Offset Curve Direction

Hello,

I created a surface via a sweep and then took some section cuts and want to offset every other curve to be smaller and create a pleated wall. I have the curves but they offset in random directions. How can I make sure they all go in the same direction - I've searched a bit and can't seem to find a post.

Below is my ultimate goal done in Rhino: I'm doing this as a personal project to build my grasshopper skills so let me know if my script (attached) could be improved.

Thanks so much for any help!

Attachments:

OffsetQ.gh, 9 KB

Replies to This Discussion

Permalink Reply by David Rutten on May 3, 2015 at 1:21am

The side of curve offsets depends on the curve direction in the offset plane. If you don't specify a plane for the offset, grasshopper will try and find one that best describes the curve, but this plane may be flipped compared to its neighbors.

But even if the planes are all orientated in the same way, the curves may still be inconsistent. You may be able to unify curve directions by flipping them all using a single guide curve. I can't test now as I'm on an iPad...

Permalink Reply by Hyungsoo Kim on May 3, 2015 at 2:12am

Following David's advice....

Attachments:

OffsetQ_re.gh, 14 KB

Permalink Reply by Jonathan Culp on May 3, 2015 at 7:50pm

Thanks so much for this!! There were so many things that I learned by reconstructing it.

Permalink Reply by Etienne Eve on August 18, 2017 at 2:56am

This is magic! Thanks very much David and Hyungoo! Incredibly useful!!!

Permalink Reply by constantinos schinas on January 30, 2019 at 10:56am

Grasshopper 1.0.00007 produces flipped curves with Hyunqsoo Kim's definition. don't know why.

Corrected by flipping the original dispatched curves.

Permalink Reply by Cody White on February 14, 2019 at 2:06am

Many thanks, I had this problem and now it's solved.

run 3

Permalink Reply by Cole on November 17, 2019 at 1:56am

If anybody is reading this thread still, I found that using the scale component works great. To Scale a curve from it's center point (or offset it) all you have to do is scale an object using the area component to get an object's center point

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