> If you mean you want to build lines between 2 curves, there is not anything set up to do that automatically, you need to just draw the lines.
Yes!

In fact all the points of each curves are given
It just to trace a line between them point by point :)
The curious thing is that statement seems very simple

Command "Connect points" can't make that?
http://moi3d.com/forum/display.php?webtag=MOI&msg=2749.56


Of course for this particular form I can draw it easily in project some lines to the surface, for have the second layer of lines but for complex curves that is another story :)