Illumination and Shading
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Bidirectional Reflectance

Reflected light is related to incident light
I = p E e
where:

  • p is ratio of reflected intensity for a given direction to incident energy from another
    = bidirectionalreflectance

    • Cook - Torrance Illumination Model:
    I = f ka pa Ia + sum[i] (Ili (N.L) d[omega]i (kd pd + ks ps)
    where:

  • f is unblocked fraction of hemisphere
  • ka, kd, ks are properties of material

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