Unity3D编写脚本从屏幕截取一个子区域保存为Texture2D，用于保存图片和当贴图都可以

GameObject UserCutBox;  // 用于描述截取范围
Texture2D fullscreenCapture ;
Texture2D subarea;
void Start()
    {
        rcttrans = GameObject.Find("UserCutBox").GetComponent();
    }

// 开始j截取屏幕（全屏）
public void startSnapShotFullScreen()
    {
        StartCoroutine(CaptureFullScreenData(OnCaptureFullEnd));
    }

private IEnumerator CaptureFullScreenData(Action