Networking_FpsDemo

一、創建場景。

命名場景爲Main

二、創建NetWorkManager空對象。

並添加腳本NetWorkManagerHUD

（

NetWorkManager

https://docs.unity3d.com/Manual/UNetManager.html?_ga=1.90521311.433409425.1476685957

The High Level API

https://docs.unity3d.com/Manual/UNetUsingHLAPI.html

）

三、創建遊戲同步Player三維對象。

並添腳本 NetworkIdentity，並將其 Local Player Authority參數設置爲True。將Player製作成預製體，然後將其從場景中刪除（Player Objectshttps://docs.unity3d.com/Manual/UNetPlayers.html?_ga=1.58169839.433409425.1476685957）

四、將Player預製體註冊到NetWorkManager上。

拖動Player到NetWorkManager的SpawnInfo的PlayerPrefab屬性上

五、爲Player添加運動操作腳本

using UnityEngine;

public class PlayerController : MonoBehaviour
{
    void Update()
    {
        var x = Input.GetAxis("Horizontal") * Time.deltaTime * 150.0f;
        var z = Input.GetAxis("Vertical") * Time.deltaTime * 3.0f;

        transform.Rotate(0, x, 0);
        transform.Translate(0, 0, z);
    }

}

六、測試本地以 LAN Host啓動遊戲。

（Network System Conceptshttps://docs.unity3d.com/Manual/UNetConcepts.html?_ga=1.124244047.433409425.1476685957），然後打包客戶端以client模式加入運行。

七、實現只控制本地對象。

將MonoBehaiver替換爲NetWorkBehaiver,並判斷是否是本地對象，否則返回。(NetWorkBehaiver:https://docs.unity3d.com/ScriptReference/Networking.NetworkBehaviour.html?_ga=1.56679535.433409425.1476685957)

然後在Player預製體上添加NetWorkTranform（NetWorkTransform:https://docs.unity3d.com/Manual/class-NetworkTransform.html?_ga=1.157733375.433409425.1476685957）

八、多人在線測試。

修改 Network Send Rate並再次測試，觀察流暢度

九、識別本地玩家。

在腳本中添加：

public override void OnStartLocalPlayer()

{

    GetComponent().material.color = Color.blue;

}

可以在本地本地玩家創建後將其顏色轉換爲藍色（Object Spawninghttps://docs.unity3d.com/Manual/UNetSpawning.html?_ga=1.94715225.433409425.1476685957）

十、創建本地射擊功能。製作子彈預製體，並添加剛體組件，修改PlayerController腳本，添加生成子彈的功能：using UnityEngine;

using UnityEngine.Networking;

public class PlayerController : NetworkBehaviour

{

    public GameObject bulletPrefab;

    public Transform bulletSpawn;

    void Update()

    {

        if (!isLocalPlayer)

        {

            return;

        }

        var x = Input.GetAxis("Horizontal") * Time.deltaTime * 150.0f;

        var z = Input.GetAxis("Vertical") * Time.deltaTime * 3.0f;

        transform.Rotate(0, x, 0);

        transform.Translate(0, 0, z);

        if (Input.GetKeyDown(KeyCode.Space))

        {

            Fire();

        }

    }

    void Fire()

    {

        // Create the Bullet from the Bullet Prefab

        var bullet = (GameObject)Instantiate(

            bulletPrefab,

            bulletSpawn.position,

            bulletSpawn.rotation);

        // Add velocity to the bullet

        bullet.GetComponent<RigidBody>().velocity = bullet.transform.forward * 6;

        // Destroy the bullet after 2 seconds

        Destroy(bullet, 2.0f);        

    }

    public override void OnStartLocalPlayer ()

    {

        GetComponent<MeshRenderer>().material.color = Color.blue;

    }

}，將子彈預製體和子彈生成點拖入到腳本上

十一、多人在線射擊。

在子彈上添加NetwordIdentity,NetworkTransform.並將NetWorkTranform中的NetworkSendRate

設置爲一，NetWorkIdentity上LocalPlayerAuthorit設置爲True.

