ZBrushCentral

Screwed Up Mesh on Save

ZBrush Usage Questions
#1

Hi
I have a problem that occurs when I try to save as a zpr.

This is my workflow:

  1. Load in object with (approx 3500 points and has multiple UV tiling)
  2. Polygroups to UVs to assign the polygroups to the UDIM space.
  3. Subdivide the object to level 8 (now 53 million points)
  4. Save zpr.
  5. Error warning flags up. Object geometry is now all screwed up.

I have tried the same workflow but only dividing to level 7 instaed of 8. I am able to save as a zpr without issue.
However this will not provide enough resolution for sculpting.

I have also increased compact mem to 4096 but it makes no difference.
I have a 3Ghz machine with 32gb of RAM.

Any ideas anyone?

Here are some screen shots to illustrate the geometry issue:

Attachments

Zbrush-error.jpg

#2

Divide your object into a several smaller subtools?

#3

Thanks for replying jr

Although i was trying to avoid it, I think that is what I’ll have to to do.

In your experience do large pieces of geometry/high point count have this problem when saving?

Be good to have the problem confirmed by anyone else too…

#4

Sorry, I am not so experienced and have never seen this. What do the warning messages say?

#5

The dialogue is:
‘An error has occurred whilst trying to save a tool. Saving has been aborted’

The model remain intact until I drop down to a lower subD level at which point the geometry becomes scrambled.

#6

Do you really need 8 million polys for a basic object like that? I’ve had similar issues like yours but only when the imported objects had lots of triangle polys. Try running the ZBrush Mesh Integrity check and see if it comes up with anything, if it does you can click on Fix Mesh.
Another option is using the Crease function to beef up the edges, which can avoid geometry collapsing or shrinking.

#7

Thanks for replying dillster,

I’ve decided to break the object up a little but I will try what you have suggested and see it it helps too

many thanks

#8

Did you try just saving the tool (.ztl) instead of a .zpr?

#9

Thanks Thor

Yes tried that too…same issue.

#10

I have this exact issue. The object I am working with winds up at 50 million polygons at level 3. I am making skin details for a naked model to be exported to four 4k udims. At the highest subd Zbrush is only using around 12GB of ram, with nearly 50GB still free. This is a new system I am building and migrating to.

The system is as follows:

OS: Windows 10 Pro
CPU: I7 6700k
RAM: 64 GB @ 2666 MHz
SSD: Samsung 850 EVO 500GB
MB: Asus Maximus Hero VIII
PS: EVGA 850 P2

I just have an old ati 5770 as a vid card in it right now, as I still need my nvidia card in my working system along with my data drive. Obviously I am using the 64 bit version of Zbrush. Could this be a virtual memory issue? I am going to try deleting the lower subd levels to see if the model will remain usable at such a high subd. I also will try making a ram drive and assigning Zbrush’s scratch disk to that to see if it helps. If anyone has any ideas I would love to hear them.

#11

After much experimentation I discovered it’s the UV’s that are the cause of this issue. If you delete the UV’s from the object it will behave normally. Unfortunately that makes it impossible to bake. I am going to go over the UV’s and see if I can figure out what the error is.