Desiderata

• A model that uses physical properties that can be looked up in the CRC Handbook of Chemistry and Physics (indices of refraction, reflectivity, conductivity, etc.)

• Parameters that that have clear physical analogies (how rough or polished a surface is)

• Models that are predictive (the simulation attempts to model the real scene)

• Models that conserve energy

• Complex surface substructures
  (crystals, amorphous materials, boundary-layer behavior)

• If it was easy... everyone would do it.

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