Hi guys!

I am trying to calculate the drainage direction about Mont Blanc.

I have a problem related to “Insufficient interpolation point for a curve”.

Some of you can give me some advice about this problem? I am attaching my model and the grasshopper file!

Thank you in advice!

20200320_Parte di Monte Bianco.3dm (6.4 MB)

02DrainageScript-2.gh (10.1 KB)