kemena::kFrustum Class Reference

View frustum defined by six planes extracted from a view-projection matrix. More...

#include <koctree.h>

Public Member Functions
void	extractFromMatrix (const kMat4 &viewProjection)
	Extract the six frustum planes from a combined view-projection matrix.
kFrustumTestResult	testAABB (const kAABB &aabb) const
	Test an AABB against the frustum.
bool	intersectsAABB (const kAABB &aabb) const
	Quick reject: returns false if the AABB is fully outside.

Detailed Description

View frustum defined by six planes extracted from a view-projection matrix.

Call extractFromMatrix() with (projection * view) each frame before querying.

Member Function Documentation

extractFromMatrix()

void kemena::kFrustum::extractFromMatrix

(

const kMat4 &

viewProjection

)

Extract the six frustum planes from a combined view-projection matrix.

Uses the Gribb-Hartmann method (row combination of the VP matrix). The planes are stored in the form n·x + d = 0 where positive values are inside the frustum.

Parameters

viewProjection

projection * view matrix.

intersectsAABB()

bool kemena::kFrustum::intersectsAABB

(

const kAABB &

aabb

)

const

Quick reject: returns false if the AABB is fully outside.

testAABB()

kFrustumTestResult kemena::kFrustum::testAABB

(

const kAABB &

aabb

)

const

Test an AABB against the frustum.

Returns

Outside — AABB is fully outside at least one plane. Intersecting — AABB crosses one or more planes. Inside — AABB is fully inside all six planes.

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

• Source/include/koctree.h