Add a thickness to the mesh with subdivision history.Installation
Put the file ExtrudeKeepSubdiv.zsc into Program Files\Pixologic\ZBrush 20XX\ZStartup\ZPlugs64 and restart Zbrush.
For personal use and one commercial project (up to 2,000 sales or 20,000 views).
One copy to be used by a single user.
One installation by a single user.
For use on an unlimited number of commercial projects with no limits on sales or views.