A parallax scrolling layer to be used with ParallaxBackground.
A ParallaxLayer must be the child of a ParallaxBackground node. Each ParallaxLayer can be set to move at different speeds relative to the camera movement or the ParallaxBackground.scroll_offset value.
This node's children will be affected by its scroll offset.
Note: Any changes to this node's position and scale made after it enters the scene will be ignored.
Vector2 motion_mirroring =
If the length of the viewport axis is bigger than twice the mirrored axis size, it will not repeat infinitely, as the parallax layer only draws 2 instances of the texture at any one time.
Vector2 motion_offset =
The ParallaxLayer's offset relative to the parent ParallaxBackground's ParallaxBackground.scroll_offset.
Vector2 motion_scale =
Multiplies the ParallaxLayer's motion. If an axis is set to
0, it will not scroll.