I noticed this message appear after upgrading on all of my Overlay Canvases in my game.
**Unity shader channels Normal and Tangent are most often used with lighting, which an Overlay canvas does not support. It's likely these channels are not needed.**
I understand what the message is saying, and I've turned off all of the elements (selected `Nothing` -- see screenshot) and tested my game and don't see any issues, but I'm curious if anyone can tell me where I may find more docs on these? What are TexCoord1, TexCoord2, & TexCoord3? Any reason why would one be on by default?
![alt text][1]
[1]: /storage/temp/92187-screen-shot-2017-04-16-at-105739-pm.png
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