@pilou said:

With SkatchUp Make I will make that

Draw some vertical lines Intersected with one curve
Select all lines
Use Draw Extrude Line along a vector (Inside Projection By Didier Bur)
Select all / Make Top and bottom caps (Fill holes by Tig )

[attachment=2:agajs7kx]<!-- ia2 -->variante.jpg<!-- ia2 -->[/attachment:agajs7kx]

[attachment=1:agajs7kx]<!-- ia1 -->GIF_proj.gif<!-- ia1 -->[/attachment:agajs7kx]

Thank you a lot! What if I have to make posts between two curved lines?

Hi to everyone. First of all I apologize for my poor english. I want to make multiple copies of a post varying the height along a curve and mantainig it's base section at the top. How can I do that? I'm attaching a sketch of what I want to do.