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During the life of a vehicle its tyres project a considerable amount of particles against the car underbody as well as to car body visible parts: the “stone chipping” effect is a significant source of corrosion of an automotive underbody along with undesired unaesthetic effects. Deposition of protective films counteracts the effects of the particles but protective coating extension and layout is somewhat driven by the experience. An actual simulation of the stone impact is then useful in order to design both coating thickness and layout. Nevertheless, even if the simulation of a single particle is, with reasonable simplifications, a quite straightforward task, the simulation of an actual impact of a real set of particles is almost impossible to attack due to the very large number of particles involved in the process and their mutual interactions.