by Le another black niger » Oct 4th, '16, 7:18 pm
Some sort of this is in my wishlist too, but i'm not such a big mathematician/coder to get it quickly.
Radiant supports 'brush primitives' format, which has possibilities, equal to 220 one (but not supported by tyrutils-ericw, according to docs)(but is easy to add-)
Anyway, no much texturing tools in radiant right now; switching formats is basically toggling axial/face projection atm...
There is disabled uv editor, btw; requires investigation.
I'v also had short testing in HL game mode: there are 220 format reader and writer, just no internal support of texturing, as far, as i'v got.