vtDynGeom Class Reference

Inheritance diagram for vtDynGeom:

Public Member Functions
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

vtDynGeom extends the vtGeode class with the ability to have dynamic geometry which changes every frame. The most prominent use of this feature is to do Continuous Level of Detail (CLOD) for terrain.

To implement, you must create your own subclass and override the following methods:

• DoRender()
• DoCalcBoundBox()
• DoCull()

Many helpful methods are provided to make doing your own view culling very easy:

• IsVisible(sphere)
• IsVisible(triangle)
• IsVisible(point)

See also

vtDynTerrainGeom

Member Function Documentation

int vtDynGeom::IsVisible

(

const FSphere &

sphere

)

const

Test a sphere against the view volume.

Returns

VT_AllVisible if entirely inside the volume, VT_Visible if partly inside, otherwise 0.

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

Test a 3d triangle against the view volume.

Returns

VT_AllVisible if entirely inside the volume, VT_Visible if partly intersecting, otherwise 0.

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

Test a sphere against the view volume.

Returns

VT_AllVisible if entirely inside the volume, VT_Visible if partly intersecting, otherwise 0.

bool vtDynGeom::IsVisible

(

const FPoint3 &

point

)

const

Test a single point against the view volume.

Returns

true if inside, false if outside.