  A revised and greatly improved version of the 3D continuum radiative transfer
code MC3D is presented. It is based on the Monte-Carlo method and solves the
radiative transfer problem self-consistently. It is designed for the simulation
of dust temperatures in arbitrary geometric configurations and the resulting
observables: spectral energy distributions, wavelength-dependent images, and
polarization maps. The main objective is the investigation of
``dust-dominated'' astrophysical systems such as young stellar objects
surrounded by an optically thick circumstellar disk and an optically thin(ner)
envelope, debris disks around more evolved stars, asymptotic giant branch
stars, the dust component of the interstellar medium, and active galactic
nuclei.
