Lit sphere Material is one of the most over looked feature in mudbox 2009.
This tutorial is aimed to shed some light on how to use it properly within Mudbox.
The 2 main things one need to remember when using such Shader
A- Align the light with the camera
B- Make the sphere slightly bigger than its container
http://www.pixelcg.com/blog/?p=148
I’ve psoted this a while back on the AREA
hoping more people can use this shader