Unity：截图

三种截图方式：

　　1. 引擎自带的截图方法

　　2. 矩形截图

　　3. 相机截图

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1. 引擎自带方法： ScreenCapture.CaptureScreenshot(“SavePath”);

2. 矩形截图：

private IEnumerator CaptureByRect(string fileName,Rect rect)
    {
        yield return new WaitForEndOfFrame();  //等当前帧渲染完了再截图
        Texture2D mTexture = new Texture2D((int)rect.width, (int)rect.height,TextureFormat.RGB24,false);
        mTexture.ReadPixels(rect, 0, 0);
        mTexture.Apply();
        byte[] bytes = mTexture.EncodeToPNG();
        System.IO.File.WriteAllBytes(fileName, bytes);
    }

2.5 拓展：截取鼠标选取的矩形区域

private void Update()
    {

        if (Input.GetMouseButtonDown(0))
        {
            start = Input.mousePosition;
        }
        if (Input.GetMouseButtonUp(0))
        {
            end = Input.mousePosition;

            Vector2 leftBottom = new Vector2(Mathf.Min(start.x, end.x), Mathf.Min(start.y, end.y));
            rect = new Rect(leftBottom.x, leftBottom.y, Mathf.Abs(end.x - start.x), Mathf.Abs(end.y - start.y));
            StartCoroutine(CaptureByRect(GetFilePath(), rect));
        }
    }

3. 相机截图

private IEnumerator CaptureByCamera(Camera mCamera,Rect mRect,string fileName)
    {
        yield return new WaitForEndOfFrame();
        RenderTexture mRender = new RenderTexture((int)mRect.width, (int)mRect.height, 0);
        mCamera.targetTexture = mRender;  //给相机新建一个RenderTexture
        mCamera.Render();  //渲染一次相机
        RenderTexture.active = mRender;   //激活RenderTexture
        Texture2D mTexture = new Texture2D((int)rect.width, (int)rect.height, TextureFormat.RGB24, false);
        mTexture.ReadPixels(rect, 0, 0);
        mTexture.Apply();
        mCamera.targetTexture = null;
        Destroy(mRender);
        byte[] bytes = mTexture.EncodeToPNG();
        System.IO.File.WriteAllBytes(fileName, bytes);
    }