The angular distribution of light scattered from small particles is described by the Henyey-Greenstein model. A user-defined DLL is included with the ZEMAX installation which allows users to apply this bulk scattering model to any non-sequential volume.

References

1http://www.nmr.mgh.harvard.edu/~adunn/papers/dissertation/node54.html
2http://omlc.ogi.edu/classroom/ece532/class3/hg.html