Thanks, guys.
Yes you did see the Quake logo, our engine is not self-capable yet.
I've been working on terrain rendering today and got some sloppy results. It's not functional yet, but not bad for a start, especially considering the fact I coded this feature entirely from scratch. Here's a screenshot - the black crap is the terrain, everywhere around it there's the hall of mirrors effect:

So far there seems to be no performance impact at all, even though the renderer is a brute force one (i.e. it does not try to reduce the triangle count).