Well, I figured out I could just leave the wall untextured, and it works in ZDoom, but I'm worried this will cause compatibility issues or something with other ports. D:
you need to make a thin sector the length of the wall you want to have a 'sky box effect' on and then lower the cieling of the sector to the point you want the wall to cut off. The cieling of that sector should be F_SKY3 (If that name isn't completely correct then I just mean the bog standard sky flat).
Have a look at the outer wall of doom 2 MAP12 'the factory' to see what I mean.
This is a general editing question and hardly has anything to do with Doom Builder specifically. I'm moving this to the right forum, maybe you have more luck there.
Tell us or show us exactly what you mean. It would look strange to just have the ground end abruptly into nothingness, so theres usually a wall a few feet high before the sky starts.
01-16-10 05:21 