此時進一步修改PlayerController腳本，實現只創建本地。

using UnityEngine;

using UnityEngine.Networking;

public class PlayerController : NetworkBehaviour

{

    public GameObject bulletPrefab;

    public Transform bulletSpawn;

    void Update()

    {

        if (!isLocalPlayer)

        {

            return;

        }

        var x = Input.GetAxis("Horizontal") * Time.deltaTime * 150.0f;

        var z = Input.GetAxis("Vertical") * Time.deltaTime * 3.0f;

        transform.Rotate(0, x, 0);

        transform.Translate(0, 0, z);

        if (Input.GetKeyDown(KeyCode.Space))

        {

            CmdFire();

        }

    }

    // This [Command] code is called on the Client …

    // … but it is run on the Server!

    [Command]

    void CmdFire()

    {

        // Create the Bullet from the Bullet Prefab

        var bullet = (GameObject)Instantiate(

            bulletPrefab,

            bulletSpawn.position,

            bulletSpawn.rotation);

        // Add velocity to the bullet

        bullet.GetComponent<Rigidbody>().velocity = bullet.transform.forward * 6;

        // Spawn the bullet on the Clients

        NetworkServer.Spawn(bullet);

        // Destroy the bullet after 2 seconds

        Destroy(bullet, 2.0f);

    }

    public override void OnStartLocalPlayer ()

    {

        GetComponent<MeshRenderer>().material.color = Color.blue;

    }

}

（RemoteActionshttps://docs.unity3d.com/Manual/UNetActions.html?_ga=1.170381669.433409425.1476685957 

Object Spawning https://docs.unity3d.com/Manual/UNetSpawning.html?_ga=1.125296335.433409425.1476685957）

十二，本地人物血量。

添加子彈邏輯代碼，實現碰撞後銷燬子彈

using UnityEngine;
using System.Collections;

public class Bullet : MonoBehaviour {
   
    void OnCollisionEnter()
    {
        Destroy(gameObject);
    }

}

添加人物血量腳本，並有受到攻擊掉血的方法。

using UnityEngine;

public class Health : MonoBehaviour

{

    public const int maxHealth = 100;

    public int currentHealth = maxHealth;

    public void TakeDamage(int amount)

    {

        currentHealth -= amount;

        if (currentHealth <= 0)

        {

            currentHealth = 0;

            Debug.Log("Dead!");

        }

    }

}

當子彈和人物發生碰撞時，需要調用人物Heath腳本的TackDamage方法，修改子彈腳本爲：

using UnityEngine;

using System.Collections;

public class Bullet : MonoBehaviour

{

    void OnCollisionEnter(Collision collision)

    {

        var hit = collision.gameObject;

        var health = hit.GetComponent<Health>();

        if (health != null)

        {

            health.TakeDamage(10);

        }

        Destroy(gameObject);

    }

}

添加世界座標中血量條，增加一個3維canvas,作爲Player的子物體，命名爲HealthBarCanvas.將大小設置爲（0.01，0.01，0.01）座標設置爲(0,1.5,0).添加兩個Image分別命名爲Background和Foreground，顏色設置爲紅色和藍色，設置父子關係，將Forground的中心點設置爲（0，0.5）錨點設置爲(0，0.5)（0，0.5）。

修改Health腳本更新血量顯示

using UnityEngine;

public class Health : MonoBehaviour

{

    public const int maxHealth = 100;

    public int currentHealth = maxHealth;

    public RectTransform healthBar;

    public void TakeDamage(int amount)

    {

        currentHealth -= amount;

        if (currentHealth <= 0)

        {

            currentHealth = 0;

            Debug.Log("Dead!");

        }

        healthBar.sizeDelta = new Vector2(currentHealth, healthBar.sizeDelta.y);

