Now, how Stewer and Bagginsbill tried to explain, the math in the original image wasn't right. If Firefly's programmer and the shader guru agree, I'm sure they are right. No need to get unfriendly here.

I don't have a problem with lengthy explanations either. But please, do not get personal.

The shader pictured above will produce the render pictured above. BB just explained why. 

A ship in port is safe; but that is not what ships are built for.
Sail out to sea and do new things.
-"Amazing Grace" Hopper

Avatar image of me done by Chidori.