Splatter effect scales with source node scale

levels/mechanic_test/mechanic_test.gd

@@ -13,12 +13,6 @@ extends Node3D
 @onready var prop_test_spawn_point: Marker3D = %PropTestSpawnPoint
 @onready var item_test_spawn_point: Marker3D = %ItemTestSpawnPoint
 
-static var nodule_scene: PackedScene = load("res://src/world/gunk_node/grunk_nodule.tscn")
-static var alarm_scene: PackedScene = load("res://src/world/mechanics/alarm/gunk_alarm.tscn")
-static var signal_test_scene: PackedScene = load("res://levels/mechanic_test/signal_test.tscn")
-static var prop_test_scene: PackedScene = load("res://levels/mechanic_test/prop_test.tscn")
-static var item_test_scene: PackedScene = load("res://levels/mechanic_test/item_test.tscn")
-
 
 func reset() -> void:
 	print("Resetting level!")
@@ -26,6 +20,10 @@ func reset() -> void:
 	Callable(bulkhead, "close").call()
 	Callable(open_switch, "enable").call()
 	Callable(close_switch, "disable").call()
+
+	var signal_test_scene: PackedScene = load("res://levels/mechanic_test/signal_test.tscn")
+	var prop_test_scene: PackedScene = load("res://levels/mechanic_test/prop_test.tscn")
+	var item_test_scene: PackedScene = load("res://levels/mechanic_test/item_test.tscn")
 	_do_spawn(signal_test_spawn_point, signal_test_scene)
 	_do_spawn(prop_test_spawn_point, prop_test_scene)
 	_do_spawn(item_test_spawn_point, item_test_scene)
@@ -39,10 +37,12 @@ func _do_spawn(spawn_point: Node3D, scene: PackedScene) -> void:
 
 
 func spawn_nodule() -> void:
+	var nodule_scene: PackedScene = load("res://src/world/gunk_node/grunk_nodule.tscn")
 	_do_spawn(nodule_spawn_point, nodule_scene)
 
 
 func spawn_alarm() -> void:
+	var alarm_scene: PackedScene = load("res://src/world/mechanics/alarm/gunk_alarm.tscn")
 	_do_spawn(alarm_spawn_point, alarm_scene)
 
 

src/effects/grunk_splatter/grunk_splatter.gd

@@ -0,0 +1,34 @@
+class_name GrunkSplatter extends GPUParticles3D
+## Splatter effect with adjustable volume
+
+const BASE_VOLUME := -12.0
+const SCALE_FACTOR := 4.0
+
+const SCENE := preload("res://src/effects/grunk_splatter/grunk_splatter.tscn")
+
+@export var effect_scale := 1.0
+
+@onready var splatter_sfx: AudioStreamPlayer3D = %SplatterSFX
+@onready var sub_splatter: GPUParticles3D = %SubSplatter
+
+
+# Called when the node enters the scene tree for the first time.
+func _ready() -> void:
+	splatter_sfx.volume_db = BASE_VOLUME + SCALE_FACTOR * log(effect_scale) / log(2)
+	scale = Vector3.ONE * effect_scale
+
+	# Scale particles themselves
+	_scale_particles(self)
+	_scale_particles(sub_splatter)
+
+
+func _scale_particles(emitter: GPUParticles3D) -> void:
+	var mat := emitter.process_material as ParticleProcessMaterial
+	mat.scale_max = effect_scale
+	mat.scale_min = effect_scale
+
+
+static func build(_effect_scale: float = 1.0) -> GrunkSplatter:
+	var instance: GrunkSplatter = SCENE.instantiate()
+	instance.effect_scale = _effect_scale
+	return instance

src/effects/grunk_splatter/grunk_splatter.gd.uid

@@ -0,0 +1 @@
+uid://di5b65ehsfatj

src/effects/grunk_splatter/grunk_splatter.tscn

@@ -1,7 +1,8 @@
-[gd_scene load_steps=22 format=3 uid="uid://xlt78xc1tmkl"]
+[gd_scene load_steps=23 format=3 uid="uid://xlt78xc1tmkl"]
 
 [ext_resource type="Texture2D" uid="uid://cgwgmxwjgwbwr" path="res://assets/particles/splatter_2.png" id="1_5xu2x"]
 [ext_resource type="Texture2D" uid="uid://bhoai6xv53tqm" path="res://assets/particles/splatter_1.png" id="2_bt63p"]
+[ext_resource type="Script" uid="uid://di5b65ehsfatj" path="res://src/effects/grunk_splatter/grunk_splatter.gd" id="2_grvat"]
 [ext_resource type="AudioStream" uid="uid://di0j2xhgfc78s" path="res://assets/sfx/grunk/splat1.wav" id="3_t00bd"]
 [ext_resource type="AudioStream" uid="uid://d1w5gfmjj7tjk" path="res://assets/sfx/grunk/splat2.wav" id="4_2iem1"]
 [ext_resource type="Script" uid="uid://c5o1d2shq2qig" path="res://src/world/game_sound/game_sound_emitter.gd" id="5_2iem1"]
@@ -22,6 +23,7 @@ point_count = 2
 curve = SubResource("Curve_y6klh")
 
