When we send a mesh into the new SubD component in Grasshopper, is there a way to tell it to crease certain edges? I know there is a crease input on the component, and you can right click it, but does it take any further inputs?

@dalelear @stevebaer @piac Hi All, we are looking at the same GH SubD crease problem. Our current GH workflow is to make two sets of meshes, one with all welded edges, and another one with all unwelded edges. Then we join them. Along the joined edges we also get unwelded edges. This works well, e…

Hi @silvano If you bake the SubD, do the Rhino Crease and RemoveCrease commands make the SubD geometry changes you are looking for? If so, then @DavidRutten can look at those Rhino commands and make a GH component that modifies the SubD edge tag attributes. Within the scope of a SubD, edges are per…

Hi @dalelear , @DavidRutten thanks for your quick answer. Yes, baking and using Rhino commands works, it is just not applicable to our use case. I saw that the SubD edge tag attribute is exposed in RhinoCommon now. I assume with this and the corresponding vertex tags we could make a GH Python compo…

[image] silvano: . I assume with this and the corresponding vertex tags we could make a GH Python component to get to what we need? It’s not quite that easy. There are complex constraints between vertex tags, edge tags, sector coefficients, and cached evaluations. You need to call SubD SDK to…

Thanks for posting some more technical details. We are very interested in those. In the long run, it would be great if the tools to manage edge tags would be accessible from RhinoCommon and GH.

I’ve created an issue for @DavidRutten to add SubD edge crease/smooth support to Grasshopper. RH-63863

I have a script which was put together with the help of a few users of this forum. Totally forgot @Baris helped me fix the problems in the scripts a while ago. The script accepts index inputs or points to identify edges need to be unwelded. unweld_mesh_edge.gh (19.5 KB) [image]

Bazel.gh (149.2 KB) please help me. how to add edges. ?

The problem with your geometry is that it wasn’t welded at first. I added a Combine and Clean component from Kangaroo. It does the job. Keep in mind that Mesh Topology edges are numbered in a different way than SubD or Mesh edges. If you want to see the creased SubD edges, you can use a Match Tex…

Hi Martin. Could you explain how you’re determining which edges are unwelded? Thanks.

Is it possible to choose which mesh edges to crease for a SubD object?

Grasshopper

silvano June 2, 2021, 9:10pm 16

Hi All, in another thread I made a C# component that allows to crease SubDs via EdgeTags. New functionality provided by the latest RH 7.7 update. Currently you have to use the release candidate for this to work. Thought this might be interesting for some of you.

A word of warning, some issues still persist. Any feedback is welcome.

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Is it possible to choose which mesh edges to crease for a SubD object?

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