ BVH_BinVector

template<class T, int N, int Bins = BVH_Constants_NbBinsOptimal>
typedef BVH_Bin<T, N> BVH_BinnedBuilder< T, N, Bins >::BVH_BinVector[Bins]

Type of the array of bins of BVH tree node.

◆ BVH_SplitPlanes

template<class T, int N, int Bins = BVH_Constants_NbBinsOptimal>
typedef BVH_SplitPlane BVH_BinnedBuilder< T, N, Bins >::BVH_SplitPlanes[Bins+1]

Type of the array of split plane candidates.

Constructor & Destructor Documentation

◆ BVH_BinnedBuilder()

template<class T, int N, int Bins = BVH_Constants_NbBinsOptimal>
BVH_BinnedBuilder< T, N, Bins >::BVH_BinnedBuilder ( const Standard_Integer  theLeafNodeSize = BVH_Constants_LeafNodeSizeDefault,
const Standard_Integer  theMaxTreeDepth = BVH_Constants_MaxTreeDepth,
const Standard_Boolean  theDoMainSplits = Standard_False,
const Standard_Integer  theNumOfThreads = 1 
)
inline

Creates binned SAH BVH builder.

◆ ~BVH_BinnedBuilder()

template<class T, int N, int Bins = BVH_Constants_NbBinsOptimal>
virtual BVH_BinnedBuilder< T, N, Bins >::~BVH_BinnedBuilder ( )
inlinevirtual

Releases resources of binned SAH BVH builder.

Member Function Documentation

◆ buildNode()

template<class T, int N, int Bins>
BVH_QueueBuilder< T, N >::BVH_ChildNodes BVH_BinnedBuilder< T, N, Bins >::buildNode ( BVH_Set< T, N > *  theSet,
BVH_Tree< T, N > *  theBVH,
const Standard_Integer  theNode 
) const
overrideprotectedvirtual

Performs splitting of the given BVH node.

Implements BVH_QueueBuilder< T, N >.

◆ getSubVolumes()

template<class T, int N, int Bins>
void BVH_BinnedBuilder< T, N, Bins >::getSubVolumes ( BVH_Set< T, N > *  theSet,
BVH_Tree< T, N > *  theBVH,
const Standard_Integer  theNode,
BVH_BinVector theBins,
const Standard_Integer  theAxis 
) const
protectedvirtual

Arranges node primitives into bins.


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