Hi Mackey.
I’m using the code posted here PBR texture splatting (up to 64 textures). As i said, i don’t understand shader code. I can’t help you understand how it works, because i don’t understand it either.
Strange nobody in this forum is able to explain it, there’re many skilled people here.
Maybe we’ll get more luck if we ask on unity forum.
If you need help testing, i’m available.