https://blog.faceutil.com/2017/03/31/%eb%91%a0-2016-doom-2016-v1-0-1-%ed%94%84%eb%a1%9c%eb%aa%a8-%eb%b2%84%ec%a0%84-%ed%8a%b8%eb%a0%88%ec%9d%b4%eb%84%88-%ce%b2/