Hi, My main goal here is to unify the curve direction into a same direction. So i used filter.byboolmask and reverse the vector. I’m trying to merge these reversed vector with the unreversed one by using the boolean as the base. I know this can be done by replace.bycondition but it doesnt works if i had more complex nurbs curve. Is there anyone can help? [helpppp] Thanks in advance Hagani

Hi, The above methods might not work for very extreme cases. You might want to consider looking into a solution based on this for those cases: [image] Graham scan Graham's scan is a method of finding the convex hull of a finite set of points in the plane with time complexity O(n log n). It is named after Ronald Graham, who published the original algorithm in 1972. The algorithm finds all vertices of the convex hull ordered along its boundary. It uses a stack to detect and remove concavities in the boundary efficiently. The first step in this algorithm is to find the point with the lowest y-coordinate. If the lowest y-coordinate exists in more than one poi... [2015-09-04_12-51-48]

File: UniformCurveDirection.dyn The attached file aligns all curves in a list to be the same as the first curve. [20150902-1]

Hi Vikram, Thanks for your reply. I tried your using your file but it doesn’t work with me. I have a single curbs curve with many vector at specific parameter point. What i want to do is to unify all the vector of this single curve into the same direction. Attached file best describe of what i mean… Thanks a lot H HelpUnnifyCurve

File: UniformDirectionAtParameter.dyn [20150903-1]

@Dimitar - my solution is based on the assumption that the inconsistency in direction occurs at the points where the Z axis is reversed. It worked in all cases, I’ve tried. I’ve attached a Design Script version of the earlier file. Try it out when you have some time and see if it works. File: CrUniDirAtPar.dyn [20150904-1]

Vikram, you are right. Your solution works for all cases. I should have studied it in greater depth before jumping to conclusions.

Just as food for thought, I’ve tried both and have found a case where yours doesn’t work Vikram but Dimitar’s does. I’ve used a spline (Vikrams highlighted - Dimitars not). As attached: [Normals]

:frowning: So, Dimitar was right after all :slight_smile:

Thanks to all you guys, in my case both solution works! You guys awesome! Cheers

Hey guys Could you maybe post Dimitar picture again, cos i cant zoom it or click on it. Tnx

Rebuild List From Boolean Value

Packages

Einar_Raknes July 1, 2016, 8:28am 13

It’s still available here:

http://dynamobim.org/forums/topic/rebuild-list-from-boolean-value/

How to get a vector for each point at curve

Topic		Replies	Views
Reverse PolyCurve specific segments Packages	6	1071	May 27, 2015
Change curves' direction Uncategorized	2	675	March 23, 2020
Can't consistently reverse a PolyCurve Geometry	18	299	April 28, 2025
Whether the direction of the curve is clockwise or counterclockwise Geometry geometry , dynamo	9	1979	October 25, 2021
Reorgenizing points of a changing-shape polygon Lists-Logic	9	620	October 4, 2022

Rebuild List From Boolean Value

Related topics