大家好，我是Wilson，繼上次的教學之後，這次要分享的是如何快速地建立連線，並認識Fusion基本的連線架構。

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裡面介紹了Fusion的基本功能，以及Fusion同步網路狀態的3大方法，有興趣的朋友可以免費領取喔！

重點回顧

• Network Runner是Fusion連線的核心、心臟，所有的連線都必須依賴他，因此要在最一開始時，先建立在場景上，也因為整個遊戲只需要一個Network Runner，所以Network Runner預設是一個Don ‘t Destory On Load物件
• 每一個網路物件都需要有Network Object元件
• 透過Runner的StartGame()方法可以開啟新的Session(房間)，並傳入必要參數：

1. GameMode：以什麼模式加入房間，可以是Server、Host、Client、AutoHostOrClient、Single
2. Session Name：房間名稱
3. Scene：當前的場景
4. Scene Manager：負責處理Fusion場景控制的物件，有特殊需求的話可以自己寫，但目前我們先使用Fusion提供的NetworkSceneManagerDefault就可以了。

• 實作INetworkRunnerCallbacks的物件會在重要的事件發生時，執行Callback的內容，如每當有玩家進入/離開房間時，會執行OnPlayerJoined/OnPlayerLeft，並傳入當前場景中的Network Runner及該名玩家的資料
• 為了讓物件的移動更順滑，我們會將擁有網路元件的物件作為空物件，真正的視覺物件放在其底下當子物件，再把視覺物件放到網路元件裡面的Interplation Target。
• 在網路上的物件生成/消除必須使用Runner的Spawn()以及Despawn()方法。Spawn()方法可以將生成出來的網路物件的Input Authority提拱給指定玩家(PlayerRef)。
• 使用Dictionary紀錄玩家資料以及其控制的角色物件，是為了之後方便追蹤。

Code

任何實作INetworkRunnerCallbacks的類別都要實作以下方法：

public void OnPlayerJoined(NetworkRunner runner, PlayerRef player) { }
public void OnPlayerLeft(NetworkRunner runner, PlayerRef player) { }
public void OnInput(NetworkRunner runner, NetworkInput input) { }
public void OnInputMissing(NetworkRunner runner, PlayerRef player, NetworkInput input) { }
public void OnShutdown(NetworkRunner runner, ShutdownReason shutdownReason) { }
public void OnConnectedToServer(NetworkRunner runner) { }
public void OnDisconnectedFromServer(NetworkRunner runner) { }
public void OnConnectRequest(NetworkRunner runner, NetworkRunnerCallbackArgs.ConnectRequest request, byte[] token) { }
public void OnConnectFailed(NetworkRunner runner, NetAddress remoteAddress, NetConnectFailedReason reason) { }
public void OnUserSimulationMessage(NetworkRunner runner, SimulationMessagePtr message) { }
public void OnSessionListUpdated(NetworkRunner runner, List<SessionInfo> sessionList) { }
public void OnCustomAuthenticationResponse(NetworkRunner runner, Dictionary<string, object> data) { }
public void OnReliableDataReceived(NetworkRunner runner, PlayerRef player, ArraySegment<byte> data) { }
public void OnSceneLoadDone(NetworkRunner runner) { }
public void OnSceneLoadStart(NetworkRunner runner) { }
public void OnHostMigration(NetworkRunner runner, HostMigrationToken hostMigrationToken) { }

BasicSpawner.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Fusion;
using Fusion.Sockets;
using System;
using UnityEngine.SceneManagement;

public class BasicSpawner : MonoBehaviour, INetworkRunnerCallbacks
{
    [SerializeField]
    private NetworkRunner networkRunner = null;

    [SerializeField]
    private NetworkPrefabRef playerPrefab;

    private Dictionary<PlayerRef, NetworkObject> playerList = new Dictionary<PlayerRef, NetworkObject>();

    private void Start()
    {
        StartGame(GameMode.AutoHostOrClient);
    }

    async void StartGame(GameMode mode)
    {
        networkRunner.ProvideInput = true;

        await networkRunner.StartGame(new StartGameArgs()
        {
            GameMode = mode,
            SessionName = "Fusion Room",
            Scene = SceneManager.GetActiveScene().buildIndex,
            SceneManager = gameObject.AddComponent<NetworkSceneManagerDefault>()
        });
    }

    public void OnPlayerJoined(NetworkRunner runner, PlayerRef player)
    {
        Vector3 spawnPosition = Vector3.up * 2;
        NetworkObject networkPlayerObject = runner.Spawn(playerPrefab, spawnPosition, Quaternion.identity, player);

        playerList.Add(player, networkPlayerObject);
    }

    public void OnPlayerLeft(NetworkRunner runner, PlayerRef player)
    {
        if (playerList.TryGetValue(player, out NetworkObject networkObject))
        {
            runner.Despawn(networkObject);
            playerList.Remove(player);
        }
    }

    public void OnInput(NetworkRunner runner, NetworkInput input) { }
    public void OnInputMissing(NetworkRunner runner, PlayerRef player, NetworkInput input) { }
    public void OnShutdown(NetworkRunner runner, ShutdownReason shutdownReason) { }
    public void OnConnectedToServer(NetworkRunner runner) { }
    public void OnDisconnectedFromServer(NetworkRunner runner) { }
    public void OnConnectRequest(NetworkRunner runner, NetworkRunnerCallbackArgs.ConnectRequest request, byte[] token) { }
    public void OnConnectFailed(NetworkRunner runner, NetAddress remoteAddress, NetConnectFailedReason reason) { }
    public void OnUserSimulationMessage(NetworkRunner runner, SimulationMessagePtr message) { }
    public void OnSessionListUpdated(NetworkRunner runner, List<SessionInfo> sessionList) { }
    public void OnCustomAuthenticationResponse(NetworkRunner runner, Dictionary<string, object> data) { }
    public void OnReliableDataReceived(NetworkRunner runner, PlayerRef player, ArraySegment<byte> data) { }
    public void OnSceneLoadDone(NetworkRunner runner) { }
    public void OnSceneLoadStart(NetworkRunner runner) { }
    public void OnHostMigration(NetworkRunner runner, HostMigrationToken hostMigrationToken) { }
}

PlayerController.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PlayerController : MonoBehaviour
{
    
}

專案Github

有需要的朋友可以在這裡看到本次教學的專案喔！