Original DOOM and DOOM II game engines were 2.5 D.
You could not look up and down or jump.
That is not to say that there was no z-axis in the maps themselves, but the game engine handled it in a simplified, flattened way.
Its been a really, really long time since Quake z-axis code was backported to create zDOOM.
You are a great example of people not realizing this.
Original DOOM and DOOM II game engines were 2.5 D.
You could not look up and down or jump.
That is not to say that there was no z-axis in the maps themselves, but the game engine handled it in a simplified, flattened way.
Its been a really, really long time since Quake z-axis code was backported to create zDOOM.
You are a great example of people not realizing this.
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.
Child. What do you think zDOOM is? Get a clue.
https://en.wikipedia.org/wiki/2.5D