Begin / End curve ?

 From:  Frenchy Pilou (PILOU)
4237.3 In reply to 4237.2 
After a sweep some open profils were rotated for any reason so some twists are created

In top view (without surfaces for better view) all profils are similar
If curves have a special colors at start (green) extremities (color point) that will be a "+" for choose them and un rotate :)
(as red square then points are overlapsed)

But your script can also make the trick !
(I have try it: its works very well !)

EDITED: 2 May 2011 by PILOU