My first real maps were for a mod called Tempus Irae, for Marathon, a Doom-like game for the Mac back in 1997. (Crap I am old.)
There's no screenshots around but a friend extracted the geometry of all the levels from the mod and rendered them as transparent objects... still look pretty cool:
screenshot from that last one:
There's no screenshots around but a friend extracted the geometry of all the levels from the mod and rendered them as transparent objects... still look pretty cool:



screenshot from that last one:
