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New to ZBrush, need help Dynameshing imported file

ZBrush Usage Questions
#1

Hello, I made a castle tower in Rhinocerous 5, then imported it as a .obj file into ZBrush. I was aiming to have the precise dimensions of Rhino, but then making a craggly stone surface with the ZBrush sculpting tools, and then 3D printing it.

But when I imported it, the Dynamesh ‘fills holes’, and fills in the little windows and the large central cavity. I messed with the Dynamesh settings and nothing changed the hole-filling. I also tried to ‘quadrate?’ the mesh in Rhino 5, but the resulting quadrangles (and the previous triangles) are super duper stretched out, and ZBrush doesn’t like stretched out polygons.

Any suggestions of how to prevent or somehow remove the filled-holes in ZBrush? The filled parts seem to be a different color, so maybe that’s a cue of a subtool or something? Though it doesn’t show any subtools in that palette.

Thank you very much any help in launching my ZBrush experience!

Attachments

TowerDynameshed.JPG
TowerDynameshed.JPG1600×900 149 KB

TowerImported.JPG
TowerImported.JPG1600×900 122 KB

#2

Don’t think you need close holes.

#3

I don’t think you need to use Dynamesh for this job. After import, use ZRemesher to get a uniform mesh distribution then subdivide to get enough geometry for your sculpting. Dynamesh is for making large changes to your mesh and you already have your base form.

#4

Thank you very much, I will give that a try…

#5

Set the Dynamesh Close Holes slider to 0 and it won’t close holes.

#6

Oh, I didn’t notice that slider. I’ll try that too. Here’s what it did with the ZRemesher and Subdividing. Weird wild dissolved looking tower.

Attachments

CastleTowerZremeshedSubdivided.JPG

#7

I don’t appear to have a Dynamesh Close Holes slider. I have ZBrush 4R6, is the Close Holes Slider in 4R7?