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I think you're asking the wrong question. There's basically nothing to learn about UV channels, appart the fact, that each model can have multiple UV channels. What you should ask instead - how to access different UV channels in program X? And for that, google is your friend.
I am trying to widen the repertoire of programs X, Y and Z that I know at a cursory level. Which, as we all know are a lot more than 3. I am not a 3D designer, I hire them in Freelancer. They are specialists while, as their manager am a generalist.
If i had proceeded in the direction of your suggestion, I would had never discovered this jewel:
http://uvmapper.com/
Which, sadly is abandoned. :-(
Cheers!
-Ramon
"What you should ask instead - how to access different UV channels in program X?"
I am already asking that question.
- About 3ds Max, in the excellent forums provided by Autodesk. They kindly helped me.
- About Maya, in conversation with Alex Lashko, the author of a bulldog that I purchased in this website. His support has been extraordinary.
https://www.cgtrader.com/alexlashko
"And for that, google is your friend."
I think that CG Trader is my friend.