I vaguely recall someone recently complained about two-sided materials (curtains?) not getting lighting from both sides
I just found a piece of code that's supposed to do just that
Where was that discussed? (@nbohr1more?)
I still play classic Doom (albeit with user-made mods and maps rather than the original campaign) on a regular basis. A game from the early 90's which has still got a healthy following in 2022. Pretty amazing.