"so basically remove or change everything that makes a teleporter work as a teleporter."

That seems to be what theyre getting at. "Can this be done in QuakeC?" was the basis of their question. 

But it isn't terribly much different than qc. I can't remember where I found the warpzonelib at or I'd paste a link.

BUT, you could do a similar QC version:
You could make the trigger silent.
You could make it teleport without the particle effect.
You could make the destination ever so slightly above the floor so the player doesn't get stuck.
You could make what is behind the opening/passageway look just like the destination, but you wouldn't be able to convolute spaces as well unless you used func_wall for the areas beyond, toggled them, and separated it so the player doesn't see the toggling. Good luck.

Side note: skip texturing one side of func_illusionary can lend to some confusing areas. 

http://quakeone.com/forum/quake-mod-releases/finished-works/10025-warpzones 

I played around with it a bit, here's a picture of a thin "viewscreen" looking thru to a fully rendered DM2:

https://media.discordapp.net/attachments/308578062126022658/397969864981217283/dp20180102232546-00.jpg 

worked for me, damage_inc 

I meant the "warpzone rar" inside the link does not work. You can't download it, says "Invalid or Deleted File". 

...nah... 

Is there any way to set a list of commands that are executed when maps are loaded rather than when Quake (Quakespasm in this case) is started? I prefer to disable fog but end up always having to open the console and enter "fog 0" on new levels or on loading a game. 

But you could throw something hideous in quake/id1/autoexec.cfg

alias +no_fog_forward "fog 0; +forward"
alias -no_fog_forward "fog 0; -forward"
bind UPARROW +no_fog_forward

So that every time you press the up arrow key it disables fog. 

For a single command, the aliases and +/- aren't necessary, you can just stick
bind <key> "fog 0"
and then press whatever key for the same effect once the map's loaded. 

Keybind is fairly convenient anyway, surprised there isn't an option to disable fog completely in-engine though. 

what is this place for? 

 

Welcome! 

Fog needs to be locked unless player does noclip. Make so that it toggles r_fullbright at the same time. It's either all or nothing imo. 

Why "lock" anything?

Anyway if you have the self control to not turn off the fog, it's simple enough to make it so that a single keybind turns on fullbright, noclip, fog 0, etc...

though restoring the fog value after you leave that "mode" would be awkward, if not impossible. 

Hardcode it into the engine that the player gibs if he tries tweaking any aspect of the visuals that go against the designer's intent.

Turns on blurry pixel mode? Gibby time for you mister...

"chuk-chun-chin-chi-chi-ngnol" 

Is it bad I have a keybind for noclip, notarget, godmode, fullbright on, and fullbright off? Mappers kit i guess 

 

Hardcode it into the engine that the player gibs if he tries tweaking any aspect of the visuals that go against the designer's intent.
I've heard stories of various Doom mods (wads?) that will kill the player or intentionally crash if they detect other mods being loaded at the same time, but having essentially zero experience with Doom modding I'm not sure how widespread/true they are. At least that's not a thing here, although a mod that does give a rude message when played in Darkplaces sounds like some cheeky fun.

Is it bad I have a keybind for noclip, notarget, godmode, fullbright on, and fullbright off? Mappers kit i guess
Nah, it's not bad until you have three copies of your \id1 folder named slightly different with identical contents other than the \maps folder so you can have one game for pure vanilla, one game to play downloaded maps, and one game to compile your own maps into.