c# - 从相机截取屏幕截图然后在 (WaitForEndOfFrame) 上禁用它是否正确？

Question

我制作了这个非常简单的脚本，它应该附加到带有 renderTexure 的非事件相机游戏对象。如果相机 Gameobject 处于事件状态，则假设仅将一帧记录到 renderTexure，然后以 .png 格式保存到路径。之后应该禁用相机。

    public static string path;

void Update()
{
    StartCoroutine(SSOT());
}

public static void SaveRTToFileToSharing()
{
    RenderTexture rt = Resources.Load<RenderTexture>(@"Render Texure/ScreenShot") as RenderTexture;

    RenderTexture.active = rt;
    Texture2D tex = new Texture2D(rt.width, rt.height, TextureFormat.RGB24, false);
    tex.ReadPixels(new Rect(0, 0, rt.width, rt.height), 0, 0);
    //RenderTexture.active = null;
    tex.Apply();
    byte[] bytes;
    bytes = tex.EncodeToPNG();

    path = Application.persistentDataPath + "Test Shot.png";
    System.IO.File.WriteAllBytes(path, bytes);
    Destroy(tex);
}

IEnumerator SSOT()
{
    yield return new WaitForEndOfFrame();
    SaveRTToFileToSharing();
    gameObject.SetActive(false);
}

该脚本按我的预期工作，但我不确定它是否真的只记录一帧或更多帧。如果你要改变什么，你会改变什么？

Answer 1

应该没问题，因为您在启用它的同一帧中停用了该对象。

无论如何，只是为了确保我不会使用每帧调用的 Update，只需将 StartCoroutine 调用移动到 OnEnable 即可。每次游戏对象被激活时都会调用它。

private void OnEnable()
{
    StartCoroutine(SSOT());
}

---

为了提高性能，有些事情你只能做一次并重复使用它们——当然取决于你的优先级:如果你的优先级是很少的内存使用，而性能对屏幕截图来说无关紧要，那么你就很好当然。否则我可能会这样做

private RenderTexture rt;
private Texture2D tex;
private string path;

private void Awake ()
{
    // Do this only once and keep it around while the game is running
    rt = (RenderTexture) Resources.Load<RenderTexture>(@"Render Texure/ScreenShot");

    tex = new Texture2D(rt.width, rt.height, TextureFormat.RGB24, false);

    path = Application.persistentDataPath + "Test Shot.png";
}

private void SaveRTToFileToSharing()
{
    RenderTexture.active = rt;

    tex.ReadPixels(new Rect(0, 0, rt.width, rt.height), 0, 0);
    //RenderTexture.active = null;
    tex.Apply();
    byte[] bytes;
    bytes = tex.EncodeToPNG();

    // This happens async so your game can continue meanwhile 
    using (var fileStream = File.Open(path, FileMode.OpenOrCreate, FileAccess.Write))
    {
        fileStream.WriteAsync(bytes, 0, bytes.Length);
    }
}