As a beginner in 3d, I wanted to understand cycles node mathematics and equations. Sadly I couldn't find documentations on them mathematically speaking, which can save time while doing PBR.

I learned of many engines with blender integration, Luxrender made me interested, a real light physical calculation than faking it.

I found the tutorial on CG Cookie, I tried and wanted to give my own touch to it.

https://cgcookie.com/blender/2011/05/21/creating-a-battery-in-blender-and-luxrender/