How can I renumber curves? I want to renumber the curves according to Z-axis

Grasshopper
1

Hi everyone,

I have a series curves, one up one according to Z-axis. However, the number of the curves is not continuous in Z-axis. How can I renumber the curves?

renumber1
renumber1.PNG676×650 29.9 KB

renumber2
How I show curve number:
renumber3

Thanks!
renumber.3dm (229.2 KB)

2

if you’re bringing the curves from rhino in the first place, why not simply select them ‘in order’ (bottom to top or vice versa)?

3

I can’t open your R6 file in R5. What it looks like is that you want to sort the curves in Z-order? There are several ways to do that, easier done than explained.

4

Thank you Joseph!
renumber_v5.3dm (239.4 KB) Here I uploaded the v5 file.

5

Here’s the general idea using planar curves I created: (internalized)

sort_curves_2019Jul10a
sort_curves_2019Jul10a.png971×405 24.1 KB

sort_curves_2019Jul10a.gh (10.1 KB)

Your curves, however, look more complicated
 not planar and not all starting at the same place, so that could mix things up
 standby.

OK, I divided each curve into ten points and used their Average (roughly center) for the sorting. The ‘Tree/List Viewer’ is just a trace tool for examining trees of geometry in a visual way.

sort_curves_2019Jul10b
sort_curves_2019Jul10b.png1170×464 44.5 KB

sort_curves_2019Jul10b.gh (126.5 KB)

All curves internalized, no need for Rhino file.

P.S. To explain further, Sort is sorting Z values and the Avr points (‘A’ input) and curves (‘B’ input) get sorted in the same sequence as the ‘K’ (Keys) input.

6

That’s a great job, Joseph!!
Thank you so much for your kind and prompt help!

7

Well, this isn’t infallible. Irregular curves could mix it up, requiring more effort to determine valid Z values to sort by. But this is the general idea.

8

The more I use it, the more I like it. Thanks again!

9

They Loft better when sorted, eh? :wink: But I see two areas that look ugly (twisted), even with “Align sections” enabled. Still needs work?

To get a clean Loft, I added an Anemone loop (white group) after sorting them in sequence. It flips each curve and adjusts its Seam (start/end point) to match its predecessor. No Loft options required.

sort_curves_2019Jul10c
sort_curves_2019Jul10c.png1089×558 115 KB

sort_curves_2019Jul10c.gh (131.8 KB)

P.S. This is what Loft produces at three stages of the model. Left to right, below:

  1. raw curves, unsorted
  2. curves sorted by Z value of Avr points
  3. sorted curves after Anemone with matching directions and seams

sort_curves_2019Jul10c2
sort_curves_2019Jul10c2.png510×626 82.8 KB

2 Likes
10

Wow
Joseph, your work is fantastic!! And thank you so much for your kindness! I really need some time to fully understand your code :).

1 Like
11

Hi Joseph,

Here is a new problem. As you see the pic, this kind of curves still has the problem of sorting. Coul you please help me have a look?

Thank you again!

Capture
Capture.PNG837×617 38.4 KB

curves.3dm (907.7 KB) sort_curves_problem0827.gh (28.4 KB) )

12

There is no magical best solution that leaps to mind
 Maybe sort the rings by the highest point on each ring? Seems to work, didn’t check all possible cases.

sort_curves_problem_2019Aug28a2
sort_curves_problem_2019Aug28a2.png809×419 25.2 KB

sort_curves_problem_2019Aug28a.gh (28.8 KB)
sort_curves_problem_2019Aug28a
sort_curves_problem_2019Aug28a.png1156×639 28.8 KB

1 Like
13

Hi Joseph, thank you so much!!
Actually I had the same idea (find the higest point) of you
 However, I can’t realize it in GH :).
I think your method can be suitable for most my cases.
Nice job!