Question

我想在所有客户端上单击GameObject时在所有客户端上更改其材质。我是UNET的新手，我认为我在概念上存在缺陷。所以基本上我想做的是：

在NetworkPlayer上向场景中的对象发射光线
从播放器发送[Command]
在此[Command]中，调用对象上的[ClientRpc]
在[ClientRpc]中更改该对象的材料

我的播放器：

using UnityEngine;
using UnityEngine.Networking;

// This script is on my Game Player Prefab
// (removed the cam movement part)
public class CamMovement : NetworkBehaviour
{
    void Update()
    {
        if (!isLocalPlayer)
        {
            return;
        }

        if (Input.GetMouseButtonDown(0))
        {
            Ray ray = cam.ScreenPointToRay(Input.mousePosition);
            RaycastHit hit;
            if (Physics.Raycast(ray, out hit))
                CmdNextColor(hit.transform.gameObject);
        } 
    }

    [Command]
    public void CmdNextColor(GameObject hitObject)
    {
        RPC_ColorChange colorChange = hitObject.GetComponent<RPC_ColorChange>();
        if (colorChange != null)
        {
            colorChange.RpcNextColor();
        }
    }
}

我的对象

using UnityEngine;
using UnityEngine.Networking;
using UnityEngine.UI;

public class RPC_ColorChange : NetworkBehaviour {

    public Material[] material;
    [SyncVar]
    int curColOfThisObject;
    Text text;

    private void Start()
    {
        text = GetComponentInChildren<Text>();
    }


    [ClientRpc]
    public void RpcNextColor()
    {
        if (!isClient)
            return;

        if (material.Length > 0)
        {
            Material curMaterial = this.GetComponent<MeshRenderer>().material;

            curColOfThisObject++;
            if (curColOfThisObject >= material.Length)
                curColOfThisObject = 0;

            curMaterial = material[curColOfThisObject];
        }
    }

    private void Update()
    {
        if (isClient)
        {
            text.text = "new color of this object: " + curColOfThisObject.ToString();
        }
    }

}

会发生什么：对象上的文本将更改为适当的颜色，但是材质永远不会更改。如何更改材料？

奖金问题：如果有人知道如何设计UNET游戏的好教程，请告诉我。

Answer 1

您的问题是您在客户端计算了curColOfThisObject的值，但同时使用了[SyncVar]。

从[SyncVar] Docu：

这些变量的值将从服务器同步到客户端

->不要在RpcNextColor中更改在客户端上的值，而是已经在CmdNextColor中更改在服务器上。否则curColOfThisObject将立即被服务器上从未更改的默认值覆盖。我将把值作为[ClientRpc]中的参数传递给客户端，因此从技术上讲，您甚至根本不需要[SyncVar]。

在CamMovement

[Command]
public void CmdNextColor(GameObject hitObject)
{
    RPC_ColorChange colorChange = hitObject.GetComponent<RPC_ColorChange>();
    if (colorChange != null)
    {
        colorChange.NextColor();
        // after calculating a new curColOfThisObject send it to clients (doesn't require [SyncVar] anymore)
        colorChange.RpcNextColor(curColOfThisObject);
    }
}

在RPC_ColorChange

// Make the calculation of the value on the server side
[Server]
private void NextColor()
{
    if (material.Length > 0)
    {
        Material curMaterial = this.GetComponent<MeshRenderer>().material;

        curColOfThisObject++;
        if (curColOfThisObject >= material.Length)
            curColOfThisObject = 0;

        // set the material also on the server
        curMaterial = material[curColOfThisObject];
    }
}

[ClientRpc]
public void RpcNextColor(int newValue)
{
    if (!isClient) return;

    // easier to debug if you keep the curColOfThisObject variable
    curColOfThisObject = newValue;

    if(newValue=> material.Length)
    {
        Debug.LogError("index not found in material");
        return;
    }

    // instead of curColOfThisObject  you could also just use the newValue
    // but this is easier to debug
    curMaterial = material[curColOfThisObject];
}

如果您想坚持使用[SyncVar]，也可以完全跳过ClientRpc，而将hook设为[SyncVar]，

在CamMovement

[Command]
public void CmdNextColor(GameObject hitObject)
{
    RPC_ColorChange colorChange = hitObject.GetComponent<RPC_ColorChange>();
    if (colorChange != null)
    {
        colorChange.NextColor();
    }
}

在RPC_ColorChange

[SyncVar(hook = "OnNextColor")]
private int curColOfThisObject;

// Make the calculation of the value on the server side
[Server]
private void NextColor()
{
    if (material.Length > 0)
    {
        Material curMaterial = this.GetComponent<MeshRenderer>().material;

        curColOfThisObject++;
        if (curColOfThisObject >= material.Length)
            curColOfThisObject = 0;

        // set the material also on the server
        curMaterial = material[curColOfThisObject];
    }
}

// This method automatically gets called when the value of
// curColOfObject is changed to newValue on the server
private void OnNextColor(int newValue)
{
    if (!isClient) return;

    // easier to debug if you keep the curColOfThisObject  variable
    curColOfThisObject = newValue;

    if(newValue=> material.Length)
    {
        Debug.LogError("index not found in material");
        return;
    }

    // instead of curColOfThisObject  you could also just use the newValue
    // but this is easier to debug
    curMaterial = material[curColOfThisObject];
}

一点点额外的东西：在通过网络发送内容之前，我会先检查RPC_ColorChange组件的存在。

if (Input.GetMouseButtonDown(0))
{
    Ray ray = cam.ScreenPointToRay(Input.mousePosition);
    RaycastHit hit;
    if (Physics.Raycast(ray, out hit))
    {
        if(hit.GetComponent<RPC_ColorChange>()!=null)
        {
            CmdNextColor(hit.transform.gameObject);
        }
    }
}

请注意，您可能击中了孩子或父母，而不是您想击中的实际物体。您将必须使用RPC_ColorChange或GetComponentInChildren在子代或父代中寻找GetComponentInParent组件。

Answer 2

在处理Command函数之后调用RpcFunctions是有点反常理的：

在播放器预制板上：

[Command]
    public void CmdNextColor(GameObject hitObject)
    {
        RPC_ColorChange colorChange = hitObject.GetComponent<RPC_ColorChange>();
        if (colorChange != null)
        {
            int curColor = colorChange.GetCurColor();

            // change color +1 on the clients
            colorChange.RpcNextColor(curColor);

            // assign a SyncVar with the current color
            colorChange.SyncColorVar();
        }
    }

现在按以下顺序调用函数：
1）SyncColorVar（）
2）RpcNextColor（）

测试项目：gitlab.com/KlausUllrich/networkTest

在Unity中使用Unet更改GameObjects上的材质

2 个答案: