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New Cheat Code Discovered in Sega Saturn Doom After 27 Years
(www.retronews.com)
Vintage gaming community.
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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