The best way? Painting them manually. This is the best way.
But it is also possible to generate the maps out of diffuse map by setting up the levels and saturation ... but this isnt recommended.
They are already many threads out there with this topic.
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But it is also possible to generate the maps out of diffuse map by setting up the levels and saturation ... but this isnt recommended.
They are already many threads out there with this topic.