With John Carmack at the problem, this is definitely something I'll be keeping a close eye on. For people that are unaware, he's one of the original creators of Doom, and his innovations in computer graphics are legendary.
And how old you are (ducks) But seriously it's 2018! It's the distant future where Doom is run in emulators in browser windows.
Namely, that when he created Wolfenstein 3D (Doom’s predecessor), he basically only rendered the walls + sprites and not the floor or ceiling, because computers + graphics engines weren’t as capable at the time.
It was influential enough that for many years, the genre we now call “first person shooters” was known as “Doom clones”.