I know there is InsertMesh and subtract with DynaMesh and Reprojection but that is all too imprecise for my taste, here is what I mean:
I tried to split them: First sub Dynamesh on the right side with a simple insert mesh box, then sub Dynamesh on the left side with a simple box and the mesh previously duplicated. I made that very precise yet I get this very imprecise, jaggy and distorted edge. I could up the resolution but it will be still a problem.
I like to to use it mainly for 3D printing stuff in parts, I know the prints will far from precise but with that rough split it would make it even worse to glue things back together. I could use 3DsMax boolean but since that is tricky, crash happy and can take ages with high poly meshes I would rather not do that.
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Right and then cap holes, that should be the best way to do that. Still would be great to be able to do proper boolean in Zbrush.
http://docs.pixologic.com/reference-guide/tool/polymesh/polygroups/
That looks great! Should be then the best for slice cuts.
Still boolean subtraction would be nice to have, for instance for making perfect eye sockets so I can print the eyes separately and put them in. Dynamesh sub would work but also smooth out that whole model again.