@ Helmut : Thank you. That's pretty cool.I have an old / incomplete script for a loxodrome which I compiled in 2010. Feel free to use (and optionally complete and improve) the script.
Servus (https://en.wikipedia.org/wiki/Servus) from Vienna
when opened by TextEdit.// loxodrome.js
// helmut jaksch
// for scripts/Splineobj Folder