Hi,

I've created a macro which builds a helix from sections of tori. By 
specifying the end points, the major and minor radii and number of 
turns, it will spit out a coil. Bug-free or your money back.

You can check it out here:
http://news.povray.org/povray.text.scene-files/thread/%3C4c3feb59%40news.povray.org%3E/

Sam

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