Illuminance critical points on generic smooth surfaces

  title={Illuminance critical points on generic smooth surfaces},
  author={Jan J. Koenderink and Andrea J. van Doorn},
We consider the qualitative structure of the illuminance distribution that is due to the illumination of a generic smooth surface under the following simplifying conditions: The surface bidirectional reflection distribution function is a constant (that is, it is Lambertian and with constant albedo), the surface is homogeneously illuminated, and vignetting and interreflection effects are absent. In that case the critical points of the illuminance distribution are determined by the local third… CONTINUE READING

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