 [sub_resource type="ParticleProcessMaterial" id="ParticleProcessMaterial_5xu2x"]
+resource_local_to_scene = true
 lifetime_randomness = 0.57
 emission_shape = 1
 emission_sphere_radius = 1.0
@@ -65,6 +67,7 @@ point_count = 2
 curve = SubResource("Curve_t00bd")
 
 [sub_resource type="ParticleProcessMaterial" id="ParticleProcessMaterial_2iem1"]
+resource_local_to_scene = true
 lifetime_randomness = 0.55
 emission_shape = 1
 emission_sphere_radius = 0.9
@@ -112,8 +115,10 @@ one_shot = true
 explosiveness = 0.45
 process_material = SubResource("ParticleProcessMaterial_5xu2x")
 draw_pass_1 = SubResource("QuadMesh_y6klh")
+script = ExtResource("2_grvat")
 
 [node name="SubSplatter" type="GPUParticles3D" parent="."]
+unique_name_in_owner = true
 sorting_offset = 9.0
 emitting = false
 amount = 4
@@ -131,8 +136,9 @@ one_shot = true
 autostart = true
 
 [node name="SplatterSFX" type="AudioStreamPlayer3D" parent="."]
+unique_name_in_owner = true
 stream = SubResource("AudioStreamRandomizer_6adkd")
-volume_db = -16.0
+volume_db = -12.0
 unit_size = 6.0
 autoplay = true
 bus = &"SFX"

src/world/gunk_node/grunk_nodule.gd

@@ -25,9 +25,6 @@ const MIN_CHITTER_INTERVAL := 4.0
 @export var chitter_time_mean := 60.0
 @export var chitter_time_st_dev := 30.0
 
-@export_category("Game Scenes")
-@export var splatter_scene: PackedScene
-
 @onready var mesh_instance: MeshInstance3D = %MeshInstance3D
 
 @onready var chitter_sfx: AudioStreamPlayer3D = %ChitterSFX
@@ -53,13 +50,6 @@ func _process(delta: float) -> void:
 	shader.set_shader_parameter("vertex_inflation", pow(damage * jitter_inflation_factor, 3))
 
 
-func _destroy() -> void:
-	var splatter: GPUParticles3D = splatter_scene.instantiate()
-	add_sibling(splatter)
-	splatter.global_position = global_position
-	splatter.emitting = true
-
-
 func start_chitter_timer() -> void:
 	var interval := maxf(MIN_CHITTER_INTERVAL, randfn(chitter_time_mean, chitter_time_st_dev))
 	chitter_timer.start(interval)

src/world/gunk_node/grunk_nodule.tscn

@@ -1,7 +1,6 @@
-[gd_scene load_steps=12 format=4 uid="uid://2yqi5u5eo025"]
+[gd_scene load_steps=11 format=4 uid="uid://2yqi5u5eo025"]
 
 [ext_resource type="Script" uid="uid://07t7yhijru8f" path="res://src/world/gunk_node/grunk_nodule.gd" id="1_iyr82"]
-[ext_resource type="PackedScene" uid="uid://xlt78xc1tmkl" path="res://src/effects/grunk_splatter.tscn" id="2_m8r0a"]
 [ext_resource type="Material" uid="uid://bmab6i16v748m" path="res://assets/materials/grunk_jittery.material" id="3_eu6j6"]
 [ext_resource type="AudioStream" uid="uid://bb560r2wvjfht" path="res://assets/sfx/grunk/greeble1.wav" id="4_7fplw"]
 [ext_resource type="AudioStream" uid="uid://dunakapj3mb0h" path="res://assets/sfx/grunk/greeble2.wav" id="5_omayi"]
@@ -55,7 +54,6 @@ stream_3/stream = ExtResource("7_4kci5")
 collision_layer = 36
 collision_mask = 0
 script = ExtResource("1_iyr82")
-splatter_scene = ExtResource("2_m8r0a")
 durability = 3.0
 metadata/_custom_type_script = "uid://bypgxi0gy56yk"
 

src/world/gunk_node/gunk_node.gd

@@ -13,6 +13,9 @@ const JITTER_FADE_RATE := 0.8
 ## Value added to the player's grunk total on destruction.
 @export var value := 1000.0
 
