That's because they tapped into the mental ray shader ball mechanism.
I know mental ray v1.x had shaderballs because I used to hack the shader
cus files in SI3D to expose them on certain shaders - didn't always work
though. I can't remember if the shaderballs were discontinued with mental
ray v2.x or v3.x. I only remember it happened when mental ray did one of
it's core architecture overhauls.
Matt
----------------------------
Matt Lind
Animator / Technical Director
Softimage certified instructor:
Softimage|3D
Softimage|XSI
Matt(at)Mantom.net
Date : Tue, 4 Jul 2006 07:21:21 +0100
To : XSI(at)Softimage.COM>