Not sure if my head is just full of sleep, or it's because I've still yet to make them for myself, but I'm struggling to process how you'd go about setting up smaller maps similar to the Micro Detail Normal maps for skin pores etc. This was discussed a bit in another thread of mine, but I don't think the exact workflow was covered.
For instance, I've downloaded a model of Dr Robotnik (Eggman - though he'll always be Robotnik to me) from Sonic Unleashed, which I plan on including in a render or two once my project for making the Death Egg Robot is finished. My sketchbook with that can be found here: https://polycount.com/discussion/232465/sketchbook-tim-smith#latest
Like other models I've examined, it includes additional maps like Specular and Reflectivity that are smaller than the base maps. The base maps are 512x512, but these smaller maps are 128x128, or 256x256.
What's the exact workflow for setting these up again? What's the common process? Do you just add them like you normally would, either painting them manually...? Extracting them from other texture bakes...? And then export them out at a lower resolution...? Or if it's just for a specific area, like on the torso, do you crop it so it's just that area, and then export and apply that?