Interaction of test particles with impulsive gravitational waves

We summarize methods of construction of spacetimes with nonexpanding impulsive gravitational waves, in particular, limit case of Kundt family including gyratonic spa- cetimes. Subsequently, using C1 -matching procedure leading to refraction formulae of geodesic trajectories crossing the impulsive hypersurfaces, we study behaviour of free test particles. We conduct a physical analysis and a visualisation of geodesic motion for selected spacetimes of our interest. As a part of this work we created a Python pro- gramming language package GRImpulsiveWaves for interactive visualisation of geodesic motion based on refraction formulae.