I had the same problem with SweepSpline.inc and never did find a general
solution. In most cases either SweepSpline.inc or SweepSplineV2.inc will
produce a twistless rendering, but there's no guarantee.

In your particular case, SweepSplineV2 produces a better result.

SweepSpline, and Ingo Janssen's makemesh.inc (which it uses) are in this
zip file:

http://www.econym.demon.co.uk/isotut/more35.zip

-- 
Mike Williams
Gentleman of Leisure

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