"Kirk Andrews" <kir### [at] tektonartcom> wrote in message 
news:web.484985d0de6841fdb555cae70@news.povray.org...
>> Yes. Keep a running note of the vector that you used to start the 
>> previous
>> circular sweep. Then use the VPerp_Adjust function in math.inc to adjust 
>> it
>> so that it is perpendicular to the direction of the spline for the next
>> step. This avoids suddenly getting a vector that points in completely the
>> opposite direction and should therefore avoid the irritating twisting
>> effect.
>>
>> Regards,
>> Chris B.
>
> Ah!  Thank you.  Works great.  I didn't think to look in math.inc for more
> vector functions.

My pleasure. I remember it took me quite some time a few years ago to 
discover it when I wanted to add some clothing around a limb and I don't 
think I've ever used it for anything else since :o)

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