Select curves that goes in the same direction

[user126 (Tobias)]

Hello
I am trying to divide the grid of curves into three seperate lists of curves with equal direction. I have tried to do it with vectors of the curve and then use cull pattern, but it didn’t work.
Hope you guys can help me solving this problem.

[HS_Kim]

Have a try this way.

Directions_re.gh (14.2 KB)

[user126 (Tobias)]

Thank you!! It works perfect!