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Exporting MAT ID's from Max to Zbrush

Hello again everyone. I have done multiple searches on here to find the perfect answer to my question, but it does not seem like anyone has asked the right questions that I am thinking of. I found some good info, but nothing that quite answers me.

I have a model in MAX 2012. I then created Material IDs for certain parts of the model, because hell, it is easier to select polygons in MAX than it is to Mask and group by mask in ZBrush.

After, I unwrapped it to be seamless, or in other words, the seams are hidden pretty good. I did a pelt map to it.

I then exported selected to ZBrush as a .OBJ file.

In ZBrush I turned on in Preferences>Importexport>Import Polygroups and Import Mat as Groups.

When I click under Polygroups>Uv Groups My entire object is grouped, as if it is taking the one UV island as the grouping coordinates. Which I understand how that works.

Is there a way to keep the UV island I already made by pelt mapping it to be seamless, create Material IDs and import the object with those IDs as Polygroups.

Everything I have seen around does not go into if you already have a map made, but wants to you create a map, a map that has multiple UV islands for one mesh. I am the kind of guy that likes to create a single UV island for each object. If someone can give me good reasons to break my habbit…IE it does not mater in video games or movies if the UV islands are all one piece because I am painting in ZBrush anyway, that would be awesome. But I was trained on to make texturing easier, make the islands one piece so you can lay the texturing out easier.

Hope I did not confuse anyone, and thank you for all the feedback in advanced. I have been stuck on this model for far too long, thanks to having to work a full time job that is not ZBrush, but that is a different story for another time.

use Auto Groups with UV instead. This will break each UV island into a polygroup. Or, you can as you said, offset each island in MAX, which doesn’t effect anything other than the placement of them in the UVs.