I know that Quake (the 1996 MS-DOS game) is a "full" 3D engine, and always had some kind of mouse support.
However, even the original Wolfenstein 3D from 1992 also had mouse support from the get-go, only it was of course not "look up/down" mouse support. Same thing with the DOOM games which came after Wolfenstein and before Quake (1993-1995). They allowed you to use a mouse to move, but not look up/down, because they were not "true" 3D engines. But Quake was.
Yesterday, I watched a live stream of somebody playing Quake. It was apparently on a modern computer, but in a very faithful-looking manner. For example, it was rendered in software mode, and everything looked very similar to how I remember it. He had trouble playing it because he had to use keyboard keys to look up/down, even though he used the mouse for looking to the sides and fire the gun. I was shocked by this and asked him to go into the menu. And, lo and behold, there was no freelook option anywhere! "Lookspring" seemed like it could be it, but it was not. The menu system did not have an option to enable "full"/"free" mouselook. That is, look up/down with the mouse.
I searched the 'net while he was playing and found a forum past saying that all Quake 1 engines/ports ever since the very first version for MS-DOS had so-called freelook support, but that some of them lacked a menu option for this for some bizarre reason. It went on to mention that, if such is the case, you have to go to the Quake console and type
+mlook. So I asked the streamer to do so. And he did.
It worked. After that command was typed, he suddenly had full freelook support, and was able to look up and down with the mouse!
Now I wonder:
- Since Quake 1 was a full-3D polygon engine right from day one, and mouse support existed also since day one, why would id Software not have made this enabled by default to literally "free" the player and show off their fantastic new engine?
- Why would any Quake 1 version/port not have this as a menu item in options, but rather hidden away in the cryptic console?
Even though I remember playing Quake 1 with the keyboard only when it was new, probably mostly due to general MS-DOS mouse issues, I associate that game with free mouselook since it was the first FPS to be in full "real 3D" and thus would have every reason to "brag" about this fact by letting the player look around freely with the mouse.