How Doom works in a nutshell:<p>- Every enclosed polygon has a ceiling height and a floor height<p>That&#x27;s it.<p>- The table in the middle of the room? It&#x27;s just a polygon with a higher floor. The room around it has a comparatively lower floor.<p>- A door is just a polygon with a ceiling height that matches the floor height. When you use the door, the ceiling raises. Combined with the textures being pinned, this makes the door seem like it&#x27;s going up.<p>Super simple. Also: play my wad, it&#x27;s awesome. I did most of the level design on my 386, my buddy stitched them together on his 486:<p>Screenshots:
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