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We introduce a new model for the spectral energy distribution of galaxies,GRASIL-3D, which includes a careful modelling of the dust component of theinterstellar medium. GRASIL-3D is an entirely new model based on the formalismof an existing and widely applied spectrophotometric model, GRASIL, butspecifically designed to be interfaced with galaxies with any arbitrarily givengeometry, such as galaxies calculated by theoretical hydrodynamical galaxyformation codes. GRASIL-3D is designed to separately treat radiative transferin molecular clouds and in the diffuse cirrus component. The code has a generalapplicability to the outputs of simulated galaxies, either from Lagrangian orEulerian hydrodynamic codes. As an application, the new model has beeninterfaced to the P-DEVA and GASOLINE smoothed-particle hydrodynamic codes, andhas been used to calculate the spectral energy distribution for a variety ofsimulated galaxies from UV to sub-millimeter wavelengths, whose comparison withobservational data gives encouraging results. In addition, GRASIL-3D allows 2Dimages of such galaxies to be obtained, at several angles and in differentbands.

GRASIL-3D: an Implemention of Dust Effects in the SEDs of Simulated Galaxies