SubD Sharp Corner

Hi, forum, why i cannot get this subD corner sharp?
if i use the _SubDcrease the command ask me for internal SubD edge only i expect point also ?
what i’m missing ? thks

You can only crease it fully (_Crease), whereas SubDCrease is a soft crease that works on internal edges.

that’s what i needed thank you.

RH-79519 is fixed in Rhino 8 Service Release 4 Release Candidate

Hi,
I’m using Rhino 8 and working with a SubD. I’m trying to remove the rounding on the outer perimeter (border / naked edge) to get a sharper edge (ideally perfectly straight).

Issue: the _SubDCrease command works on internal edges, but it doesn’t seem to work on the outer border edge in my case.

  • Is there a recommended way to sharpen a naked edge on a SubD?
  • Should I use **_Crease (hard crease), set the corner as a Corner vertex, or add InsertEdge / supporting edge loops close to the border?
  • Is there a specific command/workflow to control the outer boundary of a SubD?

I can post a wireframe screenshot if needed.
Thanks!

select corner control point - Crease