ScreenCapture.CaptureScreenshotAsTexture

yield return new WaitForEndOfFrame();
var screenShotTexture = ScreenCapture.CaptureScreenshotAsTexture();
// 相比CaptureScreenshot，可以使用自定义路径保存图片
byte[] bytes = screenShotTexture.EncodeToPNG();
var filePath = $"Assets/test.png";
File.WriteAllBytes(filePath, bytes);

RenderTexture

• 获得RenderTexture

  • 方式一

    var renderTexture = RenderTexture.GetTemporary(Screen.width, Screen.height, 32, GraphicsFormat.R8G8B8A8_UNorm);
    ScreenCapture.CaptureScreenshotIntoRenderTexture(renderTexture);

  • 方式二

    var screenRenderTexture = new RenderTexture(width, height, 0, GraphicsFormat.R8G8B8A8_UNorm);var originTargetTexture = camera.targetTexture;camera.targetTexture = screenRenderTexture;camera.Render();camera.targetTexture = originTargetTexture;

• 异步取得渲染数据：UnityEngine.Rendering.AsyncGPUReadback.Request 传入RenderTexture、TextureFormat。注意这里的 TextureFormat 和 申请RenderTexture的 GraphicsFormat 的数据格式要一致，比如TextureFormat是 TextureFormat.RGBA32，GraphicsFormat 是 GraphicsFormat.R8G8B8A8_UNorm

  private GraphicsFormat _graphicsFormat = GraphicsFormat.R8G8B8A8_UNorm;
  private TextureFormat _textureFormat = TextureFormat.RGBA32;public void TakeScreenShot(Camera camera, string path)
  {// 设置camera.targetTexture为screenRenderTexture来将当前颜色缓冲输出到RenderTexture上，之后再重置相机设置var screenRenderTexture = new RenderTexture(width, height, 0, _graphicsFormat);var originTargetTexture = camera.targetTexture;camera.targetTexture = screenRenderTexture;camera.Render();camera.targetTexture = originTargetTexture;UnityEngine.Rendering.AsyncGPUReadback.Request(screenRenderTexture, 0, _textureFormat, OnCompleteReadback);
  }void OnCompleteReadback(UnityEngine.Rendering.AsyncGPUReadbackRequest request)
  {if (request.hasError){Debug.Log("GPU readback error detected.");return;}byte[] colors = request.GetData<byte>().ToArray();// 异步写入方法，不阻塞主线程，ImageConversion.EncodeArrayToPNG是线程安全的所以不会报 must run in main thread 的错误Task.Run(() => File.WriteAllBytes(_filePath, ImageConversion.EncodeArrayToPNG(colors, _graphicsFormat, width, height)));
  }

此方法截图是在其他线程异步写入，不阻塞主线程

参考：https://stackoverflow.com/questions/62864092/unity-extracting-camera-pixel-array-is-incredibly-slow