Expression driving transparency?

Date : Mon, 15 May 2006 13:09:07 -0400
To : XSI(at)Softimage.COM
From : Chris Johnson <chrisj(at)topix.com>
Subject : Expression driving transparency?
So I have 50 different animated rings but I want to have their transparency driven by there scaling. Scaling at different times and different speeds but when ever they get to a scale of 3 they're completely transparent. When they're at one they're opaque?

What's the best way to go about this. They obviously all need they're own local material?
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