Radiation and Participating Media Interactions
Figure 4-26: Example of interactions between participating media and radiation.
In some applications the medium is not completely transparent and the radiation rays interact with the medium.
Let I(Ω) denote the radiative intensity traveling in a given direction, Ω . Different kinds of interactions are observed:
Scattering: Part of the radiation coming from a given direction is scattered in other directions. The scattering properties of the medium are described by the scattering phase function ϕ(Ω′, Ω), which gives the probability that a ray coming from one direction Ω′ is scattered into the direction Ω. The phase function ϕ(Ω′, Ω) satisfies:
Radiative intensity in a given direction is attenuated and augmented by scattering:
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