/vr/ - Retro Games

>>5004759
You toggle it at the start prompt where you select your iwad.
What it does, is that it's sort of a 'map' for various sprites and textures, highlighting specific areas on them, which tells the game that these specific parts of the sprites and textures render brighter than the rest of it.

So, for example, a lamp will be fully bright in a dark room, or the eyes of imps will be visible even if it's super dark and it's hard to see the rest of them, so it looks a bit like their eyes are glowing, the same for a few wall textures with 'glowy' eyes like that.
It's a bunch of subtle effects, but it looks quite good and doesn't look horribly out of place with the original graphics.

Pic related, you can kind of see it on the pinkie that killed me here. Caco's big mouths also light up a bunch when firing off ball lightning.