Fix clam spurt origin artifact (#118)

gathering/world_gatherable.gd

@@ -29,12 +29,16 @@ func configure(
 	entity_id = configured_entity_id
 	data = configured_data
 	type_id = data.type_id if data != null else StringName()
+	# Establish the authoritative transform before constructing transient visuals.
+	# Effects emitted before this point would begin at the default world origin.
+	apply_network_state(position, yaw, true)
 	if data != null and data.is_stationary_hotspot():
 		_ensure_water_spurt_visual()
 		_water_spurt_elapsed = (
 			float(abs(hash(entity_id)) % 1000) / 1000.0
 			* WATER_SPURT_INTERVAL_SECONDS
 		)
+		_emit_water_spurt()
 	else:
 		_ensure_visual()
 	if data != null and data.catch_data != null and _sprite != null:
@@ -50,7 +54,6 @@ func configure(
 			)
 		)
 		_sprite.rotation_degrees.x = data.sprite_tilt_degrees
-	apply_network_state(position, yaw, true)
 
 
 func apply_network_state(
@@ -147,7 +150,6 @@ func _ensure_water_spurt_visual() -> void:
 	hole.mesh = hole_mesh
 	hole.cast_shadow = GeometryInstance3D.SHADOW_CASTING_SETTING_OFF
 	_water_spurt_root.add_child(hole)
-	_emit_water_spurt()
 
 
 func _emit_water_spurt() -> void:
@@ -159,6 +161,7 @@ func _emit_water_spurt() -> void:
 	particles.amount = 6
 	particles.lifetime = 0.42
 	particles.one_shot = true
+	particles.local_coords = true
 	particles.explosiveness = 1.0
 	particles.direction = Vector3.UP
 	particles.spread = 32.0

tests/world_spawn_protocol_validation.gd

@@ -16,6 +16,10 @@ const CalendarSeasonType = preload("res://world/calendar_season.gd")
 
 
 func _initialize() -> void:
+	call_deferred(&"_run")
+
+
+func _run() -> void:
 	assert(NetworkProtocol.PROTOCOL_VERSION == 11)
 	assert(
 		NetworkWorldSpawnProtocol.CAPABILITY
@@ -23,7 +27,7 @@ func _initialize() -> void:
 	)
 	assert(NetworkWorldSpawnProtocol.SNAPSHOT_ENTITIES_PER_ENVELOPE <= 4)
 	_validate_catalog_statuses()
-	_validate_billboard_presentation()
+	await _validate_billboard_presentation()
 	_validate_envelopes()
 	print("World spawn protocol validation: PASS")
 	quit()
@@ -148,8 +152,27 @@ func _validate_billboard_presentation() -> void:
 	assert(not sprite.shaded)
 	gatherable.free()
 
+	var unconfigured_hotspot := WorldGatherableType.new()
+	unconfigured_hotspot.call("_ensure_water_spurt_visual")
+	assert(
+		unconfigured_hotspot.get_node_or_null(
+			"WaterSpurt/WaterDroplets"
+		) == null
+	)
+	unconfigured_hotspot.free()
+
+	var clam: GatherableData = Gatherables.get_entry(&"clam_manila")
+	assert(clam != null)
 	var hotspot := WorldGatherableType.new()
-	hotspot.call("_ensure_water_spurt_visual")
+	root.add_child(hotspot)
+	var configured_position := Vector3(24.0, 0.3, -11.0)
+	hotspot.configure(
+		"world:clam-presentation-regression",
+		clam,
+		configured_position,
+		0.0,
+	)
+	assert(hotspot.global_position.is_equal_approx(configured_position))
 	var hole := hotspot.get_node("WaterSpurt/BurrowMark") as MeshInstance3D
 	assert(hole != null)
 	assert(hole.cast_shadow == GeometryInstance3D.SHADOW_CASTING_SETTING_OFF)
@@ -158,6 +181,18 @@ func _validate_billboard_presentation() -> void:
 	assert(hole_material.shading_mode == BaseMaterial3D.SHADING_MODE_UNSHADED)
 	assert(hole_material.transparency == BaseMaterial3D.TRANSPARENCY_DISABLED)
 	assert(is_equal_approx(hole_material.albedo_color.a, 1.0))
+	var particles := hotspot.get_node(
+		"WaterSpurt/WaterDroplets"
+	) as CPUParticles3D
+	assert(particles != null and particles.emitting)
+	assert(particles.local_coords)
+	assert(particles.global_position.is_equal_approx(
+		configured_position + Vector3.UP * 0.035
+	))
+	hotspot.set_process(false)
+	await create_timer(0.6).timeout
+	await process_frame
+	assert(hotspot.get_node_or_null("WaterSpurt/WaterDroplets") == null)
 	hotspot.queue_free()