Abstract BVH builder based on the concept of work queue. Queue based BVH builders support parallelization with a fixed number of threads (maximum efficiency is achieved by setting the number of threads equal to the number of CPU cores plus one). Note that to support parallel mode, a corresponding BVH primitive set should provide thread safe implementations of interface functions (e.g., Swap, Box, Center). Otherwise, the results will be undefined. More...

#include <BVH_QueueBuilder.hxx>

Inheritance diagram for BVH_QueueBuilder< T, N >:

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Data Structures
struct	BVH_ChildNodes
	Stores parameters of constructed child nodes. More...

struct	BVH_PrimitiveRange
	Stores range of primitives belonging to a BVH node. More...

class	BVH_TypedBuildTool
	Wrapper for BVH build data. More...

Public Member Functions
	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 ()=0
	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_Transient &	operator= (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_Transient *	This () 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 =0
	Performs splitting of the given BVH node. More...

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...

Protected Attributes
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...

Additional Inherited Members
Public Types inherited from Standard_Transient
typedef void	base_type
	Returns a type descriptor about this object. More...

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...

Detailed Description

template<class T, int N>
class BVH_QueueBuilder< T, N >

Abstract BVH builder based on the concept of work queue. Queue based BVH builders support parallelization with a fixed number of threads (maximum efficiency is achieved by setting the number of threads equal to the number of CPU cores plus one). Note that to support parallel mode, a corresponding BVH primitive set should provide thread safe implementations of interface functions (e.g., Swap, Box, Center). Otherwise, the results will be undefined.

Template Parameters

T	Numeric data type
N	Vector dimension

Constructor & Destructor Documentation