[won't change] 3D sloped floor texture bug

[J-Dub]

In this wad, the top textures of the two left 3d floors are missing and the bottom textures of the two right floors are missing

[Graf Zahl]

This violates an important rule of 3D floors: They must not intersect with each other or the real floor or ceiling. The floors don't get drawn because at the reference point (the sector's center) they are above the ceiling or below the floor.

I can't fix this without adding a considerable amount of inefficiency to the engine so I won't bother.