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New Cheat Code Discovered in Sega Saturn Doom After 27 Years
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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