Unet Spawnable 预制件不遵循客户端的玩家预制件

Question

我遇到枪不粘在玩家身上的问题。它只发生在客户身上。正如你在屏幕上看到的，枪的位置对主机（右边的玩家）来说很好。 Gun Prefab 具有选中本地玩家权限的网络身份和网络转换，与玩家相同。这是我的播放器代码：

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

public class Player : NetworkBehaviour 
{

    [SerializeField] float speed = 10f;
    [HideInInspector] public GameObject playerGun;
    public GameObject gunPrefab;

    void Update() 
    {
        if (!isLocalPlayer)
        {
            return;
        }

        Movement();
        if (Input.GetKeyDown(KeyCode.I))
        {
            CmdGetGun();
        }

        if (playerGun)
            CarryGun();
    }

    private void Movement()
    {
        Vector3 position = new Vector3(Input.GetAxisRaw("Horizontal"), Input.GetAxisRaw("Vertical")).normalized * Time.deltaTime * speed;
        transform.position += position;
        MouseMovement();
    }

    private void MouseMovement()
    {
        Vector3 mousePosition = Camera.main.ScreenToWorldPoint(Input.mousePosition) - transform.position;
        mousePosition.Normalize();
        float rotation_z = Mathf.Atan2(mousePosition.y, mousePosition.x) * Mathf.Rad2Deg;
        transform.rotation = Quaternion.Euler(0f, 0f, rotation_z);
    }

    [Command]
    public void CmdGetGun()
    {
        Debug.Log("SPAWNING A GUN");
        playerGun = (GameObject)Instantiate(gunPrefab, transform.position, transform.rotation);
        NetworkServer.SpawnWithClientAuthority(playerGun, connectionToClient);
    }

    public void CarryGun()
    {
        Debug.Log("carring A GUN");
        playerGun.transform.position = new Vector3(transform.position.x, transform.position.y, transform.position.z - 1);
        playerGun.transform.rotation = transform.rotation;
    }
}

我花了几天时间想弄明白。我是 Unity 的新手，尤其是 Unet，也许我有些不明白。

我知道枪的位置是错误的，但是我会在处理这个问题后改变它。现在我只希望它在客户端和主机端都坚持播放器。

Answer 1

问题

此 Command 方法始终在 服务器 上执行 .. 属性 在服务器 上也是如此。

含义：您永远不会在

中仅在服务器端在客户端设置 playerGun

playerGun = Instantiate ...

因此，由于您的客户端从未获得其 playerGun 值集 CarryGun 永远不会在客户端上执行。

解决方案 1

为避免这种情况，您应该使用 ClientRpc 方法在所有客户端上也设置该值。

[Command]
public void CmdGetGun()
{
    Debug.Log("SPAWNING A GUN");
    playerGun = (GameObject)Instantiate(gunPrefab, transform.position, transform.rotation);
    NetworkServer.SpawnWithClientAuthority(playerGun, connectionToClient);

    // Tell the clients to set the playerGun reference. 
    // You can pass it as GameObject since it has a NetworkIdentity
    RpcSetGunOnClients(playerGun);
}

// Executed on ALL clients
// (which does not mean on all components but just the one of 
// this synched GameObject, just to be clear)
[ClientRpc]
private void RpcSetGunOnClients (GameObject gun)
{
    playerGun = gun;
}

解决方案 2

这是一个替代解决方案，其步骤与上面的步骤基本相同 ，但是 它不再需要 CarryGun 方法和 NetworkTransform，使得通过节省方法调用和网络带宽，您的代码更高效：

而不是在层次结构的顶层生成枪支到特定的全局位置和旋转

 playerGun = (GameObject)Instantiate(gunPrefab, transform.position, transform.rotation);

而不是一直更新它的位置和旋转到玩家的传输并通过 NetworkTransforms 单独传输它们，你可以简单地使它成为玩家 object 的 child本身使用例如Instantiate(Object original, Vector3 position, Quaternion rotation, Transform parent); 在服务器上：

 playerGun = (GameObject)Instantiate(gunPrefab, gunLocalPositionOffset, gunLocalRotationOffset, transform);

这应该始终将其保持在正确的位置，而无需 Update 并始终同步其位置和旋转，并且无需任何进一步的传输方法和值。

您所要做的就是再次拥有一个 ClientRpc 以便告诉客户也让这把枪成为您玩家的 child 使用例如SetParent(Trasnform parent, bool worldPositionStays):

playerGun.transform.SetParent(transform, false);

并在必要时应用局部位置和旋转偏移。同样，您可以使用一个值，每个人都可以从服务器访问或将其传递给 ClientRpc - 您的选择 ;)

