How to convert the Open Brep to a Surface?

Hi all,

When I loft 6 curves to create a surface, it creates an 'Open Brep' rather than a Surface.

How to convert the Open Brep to a Surface?

Replies to This Discussion

Permalink Reply by Wong Wai Hang on April 27, 2016 at 7:31pm

Thanks all of you.

I am going to repeat your sample drawing (add a kink in curve) for my interest.

You reminded me to examine the curvature. I think

this may help me to get untrimmed surface rather than poly-surface in Grasshopper.

Permalink Reply by Wong Wai Hang on April 28, 2016 at 4:43am

Hi Tom,

I have repeated the drawing exercise. Your finding about the kink on curves are right.

It may or may not affect the loft result like what you said.

Tested couples curves on loft command, with different curve degree and different no. of control points,

Some work and some not. Even with the same degree curve and same no. of control points, the results are same. As David mentioned, avoid degree 2 curve will increase my chances to get untrimmed surface.

I found this is quite useful.

Cheers

Hi David,

However it is not possible by just looking at the shape of a curve to say where stacked knots might be, but you can use the Rhino _List command to inspect all details of a Nurbs curve.

What should I look at in the list command o find out the stacked knots?

Rhino 6 Dream command under rebuild.

If this command had a control on max. deviation of the rebuilt curve (let said the figure can go around 0.001mm), at the same time allow us to set either point counts or curve degree or none (self-generated), It will be fantastic.

It really helps us to built good quality curves.

Cheers