Diffraction task solution for lighting simulation inside ink layer

One approach to the problem of lighting simulation inside of ink or paint layer is described. The problem arose in the task of rendering of ink basing on information about shape of ink pigments and layer structure. High pigment volume concentration characterizes ink layer structure. Ray tracing or LTE are hardly applicable here. Therefore it was decided to solve it as a diffraction problem basing on wave optics methods. The solution of corresponding diffraction task is considered in the article.