Add VRSpectatorCamera so the server viewport follows VR head

test/vr_spectator_camera.gd

@@ -0,0 +1,40 @@
+class_name VrSpectatorCamera
+extends Node
+
+# Debug tool: on a non-VR client, follows a connected VR client's head so you can spectate it.
+
+@export var players_path: NodePath = ^"../Players"
+
+@onready var _players: Node = get_node_or_null(players_path)
+var _camera: Camera3D
+
+
+func _ready() -> void:
+	var xr_interface := XRServer.find_interface("OpenXR")
+	if xr_interface and xr_interface.is_initialized():
+		SweetLogger.warning("{0} disabled - this instance is the VR client", [name])
+		return
+	if not _players:
+		SweetLogger.warning("{0} could not resolve players_path {1}", [name, players_path])
+		return
+	_camera = Camera3D.new()
+	add_child(_camera)
+	_camera.make_current()
+
+
+func _process(_delta: float) -> void:
+	if not _camera:
+		return
+	var head := _find_remote_head()
+	if head:
+		_camera.global_transform = head.global_transform
+
+
+# First connected player that isn't this local peer
+func _find_remote_head() -> Node3D:
+	var my_id := multiplayer.get_unique_id()
+	for player in _players.get_children():
+		if player.name == str(my_id):
+			continue
+		return player.get_node_or_null("Head")
+	return null