Agree with leather-guy.. You put 'shader' or anything technical sounding in the title, you lose 90% of the audience right there :)

Plus it is for apollo, which is a) not a big boobed female and b) not named v1/2/3/4 or M1/2/3. That takes care of the other 90% :p

Seriously though... thanks a lot for sharing, i'm sure it will come in handy !