Closed curves into surface

Hello guys!
I've got a problem. I'm trying to create new surface based on imported brep from rhino. The output surface should have filleted edges. The thing is, that no matter what I am doing, I can only create surface inside each of created curves, but actually I want the surface to be between those curves [please see attached image].

Is there an easy way to aproach this? It looks easy, but I've been playing with this for quite a few days now, and been only able to achieve this result partially, and only with mesh [but I want to stick with nurbs].

It is also important to me to use Offset component as starting point. Any help much appreciated. Even text explanation how to approach this would be awesome. Maciej

Attachments:

problem.jpg, 1.1 MB
problem.3dm, 43 KB
problem.gh, 8 KB

Replies to This Discussion

Permalink Reply by Birk Binnard on May 9, 2017 at 11:32pm

Here is an excerpt from a GH file I made some time ago that may help you. It includes a VB fillet routine I found once upon a time that is a bit quirky, but usually works OK.You have to play with the 2 Boolean variables to get the fillet to work the right way.

Note that Rhino has problems with fillets; they get pieces whacked off, at least when the geometry is exported as an STL file. I found an obscure fix for this - just prior to exporting run the Rhino "_DivideAlongCreases _SplitAtTangents=_Yes" command. I'm not really sure what this does, but it seems to fix the problems with exporting fillets.

Attachments:

fillet.gh, 12 KB

Permalink Reply by Maciej S on May 14, 2017 at 9:26am

Hello again!

First of all thanks for help Tom and Birk. It took me a couple of days to play around with tools you provided. AS Tools turned out to be pretty crazy, but unfortunately I couldn't achieve result I wanted with them [probably because my lack of eperience with grasshopper]. In the end I've managed to find a way in grasshopper vanilla to create chamfer-like shape of the edges. It's a bit janky, but it works in my cases. Anyway, thanks again :)

Attachments: