Image Effect creation, Wulff Net

Hello and good evening fellow Unity developers. Today I come here with a simple yet complex question.

The thing is, I have a grid made of cubes, yes, simple colored cubes, and when I look at them from above I get a good view of the grid. I need to distort the view following a Stereographic Projection, or Wulff Net as you may have heard it. (Links at the end for the curious).

Now I now that I need to make it via an Image Effect, but in the Unity Docs appears really low documentation on how to MAKE my owns. I know this is hard, I don't expect to get results this afternoon, I just want to be pointed in the right direction. I tried to modify the Standard Assets shaders (fisheye) but broke it, since its a shader and a script, and don't understand the interaction too well...

Can someone point me on what should I be doing? I mean, should I create a shader for the Stereography first, then a script to handle it? Thanks in advance to all and good luck in your projects!

Stereographic Projection: http://en.wikipedia.org/wiki/Stereographic_projection