added multi

Scenes/multiplayer_world.gd

@@ -0,0 +1,29 @@
+extends Node3D
+
+## World script for the multiplayer scene. Consumes the host/join request set
+## by the main menu, and returns to the menu if the session ends.
+##
+## Connection-level only for now: no PlayersSpawner/ItemsSpawner here since the
+## networked Player/NetPickable scenes aren't ported yet (out of scope for this
+## change) — peers connect, but avatars/items don't sync.
+
+var xr_interface: XRInterface
+
+
+func _ready() -> void:
+	xr_interface = XRServer.find_interface("OpenXR")
+	if xr_interface and xr_interface.is_initialized():
+		DisplayServer.window_set_vsync_mode(DisplayServer.VSYNC_DISABLED)
+		get_viewport().use_xr = true
+
+	NetworkManager.session_ended.connect(_on_session_ended)
+	NetworkManager.connection_failed.connect(_on_connection_failed)
+	NetworkManager.world_ready()
+
+
+func _on_session_ended() -> void:
+	get_tree().change_scene_to_file("res://Scenes/mainMenu.tscn")
+
+
+func _on_connection_failed() -> void:
+	get_tree().change_scene_to_file("res://Scenes/mainMenu.tscn")