Gunkable clear_total_updated signal also includes delta since last call

src/effects/grunk_dust/grunk_dust.gd

@@ -2,22 +2,21 @@ class_name GrunkDust extends GPUParticles3D
 
 @export var emit_scale := 0.1
 
-var _last_clear_total := 0.0
 var _emitting_this_frame := false
 
 
-func _on_gunkable_clear_total_updated(clear_total: float) -> void:
+func _on_gunkable_clear_total_updated(_clear_total: float, delta: float) -> void:
-	var delta := maxf(clear_total - _last_clear_total, 0)
-
 	amount_ratio = clampf(delta * emit_scale, 0, 1)
 	if delta > 0:
 		_emitting_this_frame = true
 
-	_last_clear_total = clear_total
-
 
 func _on_gunkable_painted_at_point(point: Vector3, normal: Vector3) -> void:
-	look_at_from_position(point, point + normal, global_basis.y)
+	# An arbitrary orthogonal vector
+	# NOTE: will not be orthogonal 100% of the time, as a consequence of the Hairy Ball Theorem
+	# ... No, seriously.
+	var ortho := Vector3(normal.y + normal.z, normal.z - normal.x, -normal.x - normal.y)
+	look_at_from_position(point, point + normal, ortho)
 
 
 func _process(_delta: float) -> void:

src/props/overhead_light/overhead_light.gd

@@ -18,5 +18,5 @@ func _deferred_init() -> void:
 	gunkable.trigger_recompute()
 
 
-func _on_clear_total_updated(clear_total: float) -> void:
+func _on_clear_total_updated(clear_total: float, _delta: float) -> void:
 	spot_light_3d.visible = clear_total > threshold

src/props/wall_switch/wall_switch.gd

@@ -83,7 +83,7 @@ func _animation_finished(anim_name: StringName) -> void:
 		interactive.enabled = enabled
 
 
-func _on_clear_total_updated(clear_total: float) -> void:
+func _on_clear_total_updated(clear_total: float, _delta: float) -> void:
 	if not clean and clear_total >= CLEAN_THRESHOLD:
 		_on_clean()
 

src/world/gunkable/gunkable.gd

@@ -2,7 +2,7 @@ class_name Gunkable extends Node
 ## Component behavior for gunkable props & geometry.
 
 ## Emitted from the main thread after the clear total is asynchronously updated.
-signal clear_total_updated(clear_total: float)
+signal clear_total_updated(clear_total: float, delta: float)
 
 ## Emitted from the main thread any time a point is painted
 signal painted_at_point(point: Vector3, normal: Vector3)
@@ -263,7 +263,7 @@ func _process(_delta: float) -> void:
 	_mutex.unlock()
 	var delta := new_total - _prev_clear_total
 	if abs(delta) > CLEAR_TOTAL_EPSILON:
-		clear_total_updated.emit(new_total)
+		clear_total_updated.emit(new_total, delta)
 		# Do not fire signal on first compute after initialization
 		# This prevents the player from collecting the grunk from the initial mask.
 		if _prev_clear_total >= 0 and World.instance:

src/world/gunkable/gunkable.tscn

@@ -1,12 +1,7 @@
-[gd_scene load_steps=5 format=3 uid="uid://cdi5sl60mw1po"]
+[gd_scene load_steps=3 format=3 uid="uid://cdi5sl60mw1po"]
 
 [ext_resource type="Script" uid="uid://co0g2klfmor48" path="res://src/world/gunkable/gunkable.gd" id="1_47xoo"]
 [ext_resource type="Script" uid="uid://bom5qysgfvap1" path="res://src/world/gunkable/draw_controller.gd" id="2_srn13"]
-[ext_resource type="PackedScene" uid="uid://c3iv00vmdqxp0" path="res://src/effects/grunk_dust/grunk_dust.tscn" id="3_vad3y"]
-
-[sub_resource type="CapsuleMesh" id="CapsuleMesh_3mpo3"]
-radius = 0.1
-height = 1.0
 
 [node name="Gunkable" type="Node" groups=["Persistent"]]
 script = ExtResource("1_47xoo")
@@ -47,19 +42,6 @@ grow_horizontal = 2
 grow_vertical = 2
 script = ExtResource("2_srn13")
 
-[node name="GunkDust" parent="." instance=ExtResource("3_vad3y")]
-top_level = true
-emitting = false
-amount = 64
-lifetime = 1.2
-
-[node name="DebugMesh" type="MeshInstance3D" parent="GunkDust"]
-transform = Transform3D(1, 0, 0, 0, -4.37114e-08, -1, 0, 1, -4.37114e-08, 0, 0, 0)
-visible = false
-mesh = SubResource("CapsuleMesh_3mpo3")
-
-[connection signal="clear_total_updated" from="." to="GunkDust" method="_on_gunkable_clear_total_updated"]
-[connection signal="painted_at_point" from="." to="GunkDust" method="_on_gunkable_painted_at_point"]
 [connection signal="visibility_changed" from="MaskViewport/MaskClear" to="MaskViewport/MaskControl" method="_set_dirty"]
 [connection signal="visibility_changed" from="MaskViewport/MaskTexture" to="MaskViewport/MaskControl" method="_set_dirty"]
 [connection signal="draw" from="MaskViewport/MaskControl" to="." method="_on_mask_painted"]