U4DEngine::U4DVisibilityManager Class Reference

The U4DVisibilityManager class tests whether a model is within the camera frustum. More...

Public Member Functions
	U4DVisibilityManager ()
	class constructor
	~U4DVisibilityManager ()
	class destructor
void	buildBVH ()
	Method which starts building the BVH algorithm.
void	buildBVHNode (U4DBVHNode< U4DModel > *uNode, int uLeftIndex, int uSplitIndex)
	Method which builds a BVH tree node. More...
std::vector< U4DModel * >	getModelsContainer ()
	Method which returns all 3D entities in the BVH tree. More...
void	calculateBVHVolume (U4DBVHNode< U4DModel > *uNode)
	Method which computes a BVH node volume. More...
void	getBVHLongestDimensionVector (U4DBVHNode< U4DModel > *uNode)
	Method which computes the BVH node longest dimension vector. More...
void	getBVHSplitIndex (U4DBVHNode< U4DModel > *uNode)
	Method which computes a BVH node split index. More...
void	addModelToTreeContainer (U4DModel *uModel)
	Method which adds a model to the model container. More...
void	heapSorting (U4DBVHNode< U4DModel > *uNode)
	Method to heap sort the BVH tree nodes. More...
void	reHeapDown (U4DBVHNode< U4DModel > *uNode, int root, int bottom)
	Method used to heap-down sort the BVH tree nodes. More...
void	swap (U4DBVHNode< U4DModel > *uNode, int uindex1, int uindex2)
	Method used to swap the BVH tree node's array index. More...
void	startFrustumIntersection (std::vector< U4DPlane > &uPlanes)
	Starts the frustum vs model culling test. More...
void	clearContainers ()
	Method which clears all broad-phase collision containers.
void	setPauseBVHFBuild (bool uValue)
	method to inform that the bvh should be built. This method sets a flag but does not initiate construction of the bvh More...
bool	getPauseBVHBuild ()
	method that returns if the manager should build the BVH More...
void	startTimerForNextBVHBuild ()
	This methods starts the timer for the next bvh build. Note, it simply starts a timer. Once the time has elapsed, it sets the computeBVHFlag. It does not initiate the construction of the bvh.
void	bvhTimerIntervalElapsed ()
	Method that is called by the scheduler once the time interval has elapsed.
void	changeVisibilityInterval (float uValue)
	change the current visibility interval. The default is 0.5. More...

Detailed Description

The U4DVisibilityManager class tests whether a model is within the camera frustum.

Member Function Documentation

addModelToTreeContainer()

void U4DEngine::U4DVisibilityManager::addModelToTreeContainer

(

U4DModel *

uModel

)

Method which adds a model to the model container.

Parameters

uModel

3D model entity

buildBVHNode()

void U4DEngine::U4DVisibilityManager::buildBVHNode	(	U4DBVHNode< U4DModel > *	uNode,
		int	uLeftIndex,
		int	uSplitIndex
	)

Method which builds a BVH tree node.

Parameters

uNode	Tree node
uLeftIndex	Left index
uSplitIndex	Split index

calculateBVHVolume()

void U4DEngine::U4DVisibilityManager::calculateBVHVolume

(

U4DBVHNode< U4DModel > *

uNode

)

Method which computes a BVH node volume.

Parameters

uNode

BVH tree node

changeVisibilityInterval()

void U4DEngine::U4DVisibilityManager::changeVisibilityInterval

(

float

uValue

)

change the current visibility interval. The default is 0.5.

This interval determines how fast the BVH is computed to determine which 3D models are within the camera frustum. The lower this interval, the faster the BVH is computed.

Parameters

uValue

time interval.

getBVHLongestDimensionVector()

void U4DEngine::U4DVisibilityManager::getBVHLongestDimensionVector

(

U4DBVHNode< U4DModel > *

uNode

)

Method which computes the BVH node longest dimension vector.

Parameters

uNode

BVH tree node

getBVHSplitIndex()

void U4DEngine::U4DVisibilityManager::getBVHSplitIndex

(

U4DBVHNode< U4DModel > *

uNode

)

Method which computes a BVH node split index.

Parameters

uNode

BVH tree node

getModelsContainer()

std::vector< U4DModel * > U4DEngine::U4DVisibilityManager::getModelsContainer

(

)

Method which returns all 3D entities in the BVH tree.

Returns

Returns all 3D entities in the BVH tree

getPauseBVHBuild()

bool U4DEngine::U4DVisibilityManager::getPauseBVHBuild

(

)

method that returns if the manager should build the BVH

Returns

returns true if the manager should build the bvh. Note, it does not initiate initiate construcion of the bvh

heapSorting()

void U4DEngine::U4DVisibilityManager::heapSorting

(

U4DBVHNode< U4DModel > *

uNode

)

Method to heap sort the BVH tree nodes.

Parameters

uNode

BVH tree node

reHeapDown()

void U4DEngine::U4DVisibilityManager::reHeapDown	(	U4DBVHNode< U4DModel > *	uNode,
		int	root,
		int	bottom
	)

Method used to heap-down sort the BVH tree nodes.

Parameters

uNode	BVH tree node
root	Index of root node
bottom	bottom index

setPauseBVHFBuild()

void U4DEngine::U4DVisibilityManager::setPauseBVHFBuild

(

bool

uValue

)

method to inform that the bvh should be built. This method sets a flag but does not initiate construction of the bvh

Parameters

uValue

value to inform the manager to build the bvh

startFrustumIntersection()

void U4DEngine::U4DVisibilityManager::startFrustumIntersection

(

std::vector< U4DPlane > &

uPlanes

)

Starts the frustum vs model culling test.

Parameters

uPlanes

frustum planes

swap()

void U4DEngine::U4DVisibilityManager::swap	(	U4DBVHNode< U4DModel > *	uNode,
		int	uindex1,
		int	uindex2
	)

Method used to swap the BVH tree node's array index.

Parameters

uNode	BVH tree node
uindex1	Node array index
uindex2	Node array index