What is roughness map guys, after some googling I think it’s like a specular map but it’s not, so what are the differences? I can’t find an exact document page for it
From what I understand its like Spec + Gloss… Rocks are rough, glass isnt.
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thanks how we can create one? Can I invert the specular map to get Roughness map?
Best info I’ve found is here https://www.allegorithmic.com/pbr-guide
Roughness is detailed in volume 2, page 10.
In Unity roughness is defined in the alpha of the metalness map. Please correct if I’m mistaken.
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Detailed read on the PBR maps - including roughness
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thank you for the Links ANMATOR and Autakis 
now i get it