I recently wrote a simple 4 shader terrain shader...nothing special..I practically copied it but added the black channel by subtracting the other mix channels and adding a detail texture by subtracting it by a small value.
The issue is I'm no shader guru..at all..I have no clue how to push a result to the NORMAL and compute the lighting...I do not know all the mix techniques also...like add, multiply etc..or if they need to be written.
Can anyone point me to a simple document that can tell me these things so I can work it out?
I looked at the godot docs...they are less than helpful...clearly written by veteran programmers :)..so if you are new to anything..they are like figuring out ancient egyptian algebra...using hieroglyphs.