It's a sphere sweep along a cubic spline.

"Apache" <apa### [at] yahoocom> wrote in message
news:3c8d7f35$1@news.povray.org...
> How did you model the cord?
>
> --
> Apache
> http://geitenkaas.dns2go.com/experiments/
> apa### [at] yahoocom
>
>

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