On: Build Your Own Flight Sim in C++ (1996)

[myth_drannon]

Actually the author - Christopher Lampton, has an earlier book just on the topic of this games style. It's called "Gardens of Imagination, Programming 3d maze games" https://archive.org/details/gardensofimagina00lamp

[ArtWomb → myth_drannon]

Ultima Underworld - The Stygian Abyss from 1992 enjoy ;)

https://archive.org/details/msdos_Ultima_Underworld_-_The_St...

[livrem → ArtWomb]

Or pay $2 for a legal copy (and get Ultima Underworld 2 included as well): https://www.gog.com/en/game/ultima_underworld_1_2

[mysterydip → myth_drannon]

I have both and they've been great resources. I had been wondering for a long time how to add arbitrary height to a raycasting engine, and that book finally showed me how.