TheAntropus shows a quick and reliable way to create cavity maps on your own.

So you have a large amount of UDIMs and an insanely detailed model. It would be best to generate cavity maps, but Zbrush’s maps exporter has let you down in the past. This new tutorial from Kris Costa (Antropus) offers some insights into his method to craft cavity maps on your own.

Costa’s technique involves a little Photoshop work that you can automate into a simple action.