Note. This article was originally published at the AltDevBlogADay site. But unfortunately the site ceased to exist. For more than a year, the article has been unavailable to readers. We contacted John Carmack and asked him if he minded us publishing that article at our site. He didn't and now we are glad to do this. To see the original article, use Wayback Machine - Internet Archive:
http://web.archive.org/web/20120422160515/http://altdevbloga...