I THINK I understand. Thanks Alex!
Richard, sorry I know it’s my cranky english: beiieve me it’s hard sometimes to explain even simple things.
I’ll make an example. Say you want to style some hair and beard. You can do it using only one shave group, and voilà, export it as a unique .obj.
But what if you’d like the beard, for example, have different hair widths than the hair, or use a different density map, shader etc.? Well, then you need to create a second shave group, and that will imply that upon exporting, you’ll have 2 obj’s, one for the the first shave group (hair), one for the second (the beard).
Anyway if you like to use those ZBrush, you can easily append as many .obj’s as you like in the same ZB subtool…