@Michael
Cool new script: a golden one! ;)
Seems
For a line find 2 golden points: cool
For curve find only one out of the curve (when it find ;)

@Lejan
About Sketchup for all that curves: Loft, NetWork, Surfaces...etc take the free versatile Fredo6's Curvy loft!
http://forums.sketchucation.com/viewtopic.php?t=28586