Sort Polyline curves with same Z coordinates to same data tree branches

[Joseph_Oster]

Separate contour into list chunks

[missing] Have done a lot of sorting and grouping by Z values, here’s a recent example: [image] Another example: [MIndex_2017Jan22a]

How to find points with the same x & y values in a list

[MIndex_2017Jan22a (1)] P.S. This code example doesn’t show it but with code like this (using sets), it’s often useful to round off coordinate values to 0.00001 (for example)

List get lowest position z when branches have same x,y

[image]

Set Member Index Example (MIndex)

https://discourse.mcneel.com/search?expanded=true&q=member%20index%20%40Joseph_Oster

@magicteddy

Can you upload your GH file with internalized geometry ?