A 3D world boundary (half-space) shape used for physics collision. A 3D world boundary shape, intended for use in physics. [WorldBoundaryShape3D] works like an infinite plane that forces all physics bodies to stay above it. The [member plane]'s normal determines which direction is considered as "above" and in the editor, the line over the plane represents this direction. It can for example be used for endless flat floors. The [Plane] used by the [WorldBoundaryShape3D] for collision.