Doom Engine code review.

Have you ever wondered how classic Doom renders a single frame? Then this is the site for you. Even if you are not a programmer or you are not into doom editing (to understand what a linedef or a sector is), this is still for you. You might enjoy the videos of the rendering of a single frame slowed down so that you can observe the order and see the effort it takes to render a single screen. It definitely makes me curious to download the source code of doom again and try to have a look at it for a second time.