There are a lot of physical and technical problems that need to calculate photon density distribution functions for the photon flow passing materials of different type. This flow can be described by a type of transport equations similar to the Boltzmann equation. Notwithstanding the huge number of equation types depending upon the particularities of the photon-matter interactions, the main properties of their trajectories are similar. Therefore it is possible to find a generalized model description for the photon trajectories which can be used to solve a large number of other problems.