Hi there akhromov,
I’m in the process of writing shaders and a tutorial on how to use them in Maya, mentalRay and renderman.
That said, the development of shaders is the most difficult aspect of this technique.
This tutorial will be printed in an upcoming issue of Highend Magazine, which is actually a follow-up the the article I’ve already written on this technique (due out in a few weeks when Issue 3 of the magazine ships).
Regards,
Zendoftheworld…