> "analytic cylinder" you mean - cylinder created from draw solid menu?
Yeah, or also extrusion of a circle will generate one also - if you turn on the control points of the sweep-constructed cylinder you'll see it has 4 control points in the straight direction instead of it only being 2 points in the straight direction. Basically sweeps are focused on making curvy shapes and go through a refinement/fitting process as part of the construction, one byproduct of that is that the surface will always be a cubic in that direction.
Extrusion or draw solid > cylinder make a more basic cylinder that also will be a special class of surface that can generate more precise results for some kinds of intersections.
- Michael
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