intersectsLine( line ) {

		// Note: this tests if a line intersects the plane, not whether it (or its end-points) are coplanar with it.

		const startSign = this.distanceToPoint( line.start );
		const endSign = this.distanceToPoint( line.end );

		return ( startSign < 0 && endSign > 0 ) || ( endSign < 0 && startSign > 0 );

	}
Returns `true` if the given line segment intersects with (passes through) the plane.

@param {Line3} line - The line to test.
@return {boolean} Whether the given line segment intersects with the plane or not.