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Thank you for your help, everybody. There seem to be a clear majority for B.
On all three variants the bottom third of the shaft is a cylinder. On A
the rest is a cone. On B the rest is an ellipsoid (or stretched sphere,
if you like). C is a combination, where the middle third is an
ellipsoid, and the top third is a cone. The diameter where the two parts
meet is halfway between the diameters in the same place on A and B.
Personally I think that C looks more like the drawings in the book than
the two other. Hmm, maybe I should give the lathe object a shot, like
Anders K suggests. After all, IIRC the Bezier spline was developed to
simulate the behaviour of flexible rulers.
/Ib
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