find closest point with same index value

I have a series of points along a set of U-curves on a surface. I need to find the closest point between any given point, and the points of the same index from the other U-curve paths. For example, if there are 41 U-curves, each with 161 points along them, I want to pick a point and be able to search among only the 41 points of the same index value.

I've tried to do a series component going into a list item component, which works when only one index is selected from the 161 available; I thought the same logic would work to be able to run the same operation on all 161 indices at the same time, but it doesn't seem to work quite so simply.

Another way I thought of doing it would be to say I want to pick a point of branch x, index B, and search only the two points next to it, which would be x,B+1 and x,B-1, but I don't know how to perform this logic in grasshopper.

Any suggestions?

Attachments:

surface isocurves 2.22.12.gh, 13 KB

Replies to This Discussion

Permalink Reply by Hannes Löschke on February 23, 2012 at 4:58pm

You don't actually need to graft the points to search from (P). This will give you a tree with 161 branches, containing in 41 subbranches the closest points for each point in your points matrix. (need to remove the branch selection though ;) )

Permalink Reply by Mark Pothier on February 23, 2012 at 4:57pm