Perfect! Thanks, Dan!

I swear I've seen this before, but can't find it anywhere... I'm trying to figure out the code to make a layer's opacity change from 100 to 0 the moment we see it's back instead of it's front. So if I were spinning a layer, it would hide itself at the moment where it has turned 90 degrees to the cam...

A minor bug: the script doesn't add a '\' before an exclamation point in a file or folder name. The renderer couldn't find the file until I went into the terminal and changed all '!' to '\!' manually. cheers.
(OS X 10.4.7, AE 7.0)