Problem extrude circle

Hey guys,
I created a 3D geometry by creating a circle, offset and extrude. The problem is that rhino is not showing the circular geometry as a circle, but as a polygon. That leads to the next problem: I would like to fix columns at the sides of the geometry, but both the shaded view and the render view and also the section show wrong results. Is there a way to show the extrude as a circle? Any help apreciated!

help_extrude_circle.3dm (1.1 MB)

Hi - you can play with the display mesh settings.
See the links in this post:


amazing, thank you very much!! This was driving me crazy for hours!