vtDynGeom Class Reference

Inheritance diagram for vtDynGeom:

List of all members.

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)
bool	IsVisible (const FPoint3 &point) const

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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

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Member Function Documentation

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 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 &	point,
		float	radius
	)

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.