raycast method
Get intersections between a casted Ray and this LOD Raycaster.intersectObject will call this method.
Implementation
@override
	void raycast(Raycaster raycaster, List<Intersection> intersects){
		final levels = this.levels;
		if (levels.isNotEmpty) {
			_v1.setFromMatrixPosition(matrixWorld);
			final distance = raycaster.ray.origin.distanceTo( _v1 );
			getObjectForDistance(distance)?.raycast( raycaster, intersects );
		}
	}