02/04/2003
15-462 Graphics I
16
Phong Illumination Model
•Calculate
color for arbitrary point on surface
•Compromise
between realism and efficiency
•Local
computation (no visibility calculations)
•Basic
inputs are material properties and l, n, v:
l = vector to light source
n = surface normal
v = vector to viewer
r = reflection of l at p
(determined
by l and n)