intersectsSphere( sphere ) {

		const planes = this.planes;
		const center = sphere.center;
		const negRadius = - sphere.radius;

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

			const distance = planes[ i ].distanceToPoint( center );

			if ( distance < negRadius ) {

				return false;

			}

		}

		return true;

	}
Returns `true` if the given bounding sphere is intersecting this frustum.

@param {Sphere} sphere - The bounding sphere to test.
@return {boolean} Whether the bounding sphere is intersecting this frustum or not.