Hi z-people,
Here is a brief tutorial that shows how to do a quick and good Matcap using a rendered image.
First I created a sphere in XSI, then I rendered the sphere with my shaders.
I made the sphere into XSI so when I use Matcap tool in ZB I can to leave same Matcap markers and I do not need to change position of them.
I have just to change the render of the sphere and store a new mat, just clicking on one of them ;).
Sorry for my bad English and I hope that it will be useful.
Enjoy!