Customizable stereographic projection

Here's to [Stereographic projection](http://www.thingiverse.com/thing:202774). Use the customizer here to generate a classical stereographic projection with the dimension you want.

Find my things about stereographic projection in [stereographic_projection](https://www.thingiverse.com/JustinSDK/collections/stereographic-projection).

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- *[OpenSCAD Documentation - Traditional Chinese](http://openhome.cc/Gossip/OpenSCAD/)*
- *[OpenSCAD Documentation - English](http://openhome.cc/eGossip/OpenSCAD/)*

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