there is a thread on polycount
http://www.polycount.com/forum/showthread.php?t=121144
make sure you go to the last a few pages which contain some useful info on how they did it and of course dont expect some magic shaders of doing it.
there is a thread on polycount
http://www.polycount.com/forum/showthread.php?t=121144
make sure you go to the last a few pages which contain some useful info on how they did it and of course dont expect some magic shaders of doing it.