: Avoiding slow floating-point calculations, which was critical for the CPUs of that era.
If you are looking for a deep dive into the code and architecture, the provides a comprehensive breakdown of the engine's internal logic, while Fabien Sanglard's Game Engine Black Book: DOOM is widely considered the ultimate "paper" or book on how the technical magic of DOOM was achieved. DOOM.part08.rar
The most famous "interesting paper" related to this topic is: Why it’s "Interesting" : Optimizing how floors and
(often discussed in the context of Bruce Naylor's work or the early id Software technical blogs). Why it’s "Interesting" : Avoiding slow floating-point calculations
: Optimizing how floors and ceilings were rendered to save processing power.
However, given the context of DOOM and "interesting papers," you are likely looking for the landmark research on the and its revolutionary use of Binary Space Partitioning (BSP) .