So I saw Pior's cool video cap on Mudbox' litspheres here: http://www.vimeo.com/7916648
..it's a pretty intuitive concept but I hadn't seen this type of shader in action yet, nor did I know it was part of Mudbox and Z (was still working with Mud1 until recently).
My friend Charles Hollemeersch wrote a slim viewport shader for Max that does the same thing, it's only got 2 image inputs (normalmap + litsphere) and works for highpoly stuff as well as normal mapped lowpolies. Oh, and it's named Matballz. Download below.
Anyway, I think it'd be nice to have a thread where people can share their litspheres/matcaps (ideally with a preview image, similar to the PS brushes thread). Here's a couple I've been making.
> Download Max shader + ballz
Quick now, post your own!