Ray shape for 3D collisions. Ray shape for 3D collisions, which can be set into a [PhysicsBody] or [Area]. A ray is not really a collision body; instead, it tries to separate itself from whatever is touching its far endpoint. It's often useful for characters. The ray's length. If [code]true[/code], allow the shape to return the correct normal. Default value: [code]false[/code].