Frustum

Camera view frustum defined by six world-space planes.

Frustum represents the visible region of a camera as six bounding planes. It is used for culling tests and visibility checks against bounding boxes. The planes are extracted from a view-projection matrix and normalized so distances are in world units.

Constructor

Creates a frustum from a view-projection matrix.

new Frustum(m): Frustum;

Parameter	Description
m: mat4	The combined view-projection matrix.

Methods

setWithViewProjection() void

Re-extracts the six planes from a view-projection matrix.

setWithViewProjection(m): void;

Parameter	Description
m: mat4	The combined view-projection matrix.

intersectsWithBox3() boolean

Tests whether a box is at least partly inside the frustum. The test is conservative. A box outside the frustum but near a corner can be reported as intersecting, which only costs a draw of an offscreen object.

intersectsWithBox3(box): boolean;

Parameter	Description
box: Box3	The world-space box to test.