Diagram of the Day #5

Its wang time again. This wang is importance sampled!
Woooo. No wonder that eye is looking at it.
Bucking the page 3 trend, this comes from p.13 of the siggraph 2010 "IS in production rendering course notes". Good work!

Diagram of the Day #4

This one comes from p.3 of :

http://langley.atmos.colostate.edu/courses/at622/lectures/supp_lecture_4A.pdf