Hello, I try to create the texture of a compact disk with the diffraction shader of Maya. It's a specialised shader that can be used to create realistic diffraction effects like the rainbow reflections created by a CD. But when I apply this shader on my disk all the "rainbow" go in the same direction.

I have this:


But I want that:


I don't know how to proceed! If somebody knows this plugin and could explain to me...

If you want to test this plugin I put it here (for Maya 4.5).
For Maya 5 you can find the diffraction shader in the bonus tools 5
on the web sit of alias

Thanks a lot