I discovered all that on WBandD
very interesting ..
It remembers me all the years I spent on Duke Nukem Editor ,
then on UNreal , then trying to convert Unreal into vrml without succes LOL
But the guy succeed
one of my old complains about all that LOLhttp://closed.forumactif.com/3d-gallery-f26/halflife-unreal-etc-t2292.htm