Inheritance diagram for SMTerrain:

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Public Member Functions
DTErr	Init (const vtElevationGrid *pGrid, float fZScale)
	initialization

Public Member Functions inherited from vtDynTerrainGeom
DTErr	BasicInit (const vtElevationGrid *pGrid)

virtual void	SetPolygonTarget (int iPolygonCount)

int	GetPolygonTarget () const

int	NumDrawnTriangles () const

Public Member Functions inherited from vtDynGeom
int	IsVisible (const FSphere &sphere) const

int	IsVisible (const FPoint3 &point0, const FPoint3 &point1, const FPoint3 &point2, const float fTolerance=0.0f) const

int	IsVisible (const FPoint3 &point, float radius) const

bool	IsVisible (const FPoint3 &point) const

Public Member Functions inherited from vtGeode
void	AddMesh (vtMesh *pMesh, int iMatIdx)

void	RemoveMesh (vtMesh *pMesh)

void	RemoveAllMeshes ()

void	AddTextMesh (vtTextMesh *pMesh, int iMatIdx, bool bOutline=true)

uint	NumMeshes () const

vtMesh *	GetMesh (int i) const

vtTextMesh *	GetTextMesh (int i) const

Public Member Functions inherited from NodeExtension
void	SetEnabled (bool bOn)

bool	GetEnabled () const

void	SetCastShadow (bool b)
	Set this node to cast a shadow, if it is under a vtShadow node. Default is false.

bool	GetCastShadow ()
	Get whether this node casts a shadow.

void	GetBoundSphere (FSphere &sphere, bool bGlobal=false)
	Get the Bounding Sphere of the node.

Detailed Description

: The SMTerrain class implements Seumas McNally's algorithm for regular-grid terrain LOD. It was implemented directly from correspondence from the dearly missed Seumas, and is highly similar to the implementation in his game Treadmarks.

: This implementation requires that the input heightfield is a square regular grid of dimension 2^n+1, e.g.. 1025, 2049, or 4097. Storage requirements are around 3-5 bytes/vertex. The data is represented in memory by a regular grid of height values, an implicit binary tree of variance values, and an explicit binary tree of visible faces.

: This is the fastest and most memory-efficient algorithm currently known for terrain rendering with a long viewing distance and an unconstrained viewpoint.

Public Member Functions