containsPoint( point ) {

		const planes = this.planes;

		for ( let i = 0; i < 6; i ++ ) {

			if ( planes[ i ].distanceToPoint( point ) < 0 ) {

				return false;

			}

		}

		return true;

	}
Returns `true` if the given point lies within the frustum.

@param {Vector3} point - The point to test.
@return {boolean} Whether the point lies within this frustum or not.