Offset Surface Problem

[Jaeyoon_Jeong]

After offsetting operation of L shaped surface, I found some skewed region was made. This region makes some next operations failed. I’d like to know whether there is any effective way to remove this region or preventing the creation of this kind of shape.
Thank you in advance.

[Jaeyoon_Jeong]

I found useful stuff about this kind off cross region in the following link.

Problem Offsetting Surface

Offset appears to be working properly with your file. Offset curved surfaces can sometimes result in surprising shapes. The curvature of an offset surface will be different than the original surface. Creases will develop if the offset distance is large enough. The shape of an offset surface will be different than a scaled version of the original surface. This behavior is how the geometry works, and is not due to any problems with Rhino. If you still have questions about your results post a fil…

Okay. I got it. I’d like to know how to check offset surface would have this problem with some numerical way? I mean there is rhino common API or Grasshopper components?

[maje90 (Riccardo Majewski)]

find curvature.gh (11.7 KB)

This is a draft, fast made, method to find the smallest curvature in a surface by analyzing its UV curves.
U and V curvature should be combined, i didn’t do that… and probably there are already better methods.
Edit: as david pointed out, this is wrong.

Is this somehow useful?
What you need to do?

[davidcockey]

Surface curvature is distinct from curvature of UV curves. Simple example of a curved surface with straight (zero curvature) UV curves: CrvSrfStrUVDC01.3dm (263.6 KB)