This shader utilizes RGB Texture channels to defines masks. You can control the colour, gloss, intensity of each channel. The mask is based off the models 2nd UV channel.
The shader can be used to add a lot of variation to your models, as well as dynamically changing the look.
Feel free to throw some $ at this, as it will help support me in creating more custom shaders that will benefit artists.
Example of shader in use - https://www.youtube.com/watch?v=WCXyZa0UqJU
Portfolio - https://www.artstation.com/codyalday
Email if any issues - firstname.lastname@example.org
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