extends ColorRect

## Node which will change offset. If null, offset is constant
@export var tracked_node: Node2D
## Shortcut to get_parent()
@onready var star_system = get_parent()
## Color of nebula.
@export var color_background: Color

func _ready():
	material.set_shader_parameter("nebula_color", color_background)

func _physics_process(_delta):
	if tracked_node != null:
		material.set_shader_parameter("offset", tracked_node.global_position)