Unity/3d/回転

transform.localRotation = new Vector3(0, 0.5f, 0); //こちらでなく
transform.localRotation = new Quaternion(0, 0.5f, 0, 0); // こちらでもなく(x, y, z, w)
transform.localRotation = Quaternion.Euler(0, 0, 180f);// こちらを(x, y, z) 0 ~ 360fまで

参考：https://spi8823.hatenablog.com/entry/2015/05/31/025903