    }

}

記得將血條foreground賦予腳本。

血條需要看到攝像機才行，在血條上添加腳本Billboard

using UnityEngine;

using System.Collections;

public class Billboard : MonoBehaviour {

    void Update () {

        transform.LookAt(Camera.main.transform);

    }

}

此時由於血量沒有進行同步，子彈雖然在每個客戶端裏者存在，但由於碰撞的不同血量可能會完全不同

十三、血量同步

（Network System Concepts：https://docs.unity3d.com/Manual/UNetConcepts.html?_ga=1.136705525.433409425.1476685957）

修改Health腳本修改爲掉血只在服務端運行，然後通過    [SyncVar]  來進行變量同步到客戶端。

using UnityEngine;

using UnityEngine.UI;

using UnityEngine.Networking;

using System.Collections;

public class Health : NetworkBehaviour

{

    public const int maxHealth = 100;

    [SyncVar]

    public int currentHealth = maxHealth;

    public RectTransform healthBar;

    public void TakeDamage(int amount)

    {

        if (!isServer)

        {

            return;

        }

        currentHealth -= amount;

        if (currentHealth <= 0)

        {

            currentHealth = 0;

            Debug.Log("Dead!");

        }

        healthBar.sizeDelta = new Vector2(currentHealth, healthBar.sizeDelta.y);

    }

}

當作服務端的客戶端運行時可以看到血量的變化，因爲currentHealth雖然同步了，但並沒有觸發血量變化的事件。利用 SyncVar hook 可以在變量發生變化後，同步到UI.

Health腳本修改爲如下 ：

十四，重生

在服務端調用 ClientRpc 同步到客戶端（和Command相反）

實現當血量小於0時，在原點滿血復活效果（如果服務端僅僅將某個Player重置到原點，客戶端會因爲NetWorkTransform重寫這個Player的座標）

using UnityEngine;

using UnityEngine.UI;

using UnityEngine.Networking;

using System.Collections;

public class Health : NetworkBehaviour

{

    public const int maxHealth = 100;

    [SyncVar(hook = "OnChangeHealth")]

    public int currentHealth = maxHealth;

    public RectTransform healthBar;

    public void TakeDamage(int amount)

    {

        if (!isServer)

            return;

        currentHealth -= amount;

        if (currentHealth <= 0)

        {

            currentHealth = maxHealth;

            // called on the Server, but invoked on the Clients

            RpcRespawn();

        }

    }

    void OnChangeHealth(int currentHealth)

    {

        healthBar.sizeDelta = new Vector2(currentHealth, healthBar.sizeDelta.y);

    }

    [ClientRpc]

    void RpcRespawn()

    {

        if (isLocalPlayer)

        {

            // move back to zero location

            transform.position = Vector3.zero;

        }

    }

}

（RemoteActionshttps://docs.unity3d.com/Manual/UNetActions.html?_ga=1.170381669.433409425.1476685957）

十四，非Player對象的同步

非Player的遊戲對象由Server來控制，下面以ai敵人爲例。

創建一個EnemySpawner空物體，NetworkIdentity 設置 Server Only爲True,添加EnemySpawner 腳本來隨機生成敵人 ，重寫 OnStartServer方法

using UnityEngine;

using UnityEngine.Networking;

public class EnemySpawner : NetworkBehaviour

{

    public GameObject enemyPrefab;

    public int numberOfEnemies;

    public override void OnStartServer()

    {

        for (int i = 0; i < numberOfEnemies; i++)

        {

            var spawnPosition = new Vector3(

                Random.Range(-8.0f, 8.0f),

                0.0f,

                Random.Range(-8.0f, 8.0f));

            var spawnRotation = Quaternion.Euler(

                0.0f,

                Random.Range(0, 180),

                0.0f);

            var enemy = (GameObject)Instantiate(enemyPrefab, spawnPosition, spawnRotation);

