Matched pairs and closest points

[Joseph_Oster]

This sounds remarkably similar to a recent thread about a perforated “LobbyWall”:

Aligning and lofting multiple shapes in Grasshopper

Some of the complexity in this model could have been avoided had I selected the curves from the Rhino file more judiciously, or treated them as two holed surfaces (below, yellow group). The two duplicate curves may still have caused trouble but that’s a separate issue. [LobbyWall_2021May6a] LobbyWall_2021May6a.gh (1.5 MB) If the entire model (the Voronoi holes) were done in GH instead of Rhino, such organization tends to come naturally.

Applied to your curves (after moving one set of curves some distance vertically), it looks like this:

matched pairs_2021May11a.gh (30.3 KB)

As you can see, three curve pairs have a common curve at one end… I haven’t figured out yet how to determine which of the two in each of these three pairs is shorter, which logically seems like the correct choice? Better than a manual length slider, eh?