所以你的方法现在看起来像

// In order to spawn the gun with an offset later
// It is up to you where those values should come from / be passed arround
// If you crate your Prefab "correctly" you don't need them at all
// 
// correctly means: the most top GameObject of the prefab has the 
// default values position(0,0,0) and rotation (0,0,0) and the gun fits perfect
// when the prefab is a child of the Player => You don't need any offsets at all
Vector3 gunLocalPositionOffset= Vector3.zero;
Quaternion gunLocalRotationOffset= Quaternion.identity;

[Command]
public void CmdGetGun()
{
    Debug.Log("SPAWNING A GUN");

    // instantiates the prefab as child of this gameObject
    // you still can spawn it with a local offset position
    // This will make its position be already synched in the Players own
    // NetworkTransform -> no need for a second one
    playerGun = (GameObject)Instantiate(gunPrefab, gunLocalPositionOffset, gunLocalRotationOffset, gameobject);
    
    // you wouldn't need this anymore since you won't change the spoition manually
    // NetworkServer.SpawnWithClientAuthority(playerGun, connectionToClient);
    NetworkServer.Spawn(playerGun);

    // Tell the clients to set the playerGun reference. 
    // You can pass it as GameObject since it has a NetworkIdentity
    RpcSetGunOnClients(playerGun);
}

// Executed on all clients
[ClientRpc]
private void RpcSetGunOnClients (GameObject gun)
{
    // set the reference
    playerGun = gun;

    // NetworkServer.Spawn or NetworkServer.SpawnWithClientAuthority doesn't apply 
    // the hierachy so on the Client we also have to make the gun a child of the player manually

    // use the flag worldPositionStays to avoid a localPosition offset
    playerGun.transform.SetParent(transform, false);

    // just to be very sure you also could (re)set the local position and rotation offset later
    playerGun.transform.localPosition = gunLocalPositionOffset;
    playerGun.transform.localrotation = gunLocalRotationOffset;
}

更新 1

要解决后来连接的客户端的问题，请参阅。

它建议使用 [SyncVar] 并覆盖 OnStartClient。采用的版本可能看起来像

 // Will be synched to the clients
 // In our case we know the parent but need the reference to the GunObject
 [SyncVar] public NetworkInstanceId playerGunNetId;

[Command]
public void CmdGetGun()
{
    Debug.Log("SPAWNING A GUN");
    playerGun = (GameObject)Instantiate(gunPrefab, gunLocalPositionOffset, gunLocalRotationOffset, transform);
    
    // Set the playerGunNetId on the Server
    // SyncVar will set on all clients including
    // newly connected clients
    playerGunNetId = playerGun.GetComponent<NetworkIdentity>().netId;

    NetworkServer.Spawn(playerGun);

    RpcSetGunOnClients(playerGun);
}

public override void OnStartClient()
{
    // When we are spawned on the client,
    // find the gun object using its ID,
    // and set it to be our child
    GameObject gunObject = ClientScene.FindLocalObject(playerGunNetId);
    gunObject.transform.SetParent(transform, false);
    gunObject.transform.localPosition = gunLocalPositionOffset;
    gunObject.transform.localrotation = gunLocalRotationOffset;
}

(注意您仍然需要ClientRpc用于已连接的客户端。)

更新2

Update1 中的方法可能不起作用，因为在执行 OnStartPlayer 时可能尚未设置 playetGunNetId。

为了克服这个问题，您可以为我们的 SyncVar 使用 hook method。像

// The null reference might somehow still come from
// ClientScene.FindLocalObject
[SyncVar(hook = "OnGunIdChanged"]
private NetworkInstanceId playerGunNetId;

// This method is executed on all clients when the playerGunNetId value changes. 
// Works when clients are already connected and also for new connections
private void OnGunIdChanged (NetworkInstanceId newValue)
{
    // Honestly I'm never sure if this is needed or not...
    // but in worst case it's just redundant
    playerGunNetId = newValue;
    
    GameObject gunObject = ClientScene.FindLocalObject(playerGunNetId);   
    gunObject.transform.SetParent(transform, false);
    gunObject.transform.localPosition = gunLocalPositionOffset;
    gunObject.transform.localrotation = gunLocalRotationOffset;
}

现在您甚至不再需要 ClientRpc，因为已经连接和新连接的客户端的一切都由 hook 处理。

Unet Spawnable 预制件不遵循客户端的玩家预制件

Unet Spawnable prefab not following Player Prefab on Client Side

networking

game-development

unity3d

unity3d-unet

问题

解决方案 1

解决方案 2

更新 1

更新2