ParaTerrain::TerrainBlock Class Reference

it represents the quad tree node of LOD terrain data More...

#include <TerrainBlock.h>

Public Member Functions
	TerrainBlock (TerrainBlock *pParent, bool useGeoMipmap=false)
	TerrainBlock (int homeVertex, int stride, Terrain *pTerrain, TerrainBlock *pParent, bool useGeoMipmap=false)
void	CalculateGeometry (Terrain *pTerrain)
	pre-compute data in this block. More...
void	Tessellate (uint32 *pCountStrips, Terrain *pTerrain)
	generate triangles for rendering in higher LOD. More...
void	RepairCracks (Terrain *pTerrain, uint32 *pCountFans)
	repair cracks in this block and child blocks. More...
bool	IsActive ()
int	GetStride ()
int	GetHomeIndex ()
bool	IsHole ()
float	GetMaxError ()
	the amount of vertex error introduced if this block is simplified as just two triangles
float	GetMaxElevation ()
float	GetMinElevation ()
void	EnableStrip (Terrain *pTerrain, bool bEnabled)
void	VertexChanged (Terrain *pTerrain)
void	VertexChanged (Terrain *pTerrain, int index1)
void	VertexChanged (Terrain *pTerrain, int index1, int index2)
void	IntersectRay (const CShapeRay &ray, Vector3 &intersectionPoint, float &lowestDistance, const Terrain *pTerrain)
bool	UpdateHoles (Terrain *pTerrain)
	update holes in the terrain. More...
short int	GetFrustumState ()
void	SetLod (int level, GeoMipmapChunkType type)
int	GetLodLevel ()
GeoMipmapChunkType	GetChunkType ()

Public Attributes
IndexInfo *	m_indexInfo
bool	m_useGeoMipmap
int	m_chunkCountX
int	m_lodLevel
GeoMipmapChunkType	m_chunkType

Friends
class	Terrain

Detailed Description

it represents the quad tree node of LOD terrain data

Member Function Documentation

CalculateGeometry()

void TerrainBlock::CalculateGeometry

(

Terrain *

pTerrain

)

pre-compute data in this block.

This is a recursive function.

RepairCracks()

void TerrainBlock::RepairCracks	(	Terrain *	pTerrain,
		uint32 *	pCountFans
	)

repair cracks in this block and child blocks.

This is a recursive function.

for the special condition

Tessellate()

void TerrainBlock::Tessellate	(	uint32 *	pCountStrips,
		Terrain *	pTerrain
	)

generate triangles for rendering in higher LOD.

This is a recursive function.

define to use depth first transversing

UpdateHoles()

bool TerrainBlock::UpdateHoles

(

Terrain *

pTerrain

)

update holes in the terrain.

This will set the m_bIsHold attribute of the terrain block. This function will recursively call itself. Call this function when the terrain block has already been built. return true if any of its child block contains a hole.

if the block is smaller than a terrain hole, check from the hole map whether this block is inside a hole

if this block is a container block, then this block will only be a hole if all of its child is a hole block

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

• Client/trunk/ParaEngineClient/terrain/TerrainBlock.h
• Client/trunk/ParaEngineClient/terrain/TerrainBlock.cpp