4 ms·Doom doesn't have arbitrary normals; wasn't that from Quake?by ygra 7y agoDoom doesn't have arbitrary normals; wasn't that from Quake?smcl 7y agoQuake III Arena, iircacoye 7y agoYou are correct. I was running low on caffeine . https://en.wikipedia.org/wiki/Fast_inverse_square_root https://en.wikipedia.org/wiki/Fast_inverse_square_root