http://www.demul.net/frits/Monte-Carlo.htmlMonte-Carlosimulationsoflighttransportintransparentorturbidmedia,liketissue,withScattering,Absorption,Fluorescence,Raman,Laser-DopplerandPhoto-acoustics,withlayersandobjectslikespheres,tubes,cones,mirrors,lenses,pupils,diaphragms.