(bug) bad Meshing

Rhino Rhino for Mac
1

i get an unexpected meshing result (Rhino 8, Mac)

bad result

unexpected result - Minimum edge to surface distance is ignored ( not reached )

Screenshot 2026-09-03 at 16.36.45
Screenshot 2026-09-03 at 16.36.451920×1021 282 KB

fix

can be fixed by setting
minimum initial grid quads to 16

Screenshot 2026-09-03 at 16.45.52
Screenshot 2026-09-03 at 16.45.521920×963 308 KB

workaround

(generally before creating the geometry) CreaseSplitting → Enable
(“repair” after creating the geometry) DivideAlongCreases

file

badMeshing.3dm (3.0 MB)

kind regards - tom

2

Hi Tom,

Thanks for sending the file and for having narrowed it down: you’ve found the “minimum initial grid quads” setting works for this, and this means that this is now much easier to examine in general.

I filed this as RH-98402 so it gets tracked:

In the meantime, you found two workarounds:

  • minimum initial grid quads to 16 (or a higher value).
  • Or enable CreaseSplitting

Thanks again for now,
Giulio

3

this is an old problem in the mesher, it doesn’t know how to deal with those tangent transitions

Another way to fix the meshing is

DivideAlongCreases  SplitAtTangents=No  SplitAtKinks=Yes

image
image1372×712 256 KB

4

…:heart:

thanks for having a look. cheers - tom