> 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.

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