@E_Leo So, I tried several approaches with the new Knife command (Rhino WIP) Rhino BETA Feature: Knife but I couldn’t get anything satisfactory. With Knife I could limit a loop to a specific area, but it did more harm than good. What worked instead was InsertEdge and Slide with crease turned off. Basically I did what 99% of mesh modelers do: insert an edge loop and use Slide to move the chain closer where you want a sharper angle, and farther away where you want a more pronounced bevel (Knife is meant for breaking the chain so it doesn’t affect other areas of the mesh).
I’d advise against using crease, since you’ve already run into that continuity problem yourself. You spotted it, but the vast majority of people modeling with SubD don’t even look at this stuff, and then it’s up to people like me to fix it before the mold. A real pain.
Regardless of that, inside the file you’ll also find how I handled the G0-to-G1 transition between the sharp edge and the rounded area after the NURBS conversion. I didn’t spend too much time on surface quality to bring it up to G2, because what matters is that you understand the process; then it’s up to you to put in a bit more time to make it even better, if you want.
blendsrf and Rhino BETA Feature: Patch re-implemented
Regardless of that, I’ve noticed SubD-to-NURBS conversion issues too. I think that if you spotted that continuity problem with the crease, you probably also noticed these issues in the other areas of the file. (But hey, no worries, by the time it reaches someone like me who has to make the mold, they become my problem, hahah. Relax, 9 out of 10 SubD modelers don’t even notice this stuff. I’ve been fighting with these problems for a while.)
Anyway, here’s the file, have a look. I’m almost completely sure that if InsertEdge plus Slide doesn’t work for you as a method (the one I show you in the video), you probably won’t find much else, unless someone comes out with something truly mind-blowing.
Sample_Part-brv.3dm (1.8 MB)
ah this will come in handy, but it’s still from the new Rhino WIP