At the bottom of the material palette, there’s a list of “material channel descriptors” just under the texture selector. What are these for? They don’t seem to do anything.
Sorry for bumping this old post.
I stranded to this thread from google search.
I put down this reply from official, for same people.
“”
The Material “Channel Descriptors” don’t do anything. I think it is probably a feature that was never completed but as they are they serve no useful purpose.
“”
He said also, “I’ll try and get them removed which would be sensible!”
so, it may be deleted.