Finding the nearest points to another point?

Basically, I have two surfaces (see Rhino file below) I want to connect each point on the inner surface to four points on the outer surface. My end goal is to extrude a truss system from the resulting curves.

I've drawn in some lines in the rhino model to illustrate what I'm trying to achieve

Attachments:

Points between two surfaces.3dm, 104 KB

Replies to This Discussion

Permalink Reply by Danny Boyes on November 26, 2010 at 10:27am

The Three main Components to use here are: Distance, Sort List and Sub List.
1) Measure the distance between each point in first list and every point in 2nd list. (Hint: graft the first list)
2) Sort results and synchronously sort the 2nd list.
3) Create a sub list of the first four items.
4) Connect each of the points in first list (again graft) to the sublist

Permalink Reply by Anthony Gugliotta on November 26, 2010 at 10:37am

Sorry, I guess I should have mentioned I'm new to Grasshopper.

How do I graft?

Permalink Reply by Danny Boyes on November 26, 2010 at 10:44am

There is a separate component in the Sets>Tree section or you can use the right click context menu and select it from there. (the context is only available in v0.8)

Permalink Reply by Anthony Gugliotta on November 26, 2010 at 10:58am

I'm running version 6 build 59 so I don't have the context menu option.

As a component where do I wire the graft too?

Permalink Reply by Nick Bruscia on November 26, 2010 at 12:23pm

Where he has a little upward facing arrow, you would have the Graft component.
So, between the flattened first list of points to A in the distance component, and then another between that same list to input A of the line component.

Permalink Reply by Anthony Gugliotta on November 26, 2010 at 12:57pm

Ok, I thought so. But I'm only getting feedback from one point. My Subset list for the bottom plane is only reading 4 points. See the image...

Permalink Reply by Danny Boyes on November 26, 2010 at 1:24pm

That's really odd. Where you have the output from the distance to the sort component you should have a dashed wire representing multiple items on multiple branches but instead you have a flattened wire. I've re-done this in v0.6.0059 so you can down load the ghx file and have a look.

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