Godot 4多人RPG游戏主机与客户端建筑同步异常问题求助

问题现象 #

• 主机放置物品后仅自身可见，编辑器Remote标签页的PlayerBuildings节点下无显示
• 客户端放置物品后仅自身可见，Remote标签页有显示

报错信息 #

get_node: Node not found:"World/PlayerBuildings/@Camp1@3/MultiplayerSynchronizer" process_simplify_path: Condition "node == nullptr" is true.

节点树截图 #

网格系统代码 #

extends Node2D

@onready var camp_fire = preload("res://src/Scenes/camp.tscn")
var tile_size =16

enum {OBSTACTLE, COLLECTABLE,RESOURCE}
var grid_size = Vector2(160,160)
var grid = []


func _ready():
    for x in range(grid_size.x):
        grid.append([])
        for y in range(grid_size.y):
            grid[x].append(null)
    var positions = []
    for i in range (50):
        var xcoor = (randi() % int(grid_size.x))
        var ycoor = (randi() % int(grid_size.y))
        var grid_pos = Vector2(xcoor,ycoor)
        if not grid_pos in positions:
            positions.append(grid_pos)

func _input(event):
    if GameManager.enable:
        if event.is_action_pressed("LeftClick"):
            var mouse_pos = get_global_mouse_position()
            var multiX = int(round(mouse_pos.x)/tile_size)
            var numX = multiX*tile_size
            var multiY = int(round(mouse_pos.y)/tile_size)
            var numY = multiY*tile_size
            var new_pos = Vector2(multiX, multiY)
            var new_camp_fire = camp_fire.instantiate()
            new_camp_fire.name = str(new_camp_fire.name + str(multiplayer.get_unique_id()) )
            new_camp_fire.set_position(tile_size*new_pos)
            grid[multiX][multiY] = OBSTACTLE
            get_tree().root.get_node("World").get_node("PlayerBuildings").add_child(new_camp_fire)

解决方案 #

1. 切换到权威服务器架构 #

Godot多人游戏必须遵循服务器权威原则，所有节点创建/销毁操作由服务器统一处理，客户端仅发送请求，避免本地实例化导致的不同步。修改代码如下：

extends Node2D

@onready var camp_fire = preload("res://src/Scenes/camp.tscn")
var tile_size =16

enum {OBSTACTLE, COLLECTABLE,RESOURCE}
var grid_size = Vector2(160,160)
var grid = []


func _ready():
    for x in range(grid_size.x):
        grid.append([])
        for y in range(grid_size.y):
            grid[x].append(null)
    var positions = []
    for i in range (50):
        var xcoor = (randi() % int(grid_size.x))
        var ycoor = (randi() % int(grid_size.y))
        var grid_pos = Vector2(xcoor,ycoor)
        if not grid_pos in positions:
            positions.append(grid_pos)

func _input(event):
    if GameManager.enable:
        if event.is_action_pressed("LeftClick"):
            var mouse_pos = get_global_mouse_position()
            var multiX = int(round(mouse_pos.x)/tile_size)
            var multiY = int(round(mouse_pos.y)/tile_size)
            var grid_pos = Vector2(multiX, multiY)
            
            # 客户端请求服务器放置，服务器直接执行
            if multiplayer.is_client():
                rpc("request_place_campfire", grid_pos)
            else:
                if grid[grid_pos.x][grid_pos.y] == null:
                    place_campfire(grid_pos)

# 允许任意节点调用的RPC，仅服务器处理逻辑
@rpc("any_peer")
func request_place_campfire(grid_pos):
    if multiplayer.is_server() and grid[grid_pos.x][grid_pos.y] == null:
        place_campfire(grid_pos)

# 服务器统一执行的放置逻辑
func place_campfire(grid_pos):
    var new_camp_fire = camp_fire.instantiate()
    new_camp_fire.name = str(new_camp_fire.name + str(multiplayer.get_unique_id()))
    new_camp_fire.set_position(tile_size * grid_pos)
    new_camp_fire.set_network_master(1) # 设置服务器为节点主控
    
    grid[grid_pos.x][grid_pos.y] = OBSTACTLE
    get_tree().root.get_node("World/PlayerBuildings").add_child(new_camp_fire)

2. 修复MultiplayerSynchronizer报错 #

• 打开camp.tscn，确保场景根节点下包含MultiplayerSynchronizer节点
• 配置同步器的Properties列表，添加需要同步的属性（比如position、visible等）
• 检查节点路径：确保同步器的Root Path设置正确，避免找不到节点的报错

3. 同步网格状态 #

服务器维护唯一的网格数据，客户端需要通过RPC同步网格状态，避免本地网格与服务器不一致。可以在服务器放置物品后，广播网格更新：

# 在place_campfire函数末尾添加
rpc("sync_grid_update", grid_pos, OBSTACTLE)

@rpc("all")
func sync_grid_update(grid_pos, tile_type):
    grid[grid_pos.x][grid_pos.y] = tile_type

4. 验证Remote标签页显示 #

修改后，服务器（主机）创建的节点会出现在Remote标签页的PlayerBuildings下，所有客户端会同步显示该节点，解决之前的可见性不一致问题。

内容的提问来源于stack exchange，提问作者nicktehboy meny