I’ve noticed a bug, or I think it’s a bug, but I need confirmation.
If you create a node material and you add a driver to a mix color node(for example), the property will be marked as driver but it won’t appear in the Graph Editor/Drivers. So it can not be used.
I’d like to know if this is a bug or a not-yet-implemented-feature.
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http://www.anigoanimation.com/files/bug-material-node-driver.blend