Wasn't it Christopher James Huff who wrote:
>In article <403a4c62@news.povray.org>,
> "bongotastic" <cbl### [at] csdalca> wrote:
>
>>     Is there a way to do simple polygon/spline sweep rather than sphere
>> sweep? By this, I mean sweeping a 2D object along a 3D spline. I feel like
>> it should be there but I did not see this in the docs.
>
>There is no built in primitive that does this. However, you can do it by 
>using the scripting language to build an appropriate mesh, and someone 
>may have done an include file for this already.

Now that the web interface to news is back up, I can tell you that you
can get my SweepSpline macro which does that from

http://news.povray.org/povray.binaries.scene-files/thread/%3C3fb73d9e%40news.povray.org%3E/

(The trick for finding the message-id, and thereby writing more direct
and shorter URLs seems to not be present any more, so you'll have to
make do with this long threadwise URL.)

For a polygon to work properly, you should make it a linear_spline and 
ensure that its control points take values that are multiples of 
1/Vpoints. E.g. if you tell the mesh to use 20 points around the 
circumference, then you can set your control points to multiples
of 0.05

-- 
Mike Williams
Gentleman of Leisure

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