Embeddable Hinge for OpenSCAD

I've got a rounded case I've designed, and I wanted to hinge one side of it. Looked around for hinge models, but nothing quite worked the way I wanted. In particular, I wanted the hinge to visually "disappear" into the existing edge fillet, but the discrepancy between wall thickness and the necessary hinge radius just wouldn't work out.

So I made this tool :)

This is NOT really intended for making hinges directly. The idea is that if you are designing something in OpenSCAD and need a hinge, you can "use " to bring in the module and then define the hinge the way you need it so that it integrates (overlaps, probably) with the relevant parts of your design.