template<class T>
class makVrv::DtOctree< T >

Octree datastructure for managing scene nodes. This is a loose octree implementation, meaning that each octant child of the octree actually overlaps it's siblings by a factor of .5. This guarantees that any thing that is half the size of the parent will fit completely into a child, with no splitting necessary.

Inheritance diagram for makVrv::DtOctree< T >:

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Public Types
typedef std::list < DtOctreeNode< T > * >	NodeList

typedef std::vector < DtOctreeNode< T > * >	NodeVector

Public Member Functions
	DtOctree (DtOctree parent, DtOctree treeRoot, size_t maxDepth)

	~DtOctree ()

void	addNode (DtOctreeNode< T > *)

void	removeNode (DtOctreeNode< T > *)

int	numNodes ()

bool	isTwiceSize (const DtAxisAlignedBoundingBox< T > &box) const

void	getChildIndexes (const DtAxisAlignedBoundingBox< T > &, int x, int y, int *z) const

void	getCullBounds (DtAxisAlignedBoundingBox< T > *) const

void	updateOctreeNode (DtOctreeNode< T > *pOctreeNode)

void	addOctreeNode (DtOctreeNode< T > pOctreeNode, DtOctree< T > pOctree, size_t depth=0)

void	removeOctreeNode (DtOctreeNode< T > *pOctreeNode)

void	findVisibleObjects (NodeVector &visibleNodes, DtOctree pOctree, const DtCamera< T > pCamera, bool foundVisible)

void	findVisibleObjects (NodeVector &visibleNodes, DtOctree pOctree, const Frustum< T > pFrustum, bool foundVisible)

Public Attributes
DtAxisAlignedBoundingBox< T >	myBox

DtVector3< T >	myHalfSize

DtOctree *	myChildren [2][2][2]

NodeList	myNodes

Protected Member Functions
void	ref ()

void	unref ()

Protected Attributes
int	myNumNodes

DtOctree *	myParent

DtOctree *	myOctreeRoot

size_t	myMaxDepth

Member Typedef Documentation

template<class T>

typedef std::list< DtOctreeNode<T> * > makVrv::DtOctree< T >::NodeList

template<class T>

typedef std::vector< DtOctreeNode<T> * > makVrv::DtOctree< T >::NodeVector

Constructor & Destructor Documentation

template<class T>

makVrv::DtOctree< T >::DtOctree	(	DtOctree< T > *	parent,
		DtOctree< T > *	treeRoot,
		size_t	maxDepth
	)

CTOR.

template<class T>

makVrv::DtOctree< T >::~DtOctree ( )

DTOR.

Member Function Documentation

template<class T>

void makVrv::DtOctree< T >::addNode ( DtOctreeNode< T > * )

Adds an Octree scene node to this octree level. This is called by the OctreeSceneManager after it has determined the correct Octree to insert the node into.

template<class T>

void makVrv::DtOctree< T >::removeNode ( DtOctreeNode< T > * )

Removes an Octree scene node to this octree level.

template<class T>

int makVrv::DtOctree< T >::numNodes ( )

inline

Returns the number of scene nodes attached to this octree.

template<class T>

bool makVrv::DtOctree< T >::isTwiceSize ( const DtAxisAlignedBoundingBox< T > & box ) const

Determines if this octree is twice as big as the given box. This method is used by the OctreeSceneManager to determine if the given box will fit into a child of this octree.

template<class T>

void makVrv::DtOctree< T >::getChildIndexes	(	const DtAxisAlignedBoundingBox< T > &	,
		int *	x,
		int *	y,
		int *	z
	)		const

Returns the appropriate indexes for the child of this octree into which the box will fit.

This is used by the OctreeSceneManager to determine which child to traverse next when finding the appropriate octree to insert the box. Since it is a loose octree, only the center of the box is checked to determine the octant.

template<class T>

void makVrv::DtOctree< T >::getCullBounds ( DtAxisAlignedBoundingBox< T > * ) const

Creates the AxisAlignedBoundingBox<T> used for culling this octree. Since it's a loose octree, the culling bounds can be different than the actual bounds of the octree.

template<class T>

void makVrv::DtOctree< T >::updateOctreeNode ( DtOctreeNode< T > * pOctreeNode )

template<class T>

void makVrv::DtOctree< T >::addOctreeNode	(	DtOctreeNode< T > *	pOctreeNode,
		DtOctree< T > *	pOctree,
		size_t	depth = `0`
	)

template<class T>

void makVrv::DtOctree< T >::removeOctreeNode ( DtOctreeNode< T > * pOctreeNode )

template<class T>

void makVrv::DtOctree< T >::findVisibleObjects	(	NodeVector &	visibleNodes,
		DtOctree< T > *	pOctree,
		const DtCamera< T > *	pCamera,
		bool	foundVisible
	)

template<class T>

void makVrv::DtOctree< T >::findVisibleObjects	(	NodeVector &	visibleNodes,
		DtOctree< T > *	pOctree,
		const Frustum< T > *	pFrustum,
		bool	foundVisible
	)

template<class T>

void makVrv::DtOctree< T >::ref ( )

inlineprotected

Increments the overall node count of this octree and all its parents.

Referenced by makVrv::DtOctree< double >::ref().

template<class T>

void makVrv::DtOctree< T >::unref ( )

inlineprotected

Decrements the overall node count of this octree and all its parents.

Referenced by makVrv::DtOctree< double >::unref().

Member Data Documentation

template<class T>

DtAxisAlignedBoundingBox<T> makVrv::DtOctree< T >::myBox

The bounding box of the octree This is used for octant index determination and rendering, but not culling.

template<class T>

DtVector3<T> makVrv::DtOctree< T >::myHalfSize

Vector containing the dimensions of this octree / 2.

template<class T>

DtOctree* makVrv::DtOctree< T >::myChildren[2][2][2]

3D array of children of this octree. Children are dynamically created as needed when nodes are inserted in the Octree. If, later, all the nodes are removed from the child, it is still kept around.

template<class T>

NodeList makVrv::DtOctree< T >::myNodes

Public list of SceneNodes attached to this particular octree.

template<class T>

int makVrv::DtOctree< T >::myNumNodes

protected

number of SceneNodes in this octree and all its children.

Referenced by makVrv::DtOctree< double >::numNodes(), makVrv::DtOctree< double >::ref(), and makVrv::DtOctree< double >::unref().

template<class T>

DtOctree* makVrv::DtOctree< T >::myParent

protected

parent octree