So I recently wrote up some introductory Material Editor tutorials for Unreal 4:
http://www.tharlevfx.com/unreal-4-material-editor-math/
http://www.tharlevfx.com/unreal-4-uv-tricks/
http://www.tharlevfx.com/unreal-4-material-vectors/
http://www.tharlevfx.com/unreal-4-world-position-offset/
Nothing super complex but hopefully a good starting point for people just starting out or maybe just transitioning over to Unreal 4.
Crits and comments welcome and I hope people find them useful!
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I just found this thread and at first glimpse they seem really well done (I didn't have the time to read them yet).