unity RenderTexture 保存为本地图片

public RenderTexture renderTexture;
void Start()
    {
            int width = renderTexture.width;
            int height = renderTexture.height;
            Texture2D texture2D = new Texture2D(width, height, TextureFormat.ARGB32, false);
            RenderTexture.active = renderTexture;
            texture2D.ReadPixels(new Rect(0, 0, width, height), 0, 0);
            texture2D.Apply();
            byte[] vs = texture2D.EncodeToPNG();

            
            string path = @"E:\one\"+ name + ".png";
            FileStream fileStream = new FileStream(path, FileMode.Create, FileAccess.Write);
            fileStream.Write(vs, 0, vs.Length);
            fileStream.Dispose();
            fileStream.Close();

    }