Restructure into core/ and content/official/

game/scenes/camera_3d.gd

@@ -0,0 +1,56 @@
+extends Camera3D
+
+## Owns dart input. The camera does the raycast because the raycast IS a
+## camera operation — projecting a screen point into the world.
+##
+## The dart exposes begin_drag / update_drag / release_drag and never looks
+## for the camera itself. This script decides who to call them on.
+
+const RAY_LENGTH := 1000.0
+
+var _held_dart: Dart = null
+
+
+func _unhandled_input(event: InputEvent) -> void:
+	if event is InputEventMouseButton:
+		var mb := event as InputEventMouseButton
+		if mb.button_index != MOUSE_BUTTON_LEFT:
+			return
+		if mb.pressed:
+			_try_grab(mb.position)
+		else:
+			_release()
+
+	elif event is InputEventMouseMotion and _held_dart != null:
+		_held_dart.update_drag(self, (event as InputEventMouseMotion).position)
+
+
+func _try_grab(screen_pos: Vector2) -> void:
+	var hit := _raycast(screen_pos)
+	if hit.is_empty():
+		return
+
+	var body = hit.get("collider")
+	if body is Dart:
+		_held_dart = body as Dart
+		# NOTE: two args, not three. The old start_drag(camera, mouse_pos, point)
+		# passed mouse_pos but never used it — begin_drag only needs the hit point.
+		_held_dart.begin_drag(self, hit["position"])
+
+
+func _release() -> void:
+	if _held_dart == null:
+		return
+	_held_dart.release_drag()
+	_held_dart = null
+
+
+func _raycast(screen_pos: Vector2) -> Dictionary:
+	var params := PhysicsRayQueryParameters3D.create(
+		project_ray_origin(screen_pos),
+		project_ray_origin(screen_pos) + project_ray_normal(screen_pos) * RAY_LENGTH
+	)
+	if _held_dart != null:
+		params.exclude = [_held_dart.get_rid()]
+
+	return get_world_3d().direct_space_state.intersect_ray(params)