I use zbrush polypaint for painting skin for my low poly game character .. I just wanna ask how could I get a specular map inside zbrush or by using the diffuse map ? I heard they used zbrush polypaint for making farcry 4 and assassin's creed black flag skin.
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you can't without painting it as a separate polypaint file or subtool. for specular that's kinda redundant now with PBR workflows as skin has a constant value.
also:
Pfft, will get you ignored in the future real fast.