Hi Jean-Paul,

> But I seem to get just the same result with Network, which I
> understand to be a sort of Sweep in two directions simultaneously.

It's more like _Loft_ in two directions simultaneously.

So yes, it does give more the kind of shape that I showed there with that particular sweep + scaling rail example.

For example a Loft where you don't use any rails looks like this:






Sweep works more by actually sliding the profiles along the rails, while simultaneously morphing them between different profiles shapes. If you are having things going around a bend, Sweep kind of maintains a more rigid shape as it goes around the bend, see this previous example:
http://moi3d.com/forum/index.php?webtag=MOI&msg=3081.23


Re: Rebuild - are you using the older "RebuildCurve" command that Petr posted, or the new "Rebuild" command that in the latest beta?

In the new one there are 2 different modes, a "Rebuild to tolerance" mode, and a "Rebuild by # of points" mode:



If you use "Rebuild to tolerance" mode, it will use as many points as needed in the rebuilt curve to get it within the distance that you enter from the original curve.

If you don't want to worry about exactly how many points to use, then try using that tolerance-based rebuild mode.

- Michael