Unity三种截图方法

引用出处：
[1]http://blog.youkuaiyun.com/highning0007/article/details/37991787 Unity3d之截图方法

    /*
    *方法一，截取某一帧的整个游戏画面
    *a.不能针对某一个相机（camera）的画面，进行截图。
    *b.局部画面截图不方便，效率也低，不建议在项目中使用
    */
    Application.CaptureScreenshot("screenShot.jpg", 0);

    //方法二，全屏截图
    //Rect：截图的区域，左下角为o点
    //截全屏：
    CaptureScreenshot2( new Rect( Screen.width*0f, Screen.height*0f, Screen.width*1f, Screen.height*1f)); 

    //截中间，1/4:
    CaptureScreenshot2( new Rect( Screen.width*0.25f, Screen.height*0.25f, Screen.width*0.5f, Screen.height*0.5f));

    Texture2D CaptureScreenshot2(Rect rect) 
    {
        // 先创建一个的空纹理，大小可根据实现需要来设置
        Texture2D screenShot = new Texture2D((int)rect.width, (int)rect.height, TextureFormat.RGB24,false);
        // 读取屏幕像素信息并存储为纹理数据，
        screenShot.ReadPixels(rect, 0, 0，false);
        screenShot.Apply();

        // 将这些纹理数据组成一个png/JPG图片文件
        //byte[] bytes = screenShot.EncodeToJPG();
        byte[] bytes = screenShot.EncodeToPNG();

        //string filename = Application.dataPath + "/Screenshot.jpg";

        System.IO.File.WriteAllBytes(filename, bytes);
        Debug.Log(string.Format("截屏: " + filename));

        //返回Texture2d对象，可以用直接赋值给Texture2d类型的变量，方便且节省资源      
        return screenShot;
    }

    //方法三：截取某个相机渲染的画面
    Texture2D CaptureCamera()
    {
        //创建一个RenderTexture对象
        RenderTexture texture = new RenderTexture(Screen.width, Screen.height, 0);
        //临时设置相关相机的targetTexture为RenderTexture的对象，并手动渲染相关相机
        renderCamera.targetTexture = texture;
        renderCamera.Render();
        //激活RenderTexture对象，并从中读取像素
        RenderTexture.active = texture;

        screenShot = new Texture2D(Screen.width, Screen.height, TextureFormat.RGB24, false);
        screenShot.ReadPixels(new Rect(0, 0, Screen.width, Screen.height), 0, 0);
        screenShot.Apply();

        //重置相关参数，以camera能继续在屏幕上显示
        renderCamera.targetTexture = null;
        RenderTexture.active = null;
        Destroy(texture);
        //将这些纹理数据转换为byte
        byte[] bytes = screenShot.EncodeToJPG();

        //将纹理数据组成JPG图片文件
        string fileName = Application.dataPath + "/Screenshot.jpg";
        return screenShot; 
     }