Henyey–Greenstein phase function

The Henyey–Greenstein phase function is a mathematical model used to approximate the angular distribution of light scattered by particles. First introduced by Louis Henyey and Jesse Greenstein in 1941 to simulate the scattering of light by interstellar dust, the function has since become a standard tool in radiative transfer, atmospheric optics, biomedical imaging, and computer graphics.

It is particularly valued for its ability to represent strongly forward-scattering media (such as biological tissue or clouds) using a single parameter, the asymmetry factor (), without requiring the computational complexity of full Mie theory.

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