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scenes/scripts/wood_pile.gd

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+extends Sprite2D
+
+@export var fade_duration: float = 0.5
+var tween: Tween
+
+func _ready():
+	# Start with outline invisible
+	material.set_shader_parameter("outline_alpha", 0.0)
+	start_continuous_fade()
+
+func start_continuous_fade():
+	tween = create_tween()
+	tween.set_loops() # Makes it loop infinitely
+	tween.tween_method(set_outline_alpha, 0.0, 1.0, fade_duration)
+	tween.tween_method(set_outline_alpha, 1.0, 0.0, fade_duration)
+
+func set_outline_alpha(value: float):
+	material.set_shader_parameter("outline_alpha", value)
+
+func stop_fade():
+	if tween:
+		tween.kill()