multyplayer

Prefabs/combine_zone.gd

@@ -54,6 +54,12 @@ func _on_body_entered(body: Node3D) -> void:
 	if _combining or body == _item:
 		return
 
+	# Combining is a world-state change: only the server/offline host runs it.
+	# (Clients never have the base item snapped, so their zone won't monitor, but
+	# guard explicitly in case of overlap during authority handoff.)
+	if not NetworkManager.owns_world():
+		return
+
 	var other := _find_combinable(body)
 	if not other:
 		return
@@ -75,11 +81,9 @@ func _combine(other_body: Node3D, result: PackedScene) -> void:
 		_combining = false
 		return
 
-	# Spawn the result at the base item's location, in world space.
+	# Spawn the result (networked) at the base item's location, in world space.
 	var base_transform := _item.global_transform
-	var result_instance: Node3D = result.instantiate()
-	_item.get_tree().current_scene.add_child(result_instance)
-	result_instance.global_transform = base_transform
+	var result_instance := NetworkManager.spawn_item(result.resource_path, base_transform)
 
 	# Free the base item and consume the incoming item.
 	snap_zone.drop_object()
@@ -90,7 +94,8 @@ func _combine(other_body: Node3D, result: PackedScene) -> void:
 		other_body.queue_free()
 
 	# Snap the result into the now-empty zone.
-	snap_zone.pick_up_object(result_instance)
+	if result_instance:
+		snap_zone.pick_up_object(result_instance)
 
 
 # Find a CombinableItem among the direct children of [param node].

Prefabs/net_pickable.gd

@@ -0,0 +1,64 @@
+class_name NetPickable
+extends Node
+
+## Networks an XRToolsPickable (RigidBody3D). Default authority is the server,
+## which simulates free items and syncs their transform. Grabbing an item with a
+## hand transfers authority to the grabbing client (its local kinematic grab
+## driver then drives the synced transform); releasing returns authority and the
+## throw velocity to the server. Non-authority peers keep the body frozen and
+## follow the synced transform, so only one machine ever simulates an item.
+
+@onready var _item: XRToolsPickable = get_parent() as XRToolsPickable
+
+var net_held_by := 0  # peer id currently holding (0 = free); kept consistent via NetworkManager
+var _was_authority := true
+
+
+func _ready() -> void:
+	if not _item:
+		push_error("NetPickable must be a child of an XRToolsPickable")
+		return
+	_item.grabbed.connect(_on_grabbed)
+	_item.released.connect(_on_released)
+	_was_authority = _item.is_multiplayer_authority()
+	_apply_authority_state()
+
+
+func _physics_process(_delta: float) -> void:
+	if not NetworkManager.is_online():
+		return
+	var mine := _item.is_multiplayer_authority()
+	if mine != _was_authority:
+		_was_authority = mine
+		_apply_authority_state()
+
+
+# Configure physics for whether we own this item or merely mirror it.
+func _apply_authority_state() -> void:
+	if not _item:
+		return
+	if _item.is_multiplayer_authority():
+		# We own physics: simulate the item whenever it is not held.
+		if not _item.is_picked_up():
+			_item.freeze = false
+	else:
+		# Someone else owns it: follow the synced transform kinematically.
+		_item.freeze = true
+		_item.freeze_mode = RigidBody3D.FREEZE_MODE_KINEMATIC
+
+
+func _on_grabbed(_pickable: Node3D, by: Node3D) -> void:
+	if not NetworkManager.is_online():
+		return
+	# Only hand grabs transfer authority; snap-zone grabs are server-driven.
+	if not (by is XRToolsFunctionPickup):
+		return
+	NetworkManager.request_item_authority.rpc_id(1, _item.get_path())
+
+
+func _on_released(_pickable: Node3D, by: Node3D) -> void:
+	if not NetworkManager.is_online():
+		return
+	if not (by is XRToolsFunctionPickup):
+		return
+	NetworkManager.release_item_authority.rpc_id(1, _item.get_path(), _item.linear_velocity, _item.angular_velocity)

Prefabs/net_pickable.gd.uid

@@ -0,0 +1 @@
+uid://6n784li8n5ck