Phase function
Any phase function may be used with the Monte Carlo method. A
normalized phase function describes the probability density function for the angle
at which a photon is scattered. Anisotropic scattering is characterized by a non-
uniform density function. Random scattering angles with non-uniform
distributions may be generated
using the techniques of Appendix A. Generating functions for isotropic,
Henyey-Greenstein, and modified Henyey-Greenstein phase functions are given
in this appendix.
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