delete double lines / objects

hey
i m playing with voronoi, is there an possibility to delete double lines? when you explode the voronoi
markus

Replies to This Discussion

Permalink Reply by David Rutten on November 9, 2009 at 1:09pm

Hi Markus,

deleting duplicate objects is not a ready function in Grasshopper. Normally it involves:

1) sorting all data
2) comparing each item in the sorted list with the next item, if they are the same, the item is a duplicate.
3) unsort the list of duplicate flags, so it can be matched with the original data.
4) cull the original data with the unsorted duplicate flag list.

--
David Rutten
david@mcneel.com
Poprad, Slovakia

Permalink Reply by CarloMaria Ciampoli on November 9, 2009 at 2:12pm

Permalink Reply by Markus on November 9, 2009 at 5:14pm

hey

i get it... if u know it its quite easy ;) works well with one voronoi but i have multiple...
when i explode the lines the tree is broken... can i delete the last brunch on the tree that the lines are in the old brunch order?

i uploadet the files

Attachments:

voronoi.3dm, 261 KB
voronoi.ghx, 1 MB

Permalink Reply by Rasmus Holst on November 25, 2009 at 7:35am

Hey. Did you ever figure out how to do the deletion with multiple lines? I have a 3d construction with a lot of lines. Some of the are the same even 3 of the same. So i cannot get the def to work.

Rasmus

Permalink Reply by Markus on November 28, 2009 at 5:58am

hi,
no i have no solution... sorting the lines makes it only possible to delete lines with the same lengh... maybe its possible to compare the start and endpoints of the lines with XYZ values. and delet the lines with the same start and endpotins...

Permalink Reply by Aaron Coffman on September 29, 2010 at 1:07pm

here is something i can up with while in studio today. ive been looking for the same thing and nothing ive found has worked. i have tested this one with up to about 20 lines and it still works.

let me know if anyone else has luck with it or if there are issues.

Attachments:

removeDupEdges.ghx, 106 KB

Permalink Reply by taz on September 29, 2010 at 1:30pm

Not sure if Kangroo has been updated for GH 0.7, but it contains a delete duplicate routine:

http://www.grasshopper3d.com/forum/topics/management-of-lists?comme...

I would try to find the latest version from the group page:

http://groups.google.co.uk/group/kangaroophysics

Permalink Reply by Shawn Fernandez on September 29, 2010 at 2:20pm

Another easy method is to write a quick VB script like this ...

Private Sub RunScript(ByVal A As Object, ByVal B As Object, ByRef Eq As Object, ByRef Ne As Object)
If A.ToString = B.ToString Then
Eq = True
Ne = False
Else
Eq = False
Ne = True
End If
End Sub

It basically converts the input streams to string representations and compares them. Identical geometry of any kind will produce exactly the same string and can be culled from your list. Just make certain that the input types are the same.

I use this as an absolute (==) "Comparison Operator." Attached is also a sample with the definition in a .ghx file.

Attachments: