Organizing a Points in a List

Hi & thx in advance.

I have a seemingly simple question about organizing points in a Curve | Line intersection. I have some complex curves that are being intersected by lines X times, this will always result in an odd number of intersections and I should be able to call the events in order.

My question is: How do I sort these to draw new lines from pt(0) to pt(1) then from pt(2) to pt(3) until the end of the intersection array ( (X-1) to (X) ) for each of the sets of intersections? I'm very familiar with Rhinoscript and know how this would work in that interface but I'm struggling to find the functions in GHopper.

Thx All!

Attachments:

LineDrawing_dh2.gh, 18 KB
TST_Curves.3dm, 636 KB

Replies to This Discussion

Permalink Reply by Igor on January 6, 2014 at 2:04pm

Try to build ConvexHull(Mesh tab) around intersection points and then sort your points with SortAlongCurve tool(Vector tab, curve to sort along - convex hull polyline) and create polyline from this points.....

Permalink Reply by David Rutten on January 6, 2014 at 2:45pm

Surely you mean even, not odd? The points returned by Line|Curve intersection are ordered along the curve, not the line. This seems like a stupid thing to do, I never noticed it before and I can't now remember whether there was a reason not to order them along the line.

At any rate, they have to be re-ordered. The easiest way to create line segments between points 1&2, 3&4, 5&6 etc. is to create polylines, explode them, then cull every other segment.

David Rutten

david@mcneel.com

Attachments:

Hatch.gh, 12 KB

Permalink Reply by DH on January 6, 2014 at 9:12pm

Many thx! I did figure this out after taking the one to hour break from scripting required to see where I'd screwed up. Reorienting my understanding of the logic a bit to get the tools working as well as I can in Rhinoscript. Not quite as elegant as yours. Thx again!