Unity的三种截取屏幕方式

 //截图方式一
    private void CaptureUnity(string mFileName)
    {
        //全屏截图,图片保存路径，提高分辨率系数
        Application.CaptureScreenshot(mFileName, 0);
    }

    //截图方式二
    // 根据一个Rect类型来截取指定范围的屏幕  
   private IEnumerator CaptureByRect(Rect mRect, string mFileName)
    {
        //等待渲染线程结束  
        yield return new WaitForEndOfFrame();
        //初始化Texture2D  
        Texture2D mTexture = new Texture2D((int)mRect.width, (int)mRect.height, TextureFormat.RGB24, false);
        //读取屏幕像素信息并存储为纹理数据  
        mTexture.ReadPixels(mRect, 0, 0);
        mTexture.Apply();

        //将图片信息编码为字节信息  
        byte[] bytes = mTexture.EncodeToPNG();
        //保存  
        System.IO.File.WriteAllBytes(mFileName, bytes);

     }

    //截图方式三
    //以某一camera截图
    private IEnumerator CaptureByCamera(Camera mCamera, Rect mRect, string mFileName)
    {
        yield return new WaitForEndOfFrame();

        //初始化RenderTexture  
        RenderTexture mRender = new RenderTexture((int)mRect.width, (int)mRect.height, 0);
        //设置相机的渲染目标  
        mCamera.targetTexture = mRender;
        //开始渲染  
        mCamera.Render();

        //激活渲染贴图读取信息  
        RenderTexture.active = mRender;

        Texture2D mTexture = new Texture2D((int)mRect.width, (int)mRect.height, TextureFormat.RGB24, false);
        //读取屏幕像素信息并存储为纹理数据  
        mTexture.ReadPixels(mRect, 0, 0);
        mTexture.Apply();

        //释放相机，销毁渲染贴图  
        mCamera.targetTexture = null;
        RenderTexture.active = null;
        GameObject.Destroy(mRender);
        byte[] bytes = mTexture.EncodeToPNG();
        System.IO.File.WriteAllBytes(mFileName, bytes);

    }