Hi, I would like to know if you can replace or update a subtool because unfortunately I got these black spots and I think it’s due to me not realising I had left an ngon on my model in maya. It’s a pretty easy fix and I wouldn’t want to start sculpting on my model again since I’ve done quite a bit of it and plan to take it into substance painter, by the way I’m kinda new to zbrush so if this is easy to do I apologise lol. Thank you
Hello @Rotuma2014
Be sure to update your program! You’re missing quite a few fixes and more than a couple great new features.
These look like holes in your mesh. If that is the case, then holes can be closed with the Tool > Geometry> Modify Topology > Close Holes function. If your mesh is low-ish poly, they can also be closed with a number of ZModeler functions like Edge> Close, or using the Bridge functions to draw new polygons manually.
Running the mesh through Dynamesh would also auto close any holes, but this will also alter your topology.
However, there are some other things to consider. If you have subdivision levels, in order to make changes to the base level topology you would have to first freeze the subdivision levels.
Also mind that polygons with greater than 4 verts cannot exist at any time in ZBrush. This means that ZBrush may insert extra edges to force quads and tris in auto-close operations that would need to be manually cleaned up if you were attached to a certain topology flow. Also, the auto close functions do only that–they close the mesh in the most direct way possible. They do not respect topology flow or form. This might require re-meshing or manual mesh editing, and would be much easier to do at lower poly counts.
Yes, if you’d prefer to edit your mesh outside of ZBrush, you can simply re-import the updated tool over top of the existing subtool. Select the target subtool, and use the Tool > import function to import the new mesh. It will replace the existing subtool with the import.
Good luck! 
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