Select all the Inner and Outer Points

[martynjhogg]

Can anyone suggest a good way to select all the points around the inner and outer edges of this network of lines?

InnerOuter.gh (134.9 KB)

[akilli (Ethan Gross)]

Hi Martyn. You mean like this?

[martynjhogg]

Ha! I love it when something that seems complicated can be done with less than 3 components! This must be a record!

Why does it work though?

[akilli (Ethan Gross)]

I dunno how to explain it further than by examining what the components do. The Region Union essentially combines them all into one big surface, bounded by two polylines, and Discontinuity gives their vertices. I think that as experienced GH users, we’re sometimes misled into expecting the worst!

[martynjhogg]

Yeah, Region Union is giving the 2 boundary polylines. I would have never guessed it would do that from the input but it’s very useful here!

Thanks again!