Arc Module for OpenSCAD

This is a 2d arc module for OpenSCAD that works for any angle between 0 and 360.. It takes arguments for the outside radius, thickness, and angle of the arc. It works by intersecting a ring with one or more triangles to create an arc. For every 90 degrees of arc, another triangle is added.

Usage:

arc(radius, thick, angle);
radius: Outside radius of the arc
thick: Thickness between the outside and inside radii
angle: The angle of the arc, anywhere between 0 and 360.


[`linear_extrude(height)`](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Using_the_2D_Subsystem#Linear_Extrude) can be used to make it 3d.