Autodesk Revit Architecture

[#1]

The shape is a sweep of a curve on another curve. It is not a revolve. 

(1) Not able to sweep

(2) Only need the outer shell surface if I do a sweep with a closed curve

[#2]

This is Alfredo Medina territory, he'll be back soon.

[#3 · Accepted solution]

Have you seen the May 2012 issue of Augi World?

There is an article there, on page 10, about hypars and other similar forms, written by a friend of yours.

[#4]

Thanks for that link Alfredo, great publication too.

[#5]

Many thanks Alfredo and Vector2 for your spontaneous help! Great!