Hello guys.

What is the correct way to change materials during rendering? What callbacks 
should I use, update callback?
Sometimes I get a crash and I assume it is becasue of changing the material.

Should I use special updateCallback on every geode/geometry I am changing, or 
it is enough to use the callback on a parent and change the state attributes 
also on children?

Should the data variance be DYNAMIC on these nodes?

Thank you!

Cheers,
Peter

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