Spatial 2D sound w/ reverb, first attempt

core/polygon/polygon.gd

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+@tool
+extends CollisionPolygon2D
+
+@export var color: Color = Color.WHITE:
+	set(v):
+		color = v
+		update_polygon()
+	get():
+		return color
+
+@export var update: bool:
+	set(v):
+		update_polygon()
+
+func update_polygon():
+	# normal polygon
+	$Polygon2D.polygon = polygon
+	$Polygon2D.color = color
+	# light occluder
+	var lo_polygon = OccluderPolygon2D.new()
+	lo_polygon.polygon = polygon
+	$LightOccluder2D.occluder = lo_polygon
+
+func _ready() -> void:
+	update_polygon()

core/polygon/polygon.tscn

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+[gd_scene load_steps=3 format=3 uid="uid://cbynoofsjcl45"]
+
+[ext_resource type="Script" path="res://core/polygon/polygon.gd" id="1_ga37f"]
+
+[sub_resource type="OccluderPolygon2D" id="OccluderPolygon2D_lp5j7"]
+
+[node name="Polygon" type="CollisionPolygon2D"]
+script = ExtResource("1_ga37f")
+
+[node name="Polygon2D" type="Polygon2D" parent="."]
+
+[node name="LightOccluder2D" type="LightOccluder2D" parent="."]
+editor_description = "For particle collisions"
+occluder = SubResource("OccluderPolygon2D_lp5j7")