Join Overlapping Lines?

Replies to This Discussion

Permalink Reply by Gui Talarico on January 14, 2016 at 8:57am

Can you post an image/file? Lines or curves?

One way is to find the intersection, trim, and then join.

Permalink Reply by max moriyama on January 14, 2016 at 11:04am

Thanks Gui,

The lines are non-overlapping, then they gradually overlap as you work your way up. Ideally I would like to do this from a flattened list of curves because right now the left and right 'columns' are not in separate lists.

I believe they are curves, but could be converted to lines if necessary.

Permalink Reply by Gui Talarico on January 14, 2016 at 11:49am

Hi Max - 

You said "merge/join" 2 lines, but in reality you have a few dozen lines, grouped together in 2 "groups" that merge to form one.

Are you trying to create a surface out of these 2 merged groups like in the terrible sketch attached)?

Can you share the definition?

Permalink Reply by max moriyama on January 14, 2016 at 12:02pm

Well, they aren't grouped into separate groups - that is the main problem I'm running into.

Basically my question is - if I gave you these curves in rhino like the screen shot above - how would you take those curves in grasshopper (as a flattened list) and output single curves where they are overlapping?

Permalink Reply by martyn hogg on January 14, 2016 at 12:47pm

Does the JoinCurves component work?

Reference the curves in GH then plug them into JoinCurves.

You might need to reference each set of curves seperately and play with the lists so the right curves are joined.

Permalink Reply by max moriyama on January 14, 2016 at 1:00pm

No, the curves overlap (the endpoints do not meet) and they are in a single flattened list.

The screenshot above represents a small condition of a larger data set, so it is not ideal to have to to separate the curves into separate lists first.

Permalink Reply by Stephen Maher on January 14, 2016 at 1:05pm

I'd suggest something similar to this approach, just use tree/list logic to construct all your lines in one go. Hope it helps.

Also, for future reference see item three in this post.

/SPM

Permalink Reply by max moriyama on January 14, 2016 at 2:29pm

Stephen,

Thank you for your help, but I'm not sure posting a grasshopper definition is relevant in this case. The starting point is a flattened list of curves where some of them overlap. If it helps to have a rhino file I've attached one that contains a sample of curves that I'm working with.

The problem with your solution is that it doesn't differentiate between curves that do and don't overlap. 

Attachments:

• Join Overlapping Curves.3dm, 533 KB

Permalink Reply by Stephen Maher on January 15, 2016 at 7:30am

Thanks for sharing the 3DM file. I was able to achieve what you're looking for with some (not very elegant) sorting methods. See attached.

P.S. I'm using the Human plugin to reference, bake, and visualize geometry.

Attachments:

• overlapped_no_more.gh, 19 KB