Parametric spherical diffuser for Neopixel Ring (or any other light source)

Here are the OpenSCAD script parameters:

• rCal = 40; //external radius of diffuser
• hCal = 25; //height of diffuser
• hBase = 0.5; //height of the "base ring" around the diffuser
• thickness = 1; //thickness of the diffuser

I made it for lanterns lit by Neopixel Rings and I needed it to be parametric. I hope you'll find it useful.