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 unity 方便的截图保存功能  新建一个摄像机用于截图,深度设为最低     
string fileName= Application.streamingAssetsPath + "/photo.jpg";
public void CaptureScreenByRT(Camera camera )
    {
        Rect rect = new Rect(0, 0, 100, 100);
        
        RenderTexture rt = new RenderTexture((int)rect.width, (int)rect.height, 0);
        
        camera.targetTexture = rt;
        camera.Render();
        
        RenderTexture.active = rt;
        Texture2D screenShot = new Texture2D((int)rect.width, (int)rect.height, TextureFormat.RGB24, false);
        
        screenShot.ReadPixels(rect, 0, 0);
        screenShot.Apply();
        
        camera.targetTexture = null;
        RenderTexture.active = null;
        GameObject.Destroy(rt);
        
        byte[] bytes = screenShot.EncodeToPNG();
        System.IO.File.WriteAllBytes(fileName, bytes);
    }
 
                
                
                
        
    
 
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