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Context: Radiation-MHD simulations have become a standard tool to investigatethe physics of solar and stellar atmospheres. Aims: The aim of this paper topresent a method that allows efficient and accurate analysis of flows in suchsimulations in the Lagrangian frame. Methods: This paper presents a method thatallows the construction of pathlines given a seed point that can be chosenfreely at any location and at any time during the simulation where thesimulation state is stored. The method is based on passive tracer particles.Through injection of particles in expanding regions the occurrence ofparticle-free volumes is avoided, even in the case of strongly compressiveflows. Results:The method was implemented in the solar and stellar atmospheresimulation code Bifrost. It is efficient and accurate. As examples I present ananalysis of a gas parcel in the convection zone and a particle in the solartransition region.}

Tracing the evolution of radiation-MHD simulations of solar and stellar atmospheres in the Lagrangrian frame