Simple(?) loft not working

[NiklasG (Niklas)]

I have a list of radial aligned lines created fully in grasshopper.
I split the list in 2 lists with every 2-nth line in the other list.
I now “weave” them back together but I cant loft them…
How can I fix this?
Grasshopper Loft Problem.gh (15.9 KB)

[michaelkreft]

You need to cull the first or last item in the list, then set the loft options to closed

[lander (CAD CAM CNC)]

This one worked too maybe:

I’m not sure what to do with the seam though.
Grasshopper Loft Problem_emod.gh (18.9 KB)