Question

我目前正在尝试制作一个小型绘图游戏，其中两个玩家可以通过网络同时绘制。

我正在使用GameObject和TrailRenderer来绘制线条。

现在只有主机播放器的图纸显示在两台机器上。

如果客户端玩家点击并尝试绘制，我可以看到生成了一个新对象但转换没有更新。生成的预制件有一个NetworkIdentity（已选中“本地播放器权限”）和NetworkTransform。以下脚本由两个玩家生成，并且还具有NetworkIdentity（已选中本地播放器权限）。

我认为我实际上在对CmdTrailUpdate做错了以及如何处理它，但我无法弄清楚是什么。

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

public class TrailDrawer : NetworkBehaviour {

    private Plane objPlane;
    private GameObject currentTrail;
    private Vector3 startPos;
    public GameObject trail;

    public void Start()
    {
        objPlane = new Plane(Camera.main.transform.forward * -1, this.transform.position);
    }

    // Update is called once per frame
    void FixedUpdate() {
        if (isLocalPlayer) {
            if (Input.GetMouseButtonDown(0)) {
                CmdSpawn();
            } else if (Input.GetMouseButton(0)) {
                CmdTrailUpdate();
            }
        }
    }

    [Command]
    private void CmdTrailUpdate() {
        Ray mRay = Camera.main.ScreenPointToRay(Input.mousePosition);
        float rayDistance;
        if (objPlane.Raycast(mRay, out rayDistance)) {
            currentTrail.transform.position = mRay.GetPoint(rayDistance);
        }
    }

    [Command]
    private void CmdSpawn(){
        Ray mRay = Camera.main.ScreenPointToRay(Input.mousePosition);

        float rayDistance;
        if (objPlane.Raycast(mRay, out rayDistance)) {
            startPos = mRay.GetPoint(rayDistance);
            currentTrail = (GameObject)Instantiate(trail, startPos, Quaternion.identity);
            NetworkServer.Spawn(currentTrail);
        }
    }
}

Answer 1

我认为你的问题是：

[Command]表示：从客户端调用方法，但只在服务器上执行。

=＆GT;您只在服务器上执行方法CmdSpawn和CmdTrailUpdate。

但是：

服务器如何知道您的客户Input.mousePosition
您不希望从服务器camera.main进行光线投射，而是来自客户端。

<强>解决方案：

在客户端上执行本地操作并将[Cmd]方法上的位置作为参数传递给服务器。
由于您说对象已经有NetworkTransform，因此您不需要将更新的位置传输到服务器，因为NetworkTransform已经为您执行了此操作。因此，从客户端调用CmdTrailUpdate并不是必要的。

但是：在产生对象后，您必须告诉正在呼叫CmdSpawn的客户，这是他当地currentTrail的位置，他必须更新。我只需将调用客户端gameObject传递给CmdSpawn方法，然后在服务器上调用[ClientRpc]方法来设置此客户端的currentTrail对象

（我假设在这里，您发布的脚本与玩家对象相关联。如果不是这样，那么您需要获得玩家＆＃39而不是this.gameObject行。 ; s gameObject以另一种方式。）

void FixedUpdate() {
    if (!isLocalPlayer) return;

    if (Input.GetMouseButtonDown(0)) {
        // Do the raycast and calculation on the client
        Ray mRay = Camera.main.ScreenPointToRay(Input.mousePosition);

        float rayDistance;
        if (objPlane.Raycast(mRay, out rayDistance)) {
            startPos = mRay.GetPoint(rayDistance);

            // pass the calling Players gameObject and the
            // position as parameter to the server
            CmdSpawn(this.gameObject, startPos);
        }
    } else if (Input.GetMouseButton(0)) {
        // Do the raycast and calculation on the client
        Ray mRay = Camera.main.ScreenPointToRay(Input.mousePosition);

        float rayDistance;
        if (objPlane.Raycast(mRay, out rayDistance)) {
            // only update your local object on the client
            // since they have NetworkTransform attached
            // it will be updated on the server (and other clients) anyway
            currentTrail.transform.position = mRay.GetPoint(rayDistance);
        }
    }
}

[Command]
private void CmdSpawn(GameObject callingClient, Vector3 spawnPosition){
    // Note that this only sets currentTrail on the server
    currentTrail = (GameObject)Instantiate(trail, spawnPosition, Quaternion.identity);
    NetworkServer.Spawn(currentTrail);

    // set currentTrail in the calling Client
    RpcSetCurrentTrail(callingClient, currentTrail);
}

// ClientRpc is somehow the opposite of Command
// It is invoked from the server but only executed on ALL clients
// so we have to make sure that it is only executed on the client
// who originally called the CmdSpawn method
[ClientRpc]
private void RpcSetCurrentTrail(GameObject client, GameObject trail){
    // do nothing if this client is not the one who called the spawn method
    if(this.gameObject != client) return;

    // also do nothing if the calling client himself is the server
    // -> he is the host
    if(isServer) return;

    // set currentTrail on the client
    currentTrail = trail;
}

Unity Unet单击时更新转换

1 个答案: