Thanks for that. What height value does rust usually have? As in, does it collect on top of an unprotected surface or does it eat into the surface itself?
I would say, search for reference images of rusted objects similar to the one you are working on. Generally speaking rust happens evenly on unprotected iron surfaces exposed to moisture. So the rust pattern depends on - how does any protective layer on the metal looks like (e.g. scratches on paint, chipping paint, ...) -…