Hello everyone,

I have four different rectangles as polycurves. Extracting their curves, start and endpoints consequently, I have the following code:

I would like to combine the start and endpoints without flattening such that the list @Level1 have 8 elements, namely all startpoints and endpoints of every rectangle beside each other without loosing the level structure.

On of ways I thought of is a list combination by list.join which returns null’s, which I actually cannot understand why. I hope I do it exactly as described here.

Does anybody know how it could be possible?

I would be grateful of your help.