Unity Photon PUN2材质同步异常求助：仅本地玩家可见材质变更

针对你用Unity Photon PUN2开发多人游戏时遇到的材质同步问题，以下是具体的排查方向和修复步骤：

1. 材质属性名称不匹配 #

检查Shader中定义的属性名是否和代码中一致：

• 若使用Unity标准Shader，Emission属性名应为_EmissionColor，而非代码中的_BaseEmissionColor；
• 若使用自定义Shader，确认_BaseEmissionColor和_FresnelColor是Shader中实际声明的属性名称，名称大小写、下划线都必须完全匹配。

2. 替换每帧RPC为同步属性（解决性能与同步延迟） #

当前代码每帧发送RPC会产生大量网络请求，易导致同步延迟和带宽浪费。改用Photon的**同步属性（SyncVar）**来同步状态，Photon会自动将状态同步到所有客户端：

修改代码示例： #

[SerializeField] private Material holoGatesMat;
[SerializeField] private Light holoLight;
[SerializeField] private GameObject holoGates;

// 定义同步属性，Photon自动同步这些值到所有客户端
[SyncVar] private Color emissionColor;
[SyncVar] private Color fresnelColor;
[SyncVar] private Color lightColor;
[SyncVar] private float lightIntensity;

private Material holoGatesMatInstance;

private void Awake()
{
    // 实例化材质副本，避免修改全局共享资源导致异常
    if (holoGatesMat != null)
    {
        holoGatesMatInstance = new Material(holoGatesMat);
        holoGates.GetComponent<Renderer>().material = holoGatesMatInstance;
    }
}

// 同步属性变更时自动触发本地更新
private void OnPhotonSerializeView(PhotonStream stream, PhotonMessageInfo info)
{
    if (stream.IsWriting)
    {
        // 发送端同步数据
        stream.SendNext(emissionColor);
        stream.SendNext(fresnelColor);
        stream.SendNext(lightColor);
        stream.SendNext(lightIntensity);
    }
    else
    {
        // 接收端更新本地状态
        emissionColor = (Color)stream.ReceiveNext();
        fresnelColor = (Color)stream.ReceiveNext();
        lightColor = (Color)stream.ReceiveNext();
        lightIntensity = (float)stream.ReceiveNext();
        
        // 应用到材质和灯光
        holoGatesMatInstance.SetColor("_BaseEmissionColor", emissionColor);
        holoGatesMatInstance.SetColor("_FresnelColor", fresnelColor);
        holoLight.color = lightColor;
        holoLight.intensity = lightIntensity;
    }
}

private IEnumerator HackProcess() {
    isHackProccess = true;
    photonView.RPC("remoteSound", RpcTarget.All);
    yield return new WaitForSeconds(3.5f);
    photonView.RPC("InitiateHacking", RpcTarget.All);
}

[PunRPC]
public void InitiateHacking() {
    holoGates.SetActive(true);
    // 初始化同步属性状态
    lightIntensity = 0;
    emissionColor = new Color(0, 0, 0, 0);
    fresnelColor = new Color(0, 0, 0, 0);

    StartCoroutine(AnimateHologramAppearance());

    //other part of my code...
}   

private IEnumerator AnimateHologramAppearance() {
    float duration = 1.5f;
    float time = 0;

    // 初始化状态
    lightColor = new Color(147f / 255f, 0f, 250f / 255f, 1f);
    lightIntensity = 0;
    emissionColor = new Color(0, 0, 0, 0);
    fresnelColor = new Color(0, 0, 0, 0);

    while (time < duration) {
        float t = time / duration;
        lightIntensity = Mathf.Lerp(0, 1, t);
        emissionColor = new Color(
            Mathf.Lerp(0, 32f / 255f, t), 
            Mathf.Lerp(0, 1f / 255f, t), 
            Mathf.Lerp(0, 1f, t), 
            Mathf.Lerp(0, 0.15f, t)
        );
        fresnelColor = new Color(
            Mathf.Lerp(0, 91f / 255f, t), 
            Mathf.Lerp(0, 0f, t), 
            Mathf.Lerp(0, 1f, t), 
            Mathf.Lerp(0, 0.15f, t)
        );

        time += Time.deltaTime;
        yield return null;
    }

    yield return new WaitForSeconds(1.5f);

    float flickerEndTime = Time.time + 5f;
    while (Time.time < flickerEndTime) {
        bool toggle = Random.Range(0, 2) > 0;
        if (toggle) {
            emissionColor = new Color(32f / 255f, 1f / 255f, 1f, 0.15f);
            fresnelColor = new Color(91f / 255f, 0f, 1f, 0.15f);
            lightColor = new Color(147f / 255f, 0f, 250f / 255f, 1f);
            lightIntensity = 1;
        } else {
            emissionColor = new Color(1f, 0f, 0f, 0.3f);
            fresnelColor = new Color(1f, 10f / 255f, 0f, 0.3f);
            lightColor = new Color(250f / 255f, 42f / 255f, 0f, 1f);
            lightIntensity = 1;
        }

        float randomDelay = Random.Range(0.05f, 0.1f);
        yield return new WaitForSeconds(randomDelay);
    }

    emissionColor = new Color(32f / 255f, 1f / 255f, 1f, 0.15f);
    fresnelColor = new Color(91f / 255f, 0f, 1f, 0.15f);
    lightColor = new Color(147f / 255f, 0f, 250f / 255f, 1f);
    lightIntensity = 1;

    yield return new WaitForSeconds(1.5f);

    float fadeDuration = 1.5f;
    float fadeTime = 0;
    while (fadeTime < fadeDuration) {
        float t = fadeTime / fadeDuration;
        lightIntensity = Mathf.Lerp(1, 0, t);
        lightColor = new Color(0f / 255f, 250f / 255f, 45f / 255f, 1f);
        emissionColor = new Color(
            Mathf.Lerp(5f / 255f, 0, t), 
            Mathf.Lerp(1f, 0, t), 
            Mathf.Lerp(1f / 255f, 0, t), 
            Mathf.Lerp(0.01f, 0, t)
        );
        fresnelColor = new Color(
            Mathf.Lerp(58f / 255f, 0, t), 
            Mathf.Lerp(1f, 0, t), 
            0, 
            Mathf.Lerp(0.01f, 0, t)
        );

        fadeTime += Time.deltaTime;
        yield return null;
    }

    photonView.RPC("TurnOffHologram", RpcTarget.All);
}

[PunRPC]
public void TurnOffHologram() {
    holoLight.enabled = false;
    holoGates.SetActive(false);
}

[PunRPC]
public void remoteSound()
{
    // 你的音效播放逻辑
}

3. 验证PhotonView配置 #

• 确保脚本所在GameObject的PhotonView组件中，Observed Components包含当前脚本（用于同步属性）；
• 确认RPC方法的访问修饰符为public（PUN2允许private RPC，但public更稳定）。

4. 避免修改全局材质资源 #

在Awake中实例化材质副本，防止修改Project中的原始材质导致所有使用该材质的对象异常，同时确保每个客户端的材质实例独立可控。

内容的提问来源于stack exchange，提问作者Wadish Developer