After a Group Split then a Merge All
How do you get the mesh to Smooth Divide?
- Load ZTL
- Group Split
- Merge All
Divide with Smooth = on is not smoothing.
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After a Group Split then a Merge All
How do you get the mesh to Smooth Divide?

I can’t reproduce this problem. Check that the polys are not creased by Shift-clicking the Tool>Geometry>Uncrease button.
That is a good suggestion, but it turns out it was a masking issue.
Checklist
Check that Masking is off!
Looks like a small part of one of the subtools had a mask on. not visible, but enough to cause this.
When the tools were merged, it would subdived but not smooth.