OpenSCAD Icosphere library

So I translated the tutorial from this [blog](http://blog.andreaskahler.com/2009/06/creating-icosphere-mesh-in-code.html) to OpenSCAD code and quite happy with recursion, stability and cleanliness of the result. BUT.. when I rotate the resulting icosphere some of the tris looks distorted, the orthogonal views are looking good. I would expect every tri to be equilateral.