I'm trying to make a very very long tunnel, and I get a critical error message when building the level.

CRITICAL ERROR
Block outside level boundaries!
Use -bound XXX to increase size!
Press any key...

I'm sure I surpassed some sort of limitation on my map size, but I have no clue how to "use -bound XXX" or anything like that.

I'm prompted to press any key, but I nothing happens when I do. I'm forced to abort the entire building of the level and abort it all.

Anybody have a solution for any of this?

Funny thing is, I can't google this problem, because "-bound XXX to increase size" gives me porn sites... yeah...

try to scale your tunnel down, so it won't look different, but it will be "smaller"
so you don't get this error message

you have to put -bound 100000 for example on the command-line of the build windows, it's at the bottom. Test with bigger values until you don't get that error

Generally: Make your Map as small as possible.
So for bigger worlds, you need a smaller scale.
You can increase the bounds, but maybe then you get problems with the clip plane. Smaller scale gives me usually a better framerate.


Source: http://www.conitec.net/beta/WED_Funktionen21-Map%20Building.htm