Cross-portal sector bleeding.

[RockstarRaccoon]

Thanks for the explanations, folks. It really was meant as more of a tech demo than an actual practical case thing. I was half-hoping that it could take off and be a fairly common niche mapping trick, but if it's that unoptimized, then it's probably best that it isn't used that often, if at all.

It's a thing I've seen people do, and it apparently works if you don't stand on top of it and look at the sides, but with software support for models coming up, and zscript, I just don't see the point of this...