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前言

Netcode for GameObjects 是 Unity 官方推出的一套用于开发多人网络游戏的框架，旨在简化基于 Unity 引擎的多人游戏开发流程。它允许开发者轻松地在多个客户端之间同步游戏对象（GameObject）的状态、处理网络通信以及管理玩家连接等核心功能，尤其适合中小型多人游戏项目。
链接: 官方地址

一、安装 Netcode for GameObjects

打开 Unity 项目（建议使用 Unity 2021.3 或更高版本）。
进入 Package Manager（Window → Package Manager）。
点击左上角 “+” 图标 → Add package by name…
输入包名 com.unity.netcode.gameobjects 并安装（确保勾选 “Enable Preview Packages” 以获取最新版本）。

直接搜索下载也可以。

二、做个小Dome

doem的内容就是：一个客户端随机移动圆球位置，其他客户端会同步显示变化。

1.NetcodeManageNet

创建一个场景，在场景创建一个空物体挂载NetcodeManage组件,并选择UnityTransport，选择后会自动挂载UnityTransport脚本

2.创建UI

创建4个按钮：，一个text和InputField 。并挂载脚本，如下图

3.创建预制体

创建一个圆球，挂载NetwrokObject和NetworkTransform
NetworkTransform 的pocition Rotation Scale全部勾选(多人同步：位置、旋转、大小)

NetworkManage 添加这个预制件，如下图

4.代码介绍

UI代码

using System.Net;
using System.Net.NetworkInformation;
using Unity.Netcode;
using Unity.Netcode.Samples;
using Unity.Netcode.Transports.UTP;
using UnityEngine;
using UnityEngine.UI;
namespace Twq
{public class UI_Init : MonoBehaviour{public Transform NetworkManager_;public Text text_IP;public Button HostBtn;public Button ServerBtn;public InputField inputField;public Button ClientBtn;public GameObject obj01;public GameObject obj02;public Button RandomBtn;private void Awake(){text_IP.text = GetIP();var networkManager = NetworkManager_.GetComponent<NetworkManager>();UnityTransport unityTransport = networkManager.GetComponent<UnityTransport>();//服务器地址填写：0.0.0.0   本地可连接，外网也可链接（放在云服务器上才行）//其他客户端连接时  输入 服务器IP  即可HostBtn.onClick.AddListener(() => {unityTransport.SetConnectionData("0.0.0.0", 7777);networkManager.StartHost();obj01.SetActive(false);obj02.SetActive(true);});ServerBtn.onClick.AddListener(() => {unityTransport.SetConnectionData("0.0.0.0", 7777);networkManager.StartServer();obj01.SetActive(false);});ClientBtn.onClick.AddListener(() => {if (inputField.text != null && inputField.text != ""){unityTransport.SetConnectionData(inputField.text, 7777);networkManager.StartClient();obj01.SetActive(false);obj02.SetActive(true);}else{Debug.Log("请输入服务器的IP");}});RandomBtn.onClick.AddListener(() => {if (!networkManager.IsClient){Debug.Log("没有 连上");}if (networkManager.LocalClient != null){// Get `BootstrapPlayer` component from the player's `PlayerObject`if (networkManager.LocalClient.PlayerObject.TryGetComponent(out BootstrapPlayer bootstrapPlayer)){// Invoke a `ServerRpc` from client-side to teleport player to a random position on the server-sidebootstrapPlayer.RandomTeleportServerRpc();}}});}private string GetIP(){string ipv4 = "";foreach (NetworkInterface item in NetworkInterface.GetAllNetworkInterfaces()){NetworkInterfaceType _type1 = NetworkInterfaceType.Wireless80211;NetworkInterfaceType _type2 = NetworkInterfaceType.Ethernet;if (item.NetworkInterfaceType == _type1 || item.NetworkInterfaceType == _type2 && item.OperationalStatus == OperationalStatus.Up){foreach (UnicastIPAddressInformation ip in item.GetIPProperties().UnicastAddresses){if (ip.Address.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork){ipv4 = ip.Address.ToString();}}}}return ipv4;}}
}

随机位置代码

using UnityEngine;namespace Unity.Netcode.Samples
{/// <summary>/// Component attached to the "Player Prefab" on the `NetworkManager`./// </summary>public class BootstrapPlayer : NetworkBehaviour{/// <summary>/// If this method is invoked on the client instance of this player, it will invoke a `ServerRpc` on the server-side./// If this method is invoked on the server instance of this player, it will teleport player to a random position./// </summary>/// <remarks>/// Since a `NetworkTransform` component is attached to this player, and the authority on that component is set to "Server",/// this transform's position modification can only be performed on the server, where it will then be replicated down to all clients through `NetworkTransform`./// </remarks>[ServerRpc]public void RandomTeleportServerRpc(){var oldPosition = transform.position;transform.position = GetRandomPositionOnXYPlane();var newPosition = transform.position;print($"{nameof(RandomTeleportServerRpc)}() -> {nameof(OwnerClientId)}: {OwnerClientId} --- {nameof(oldPosition)}: {oldPosition} --- {nameof(newPosition)}: {newPosition}");}private static Vector3 GetRandomPositionOnXYPlane(){return new Vector3(Random.Range(-3f, 3f), Random.Range(-3f, 3f), 0f);}}
}

总结

项目源码： 链接