Very nice find mate, could come in handy.
Just a qucky, for those who are interested in learning a bit more about PBR and what it is, as well as the "science" behind it, the company that created Substance Painter have a series of Substance Painter tutorials, and the second tutorial in the series is a great tutorial to learn all about PBR from, and can apply to any software, not just Substance Painter, i highly recommend watching it to get an idea of what you are getting into:
They also have a PDF guide to PBR that you can download from:
https://www.allegorithmic.com/pbr-guide
Just so you know, it looks like the method that Lee is implementing will be the specular/glossiness method, with the following naming convention:
_color
_normal
_gloss
_specular
_ao
_height
_detail
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