Implementation of the Cook Torrence Reflectance Model via a WaveLength Based Physically Based Renderer
The Paper can be found here - http://inst.cs.berkeley.edu/~cs294-13/fa09/lectures/cookpaper.pdf
Sun Spectral Values can be found here - http://rredc.nrel.gov/solar/spectra/am1.5/ASTMG173/ASTMG173.html
Material Refractive Indicies can be found here - http://www.cvrl.org/cmfs.htm
Top - Alluminium
Bottom - Brass(left), Gold(Middle), Silk(Right)