c# PointCloud closest Point index method /stroking line between points

good morning all,

i am trying to rebuild a simple Annemone definition i found in this thread:

http://www.grasshopper3d.com/forum/topics/sorting-points-along-curv...

it is connecting the midpoints of some given lines using the closest point method.

i got stuck when i need to connect the midpoints. I am recieving some values of the closest point method but i am not sure they are right.

Now i need to connect the index 1+2,2+3,3+4,..., or just stroke a polyline through all of them at once?

Maybe someone could enlighten me.

Thanks in advance for everyone taking the time!