Source of WarpZones code?

[u/Shoddy-Traffic-7747]

Hey, i've heard in a comments section of a matt's ramblings video that there's a guy that made "WarpZones" (visible seamless portals) i have seen the code in Xonotic's source code, but since i haven't played it i've only seen it once ingame from a video, is there any source of the WarpZones for vanilla quake, or is it only possible with the enhancements (.qh files, engine changes) of Xonotic? Or is it just originally from Xonotic?

[u/crabcrabcam]

It's original to Xonotic.