Egregoros

and now I've got to go drink from this urinal

Duke Nukem 3d was a masterpiece.
Especially since (as I recall) it was implemented in a single-level Wolfenstein engine, and multi-level was entirely a hack.

@cjd security cameras and mirrors are way to complicated to do in the modern error (was going to say era but typoed and it works)

@thatguyoverthere They did this by physically cloning that part of level geometry visible into the mirror with a special sector definition, which also adds adding moving sprites with no ai that would mirror what was happening in the real sectors

Brute force, but functional. Now notice how there's never any bathroom mirror in the likes of anything Bethesda made...

@cjd @thatguyoverthere yeah it’s obvious when you have the map open when you’re going up or down stairs, at a certain point you you get seemlessly teleported to the proper floor.