Quote -

WARNING: GEEKY, MATH-TYPE STUFF AHEAD.

Don't know if that's of interest, but maybe it helps.

I added that to the lighting tutorials thread that I have going.  It might be "geeky", but it explains it clearly. I even understood it!!!!!!!!  LOL

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi