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mrays is a Mathematica package that can be used to determine refraction of a point light source over a surface determined either in functional or parametric form. It only considers single refraction events and deals with total internal reflection in a very limited fashion.
The surfaces can be determined either as curves of the for z[y] or as surfaces of the form z[x,y]. It can also deal with curves given in parametric form {z[θ], y[θ]} or surfaces of the form {x[θ, ϕ], y[θ, ϕ], z[θ, ϕ]}.
