DART-Ray: Ray-tracing 3D dust radiative transfer in galaxies Giovanni Natale (University of Central Lancashire) Abstract : Modelling the propagation of light in dusty galaxies is necessary to derive the attenuation of stellar radiation at optical/UV wavelengths, the corresponding dust re-emission in the infrared regime as well as the intensity of the galaxy interstellar radiation field. In the first part of this talk, I will give a brief introduction to dust radiative transfer. I will then introduce the main features of "DART-Ray", a new 3D ray-tracing radiative transfer code, which is specifically designed for the calculation of radiation field energy density distributions in dusty galaxies with arbitrary geometries. Finally, I will show some applications of the code to spiral disk galaxy models.