I've been trying to find an easy way to make a spiral around a sphere, and I found a spiral generator script that lets you pick a surface for the spiral to follow. The script is pretty limited but it does do a pretty good job of following the geometry of the surface. It would be nice if the spiral was parametrically related to the surface but it's not, also it doesn't really let you change the number of coils.
post a link to the script so that I can look at it. There is probably a way to accomplish what you are talking about.
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