I'm not a 3D artist. And I have no idea how these artists are able to map a texture onto 3D geometry exactly how they want it to be. (Of course I know, but I am too stupid to get it look good). So I just added a new feature to my
irrEdit development version.
Ah, that was easy. 10 lines of code. No fiddling with some external 3D software where I am to stupid to find the feature I need. :)