World boundary shape for 3D collisions. World boundary shape for 3D collisions. It works like an infinite plane and will not allow any physics body to go to the negative side. Note that the [Plane]'s normal matters; anything "below" the plane will collide with it. If the [WorldBoundaryShape3D] is used in a [PhysicsBody3D], it will cause colliding objects placed "below" it to teleport "above" the plane. The [Plane] used by the [WorldBoundaryShape3D] for collision.