I am not sure if it is bug or intended behavior. If it is bug I would like to see it fixed. When creating 3D floor slope by 3 points such that 2 point are below floor and one point is above floor then zdoom 4.6.0 (and 4.5.0 too) hides floor entirely but still renders walls.
Problem can be seen on following screenshot:
And here is the wad file:
When I lower entire surrounding floor by 8 such that more of 3d sloped floor is visible then zdoom renders it correctly
And wad file:
As can be seen from screenshot, doom renders wall longer than floor.
It looks like there is certain threshold from where rendering goes buggy. This also means that if I first create 3D floor slopes that are entirely above the floor and then raise the floor so that those 3D slopes partially shrink then some of those 3D slopes will "disappear". As a map maker I expect that when I raise floor below 3D slopes then the tip of iceberg stays visible as long as there is something that is above surrounding floor height.
This Also causes unexpected visual glitches in larger projects:
Where I am not able to make upward spiral that comes out of floor.
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