Cook-Torrance Model

I

r

=

I

i

(

s R

s

+

d R

d

)

cos

a

d

w

a

: angle between H and L

R

s

: specular reflectance

R

d

: diffuse reflectance

s+d =1

P

N

L

H

V

light source

viewpoint

g

g

z

N

: unit surface normal

V

: viewing direction

D

: distribution function of

directions of facets

G

: geometrical attenuation factor

F

: Fresnel factor

D

: Beckmann distribution

-

(

tan

a

/ m

)

2

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