https://www.avdlog.com/batch-rendering%ef%bc%88%e3%83%af%e3%83%b3%e3%82%af%e3%83%aa%e3%83%83%e3%82%af%e3%81%a7%e9%80%a3%e7%b6%9a%e3%81%97%e3%81%a6%e3%83%ac%e3%83%b3%e3%83%80%e3%83%aa%e3%83%b3%e3%82%b0%e3%81%99%e3%82%8b/