OpenScad Helix Library

Edit Dec 7, 2022
* Updated the algorithm used to interpolate between samples when creating a helix with a filled in core. This fixed some artifacts that could happen in some cases and improves accuracy in all cases, although it made the code run somewhat slower.
* Optimized one of the internal functions by doing some paper pre-calculations.
* Removing the "work-in-progress" designation

Yet another helix library (that nobody asked for).

I wrote this library because I was learning OpenScad while working on a project that required a helix, and after doing a half-hearted search finding a half dozen libraries, I decided to write my own as an exercise. I added every feature that I thought I would ever want in a helix library and this is the result.

Included is a file that contains a number of examples:
* Spice Jar Cap - showing how an inside thread can be created by subtracting a helix from another solid shape
* Drywall Screw - shows that a thread can be wrapped around a core