CS-460/560, Week 14-C
Spring, 1998, 
R. Eckert

Illumination and Reflection

Light Sources:

   1. Ambient (nondirectional, diffuse, background light)

   2. Point Sources (directional)

Types of Reflection:

   1. Diffuse (Lambertian, nondirectional--dull, chalky)

   2. Specular (Directional--mirror-like, specular highlights)

Intensity of Reflected Ambient Light:

   I = k  I     where k  = ambient reflection coefficient
        d  a           d

                and I  = Intensity of ambient light in scene

Diffuse Reflection of Light from a Point Source:

Specular Reflection of Light from a Point Source (Phong Model):