John carmack and Romero will tell you that doom is 3d.
Heretic which is idtech 1 has looking up and down and flying since day 1 which zdoom git that from.
I have worked on the doom engine before. I submitted patches to odamex in the past.
Doom always had a z-axis you can find in the linux doom port on id software git repo.
If you are talking about room over rooms and 3d floors that came from the build engine.
Zdoom had a version that could play duke3d
Not quite but close. Graf wasn’t working on gzdoom for a while and showed up just one day and push code to prod without the other devs knowing. Other devs found out it was LLM code and got upset and graf did graf shenanigans which was the ladt straw for the other devs and they forked it.
Feel free to fork the project under a
Heavily updated id tech engine
An game engine that happens to play classic doom.
Little late to this but I have played this game. My computer couldn’t play it so I ended up playing with 12fps with bots. I got it off of real arcade back in the day.