Extract lower vertices

[sebas1 (sebas)]

I have some parametric panels, I need to obtain only the lower points that touch the straight line. How do I do it in Grasshopper? I have tried and it doesn’t work.

thanks

model.3dm (2.8 MB)

[Eef_Weenink]

Dear Sebas, see connected .gh file for explanation

extract lower vertices EW .gh (1006.0 KB)

[sebas1 (sebas)]

I had tried several different methods but couldn’t get it to work. Thank you very much for your help.