Improve world authoring workflow

world/below_world_failsafe.gd

@@ -0,0 +1,24 @@
+@tool
+class_name BelowWorldFailsafe
+extends PlayerWaterTrigger
+
+@export_group("Failsafe Authoring")
+## Saved coverage volume that catches players below the playable world.
+@export_node_path("CollisionShape3D")
+var coverage_shape_path: NodePath = ^"Coverage"
+
+
+func _ready() -> void:
+	super()
+	if Engine.is_editor_hint():
+		update_configuration_warnings()
+
+
+func _get_configuration_warnings() -> PackedStringArray:
+	var warnings := PackedStringArray()
+	var coverage := get_node_or_null(coverage_shape_path) as CollisionShape3D
+	if coverage == null:
+		warnings.append("Add the saved Coverage collision shape.")
+	elif coverage.shape == null:
+		warnings.append("Assign a shape to the failsafe Coverage node.")
+	return warnings