Well, like i mentioned in my previous post color would not be mandatory, imo… Or if the final spline shape could be broken in separate pieces (after sweeping) the user may colorize it in his/her 3D app afterwards.
Here's again the link, which shows nicely, in my opinion, how such attractors can look when swept and they don't have any color.
http://www.behance.net/gallery/MathRules-Strange-Attractors/7618879
Regards
Stefan
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