> However, the usage
> of bezier_spline and its controller points is not very clear from the povray
> documentation.
>
> How can I use bezier_spline in this example?

The splines are hard to follow because the doc is spread at various locations.
The page I like is the following one:
 http://www.povray.org/documentation/view/3.7.0/60/

If you know a little bit about bezier splines, it should be clear what povray
does from this page...

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