Subdivide Mesh

gianpaolo_savio1 · February 12, 2021, 9:35am

Hi,
I’m using the SubDivide command on mesh, but instead of a Catmull-Clark subdivision I obtain a flat subdivision. Moreover, in Rhino 6 there was more options for the same command.
What am I doing wrong?
Thanks,
g

Joshua_Kennedy · February 12, 2021, 12:16pm

Hi,

I think you’re looking for the ToSubD command

https://docs.mcneel.com/rhino/7/help/en-us/commands/tosubd.htm

Normand · February 12, 2021, 1:14pm

Hi @gianpaolo_savio1
This is discussed here in more detail. Hopefully we’ll get CatmullClark back at some point. Look, @dalelear - here’s another of us missing the ability to subdivide meshes with CatmullClarke directly, so it’s not just @Gijs and I
Cheers and happy Friday, Jakob

gianpaolo_savio1 · February 12, 2021, 2:17pm

Thanks,
Following your advice (@Joshua_Kennedy, @Normand and @Vanessa), I found a solution: it’s possible to use the commands ToSubD+Mesh or ToSubD+Subdivide+ExtractControlPolygon.
Have a great weekend,
g

Gijs · February 12, 2021, 2:33pm

and does this keep your texture coordinates?

dalelear · February 12, 2021, 5:57pm

This issue of using the SubDivide command to work on ordinary mesh objects will get more attention in Rhino 7: Details in RH-62762

In particular, there are cases where ordinary mesh per vertex attributes like color, texture coordinates, and visibility, will not persist in the manner many users expect when the workaround

mesh0->ToSubD->subd0->SubDivide->subd1->ExtractControlPolygon->mesh1

is used.