Geodesic Maths for OpenScad - v0.1

A funny thing happened on my recent holiday. I built a nice 3V geodesic dome and covered it with a parachute, so me and the family could sleep mosquito free. Of course I used the Desert Domes calculator: http://www.desertdomes.com/ in order to calculate my chord factors so I could cut my wood dowels. But then I got to thinking...

The geodesic form of tesselation is certainly good for dome building, but it's probably also good for other modeling purposes as well.

This thing is a library of functions that will do geodesic calculations, written in OpenScad.

There's no pretty object to go with it. I'll have to use my handy dandy renderer and generate some domes. For now, it's the the raw routines.

First, there's some simple useful nuggets related to spherical coordinates:
sph(long, lat, radius)
sph_to_cart(s) - convert to cartesian
sph_from_cart(s) - create spherical from cartesian
sph_dist(c1, c2) - Calculate the chord distance of two points on a sphere

that right