02/04/2003
15-462 Graphics I
18
Ambient Reflection
•Intensity
of ambient light uniform at every point
•Ambient
reflection coefficient ka, 0 ·
ka ·
1
•May be
different for every surface and r,g,b
•Determines
reflected fraction of ambient light
•La = ambient component of light source
•Ambient
intensity Ia = ka La
•Note:
La is not a physically meaningful quantity