this post was submitted on 10 Sep 2024
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Just from the screenshots in the tweet/article:
I would argue that is less transparency and more overlaying the skybox texture. In the city map with the Pinky you can't actually see anything behind that wall, you just see the skybox.
Could just be "bad" examples but this makes sense. My understanding is that PC DOOM tended to use additive geometry in these cases so that the skybox is literally just a bigass box around the map. Whereas I assume the Saturn version had to do some magic to fit everything and may have used a different technique. Hence the ability to just overlay that texture over everything.
IIRC Doom didn't have a skybox per se, just parallax ceiling textures. You could put that texture on floors or ceilings and it would show the sky texture that would not be attached to the walls.
The texture was definitely funky and I want to say was used as the ground portal in a lot of Ep3 levels.
But I THINK that was still applied to a giant box on the edges of the map. Which is how a lot of games still do that.
As an old school doom mapper from the 90s, it absolutely isn't. You build a room, apply F_SKY1 to the ceiling, and that's it. The engine renders it more like a wall, but it's not a traditional skybox in that it doesn't exist in the level geometry outside of the room it's applied to.
https://doomwiki.org/wiki/Sky