* plane. The position of the actor represents the origin of the
* plane, and the orientation of the actor represents the direction
* of the plane normal. Make the plane sufficiently large if the shadows are
* clipped.
*/
* plane. The position of the actor represents the origin of the
* plane, and the orientation of the actor represents the direction
* of the plane normal. Make the plane sufficiently large if the shadows are
* clipped.
*/