Lecture 14: Intro to Material Modeling (6)
jamesyc23

The BRDF should satisfy some sort of energy conservation. The total outgoing radiance along omega_o can't be greater than the incoming irradiance (i.e. f_r is upper bounded by 1/pi). Otherwise, the LHS would be greater than L_i, that is, the radiance from every incoming direction is less than the radiance from every outgoing direction.

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