02/04/2003
15-462 Graphics I
23
Summary of Phong Model
•Light
components for each color:
–Ambient
(L_a), diffuse (L_d), specular (L_s)
•Material
coefficients for each color:
–Ambient
(k_a), diffuse (k_d), specular (k_s)
•Distance
q for surface point from light source
l = vector from light
n = surface normal
r = l reflected about n
v = vector to viewer