+## Scale factor applied to the size and volume of the splatter effect on destruction.
+@export var splatter_scale := 1.0
+
 var _sustained_damage := 0.0
 var _hit_this_frame := false
 
@@ -55,6 +58,9 @@ func collect() -> void:
 ## Derived types should override `_destroy` as a lifecycle method.
 func destroy() -> void:
 	Game.manager.collect_grunk(value)
+	var splatter := GrunkSplatter.build(splatter_scale * scale.x)
+	add_sibling(splatter)
+	splatter.global_position = global_position
 	_destroy()
 	destroyed.emit()
 	queue_free()

src/world/gunk_node/mechanic_test.tscn

@@ -103,7 +103,7 @@ seamless = true
 seamless_blend_skirt = 0.5
 noise = ExtResource("7_aqwgb")
 
-[sub_resource type="ShaderMaterial" id="ShaderMaterial_qmfft"]
+[sub_resource type="ShaderMaterial" id="ShaderMaterial_umjw2"]
 resource_local_to_scene = true
 render_priority = 0
 shader = ExtResource("6_6agnv")
@@ -237,7 +237,7 @@ skeleton = NodePath("GunkHallBody")
 [node name="GunkHallBody" parent="GunkHall" instance=ExtResource("4_7v7un")]
 unique_name_in_owner = true
 initial_mask = ExtResource("5_llot1")
-source_gunk_material = SubResource("ShaderMaterial_qmfft")
+source_gunk_material = SubResource("ShaderMaterial_umjw2")
 
 [node name="CollisionShape3D" type="CollisionShape3D" parent="GunkHall/GunkHallBody"]
 shape = SubResource("ConcavePolygonShape3D_qjnj2")

src/world/mechanics/listener/listener.gd

@@ -7,8 +7,6 @@ signal triggered
 @export var quick_connect_to: SignalNode:
 	set = _editor_connect
 
-@export var splatter_scene: PackedScene
-
 # NOTE
 # trigger oscillation animation was generated using the formula
 # f(x) = e^(-0.25x) * cos(x * pi / 2 - pi/2) + 1 for x in {0, 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 20}
@@ -27,10 +25,6 @@ func trigger() -> void:
 	cooldown_timer.start()
 
 
-func _destroy() -> void:
-	add_sibling(splatter_scene.instantiate())
-
-
 func _editor_connect(node: SignalNode) -> void:
 	triggered.connect(node.trigger, CONNECT_PERSIST)
 	self.notify_property_list_changed()

src/world/mechanics/listener/listener.tscn

@@ -1,7 +1,6 @@
-[gd_scene load_steps=10 format=3 uid="uid://kctp5erogwcb"]
+[gd_scene load_steps=9 format=3 uid="uid://kctp5erogwcb"]
 
 [ext_resource type="Script" uid="uid://bde7cglaqobkd" path="res://src/world/mechanics/listener/listener.gd" id="1_htscg"]
-[ext_resource type="PackedScene" uid="uid://xlt78xc1tmkl" path="res://src/effects/grunk_splatter.tscn" id="2_2ibh1"]
 [ext_resource type="Script" uid="uid://cfsiyhhrcua6o" path="res://src/world/game_sound/game_sound_listener.gd" id="2_htscg"]
 
 [sub_resource type="ConcavePolygonShape3D" id="ConcavePolygonShape3D_2ibh1"]
@@ -58,7 +57,6 @@ _data = {
 collision_layer = 36
 collision_mask = 0
 script = ExtResource("1_htscg")
-splatter_scene = ExtResource("2_2ibh1")
 durability = 3.0
 value = 4000.0
 metadata/_custom_type_script = "uid://bypgxi0gy56yk"

src/world/mechanics/relay/gunk_relay.gd

@@ -8,9 +8,11 @@ signal triggered
 ## Emitted when `pulse` is called, after a short delay.
 signal pulsed
 
+@export_category("Editor Tools")
 @export var quick_connect_to: SignalNode:
 	set = _editor_connect
 
+@export_category("Game Scenes")
 @export var editor_arrow_scene: PackedScene
 
 var _busy := false

src/world/mechanics/relay/gunk_relay.tscn

@@ -115,6 +115,7 @@ collision_mask = 0
 script = ExtResource("1_rdv5j")
 editor_arrow_scene = ExtResource("2_nfkbq")
 value = 800.0
+splatter_scale = 0.2
 
 [node name="MeshInstance3D" type="MeshInstance3D" parent="."]
 gi_mode = 2