Nurbs Sphere: How to have int & ext color?

[flyzone]

Hi all
I Have a little question:
I have a nurbs sphere and i want to color it:
- red at external
- blue at internal

How can i do this? I tried layered materials but...i don't know how to connect two different color into internal & external face of sphere..
In the poligonal sphere there is the "show normal" that make maya see the direction and then where to apply the 2 different colors....however i don't remember neither here how to do it .....
Someone could explain me that?

help will be appreciate,
Thanks

[joojaa]

Connect a samplerInfo.flippedNormal to a condition.firstTerm, then set the true color and false color. And connect this to your mterial. if you need different materials that too is possible.