3D scans are Tri'ed and no topology flow so ya would need to re topology or ZRemesher them.

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Michel said David was all ready in the stone.
All Michel had to do was release David from the stone.

http://www.youtube.com/results?search_query=zbrush+rock+tutorial

The skill is in us all ,All we half to do is release the skill.

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The Artist that will fight for decades to conquer their media.
Even if you never know their name ,your know their Art.
Dark Sphere Mage Vengeance