Wasn't it Rick Measham who wrote:
>I'm looking for something like a sphere sweep but for a bezier defined 
>2d shape. Does such a thing exist?

That sounds like a call for the SweepSpline macro. 
There's a copy of it in the download at the bottom of this page:
<http://www.econym.demon.co.uk/isotut/more.htm>

It doesn't use isosurfaces, but it does a similar job to the isosurface
tricks demonstrated on that page.

-- 
Mike Williams
Gentleman of Leisure

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