Loft options...invalid curve?

Hi alI, have two questions concerning the loft component in the attached definition

  1. Why are the curve profiles invalid, it appears to be only in the loft
  2. Can someone point me in the direction for an explanation of the loft options component, I have been fumbling around with trial and error for effect.


Loft options.3dm (8.7 MB)

Loft (16.0 KB)

as it seems, while projecting the initial curve onto world xy plane some of the controlpoints are duplicated. (don’t know why this curve is valid). “Create set” removes these duplicate points and lofting works fine.