>>4167206
pretty sure that's because of zdoom coding it in. The only acceletarion in vanilla doom is downwards to simulate gravity
>>4167218
marathon their own 2.5d vector physics engines and rotts used an a modified version of wolf3d engine. Wolfenstein 3D already XZY angles and vector physics but had even less features because it was designed in 1990 hardware. I'm certain they understood what the DOOM engine allowed for and built their games with it in mind.
They could not solve the rendering problem, but had several years worth of hardware upgrades that allowed them to add extra features and not slow their games to a crawl. So they made couple Z level features to their games. They could have used that time and effort to polish their games desu
The question would be which game began development first. Let me check... aaand here it is.
As the game was getting into deeper development, project leader Scott Miller was contacted by John Romero, informing Miller that the project had been cancelled. Miller suspected that this was because id Software did not want to draw the spotlight away from their upcoming game, Doom.[4] In order to keep as many of the numerous game assets the team had already created from going to waste, Tom Hall came up with a new storyline which still incorporated the Nazi themes seen in the Wolfenstein series.[4]
Here you have it boys. Marathon began development in reaction to DOOM, while rise of the triad was already in development since at least the release of Wolfenstein 3D.
Therefore, The first game to implement rocket jumping into their game was Rise of the Triad.
>>4167276
There is not "horizontal dimention" in doom engine. there's a R2 vector that governs movement, that had the potential to be an R3 vector because the engine was design around XYZ axii