[ohyes]

I'm definitely not knowledgeable enough in this area (old video game implementations), I was referring to the FPU on the 486 (386 didn't have one), it seemed to me that it might be a useful thing. Interesting it is all fixed point math in Doom.

[djsumdog]

The original Doom is super interesting in the design. You can't aim up or down because there is no up or down. You shoot at a guy at the top of a stair case and it will hit, because it's actually the same level. There's only one level. All the up/down perspectives are faked. In the original doom, you could never have a room above another room.