            NetworkServer.Spawn(enemy);

        }

    }

}

(NetWorkBehaiver:https://docs.unity3d.com/Manual/class-NetworkBehaviour.html?_ga=1.158241279.433409425.1476685957)

製作敵人，將場景中的Player去掉PlayerController並適當修改造型後，拖回到Project面版中並命名爲Enemy。

然後將Enemy賦予EnemySpawner並註冊到NetWorkManager中的SpawnInfo的Spanwnableprefab中（注意Enemy的NetWorkIdentity還是需要選擇LocalPlayerAuthority,才能同步到每個場景中）

十五、銷燬敵人

攻擊敵人到血量爲0是，要上敵人銷燬，只需要將Health做適當修改:(提供destroyOnDeath可選擇)

using UnityEngine;

using UnityEngine.UI;

using UnityEngine.Networking;

using System.Collections;

public class Health : NetworkBehaviour

{

    public const int maxHealth = 100;

    public bool destroyOnDeath;

    [SyncVar(hook = "OnChangeHealth")]

    public int currentHealth = maxHealth;

    public RectTransform healthBar;

    public void TakeDamage(int amount)

    {

        if (!isServer)

            return;

        currentHealth -= amount;

        if (currentHealth <= 0)

        {

            if (destroyOnDeath)

            {

                Destroy(gameObject);

            }

            else

            {

                currentHealth = maxHealth;

                // called on the Server, will be invoked on the Clients

                RpcRespawn();

            }

        }

    }

    void OnChangeHealth(int currentHealth)

    {

        healthBar.sizeDelta = new Vector2(currentHealth, healthBar.sizeDelta.y);

    }

    [ClientRpc]

    void RpcRespawn()

    {

        if (isLocalPlayer)

        {

            // Set the player’s position to origin

            transform.position = Vector3.zero;

        }

    }

}

十六、生成與再生成

遊戲對象生成點的控制可以利用 NetworkStartPosition 來實現，只需要在從預先設置好座標點，當Player生成時，就可以選擇性的在這些點之間進行生成。

同時，NetworkManager身上有 Random and Round Robin兩和生成方式，分別是隨機在生成點之間進行生成，和順序在這些點之間生成。

當需要重新設置生成點，則需要用用戶自行找到生成點。

using UnityEngine;

using UnityEngine.UI;

using UnityEngine.Networking;

using System.Collections;

public class Health : NetworkBehaviour

{

    public const int maxHealth = 100;

    public bool destroyOnDeath;

    [SyncVar(hook = "OnChangeHealth")]

    public int currentHealth = maxHealth;

    public RectTransform healthBar;

    private NetworkStartPosition[] spawnPoints;

    void Start()

    {

        if (isLocalPlayer)

        {

            spawnPoints = FindObjectsOfType<NetworkStartPosition>();

        }

    }

    public void TakeDamage(int amount)

    {

        if (!isServer)

            return;

        currentHealth -= amount;

        if (currentHealth <= 0)

        {

            if (destroyOnDeath)

            {

                Destroy(gameObject);

            }

            else

            {

                currentHealth = maxHealth;

                // called on the Server, invoked on the Clients

                RpcRespawn();

            }

        }

    }

    void OnChangeHealth(int currentHealth)

    {

        healthBar.sizeDelta = new Vector2(currentHealth, healthBar.sizeDelta.y);

    }

    [ClientRpc]

    void RpcRespawn()

    {

        if (isLocalPlayer)

        {

            // Set the spawn point to origin as a default value

            Vector3 spawnPoint = Vector3.zero;

            // If there is a spawn point array and the array is not empty, pick one at random

            if (spawnPoints != null && spawnPoints.Length > 0)

            {

                spawnPoint = spawnPoints[Random.Range(0, spawnPoints.Length)].transform.position;

            }

            // Set the player’s position to the chosen spawn point

            transform.position = spawnPoint;

        }

    }

}