Horizon Linedef Special in software?

[ChopBlock223]

Having just woken up and seen a conversation regarding a Boom/MBF21 map where a huge area had to be trimmed down for causing problems, I got reminded of that really cool Horizon linedef special in ZDoom ports.

 

What it does is simple, it renders not a wall on this surface, but instead renders the floor and ceiling so that they continue together into a vanishing point to create a horizon, regardless of what the physical areas in question are. You can see this effect employed in ZDoom maps dating back relatively far, I remember some of the maps which came with Skulltag using this effect, and remember thinking it was a super nifty feature at the time.

 

I think that this can be done in software rendering (correct me if I'm wrong, but I think I played said maps in software mode), and I think that this is something which could be useful in a practical sense for like MBF21 mappers. Both for making a visual of a horizon in times where making massive physical sectors could be impractical or cause problems, as well as a number of simple but interesting visual special effects one could create with animated flats, scrolling, and pulsing lights, as well as illusions, where actual playable area is revealed to be behind something like it.

 

Anyone else think a feature like this would be a cool and helpful addition if there's ever like an MBF23 or MBF24 format devised some day?