Re: Spiral Or Helix?

I want to create a form similar to the one in the atttached picture.
> I'm guessing that it is an extrusion using a 3D polyline as its path.
> All lisps I have found don't give me what I am looking for. Do I have to > use
> a lisp to accomplish this? How are spiral staircases designed in AutCAD?
I think you would have to break it down into the separate arcs that are
coplanar & then combine them
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