MULTI3D: A Domain-Decomposed 3D Radiative Transfer Code. We present MULTI3D, a 3D radiative transfer code currently under development. It is optimized for computing NLTE problems based on (radiation-)MHD models of stellar atmospheres. MULTI3D is based on MULTI and includes most of the physics present in that code. MULTI3D was first written as a serial code by Botnen (1997) and has recently been upgraded to an MPI-parallelized, domain-decomposed version. The code has so far successfully been run on up to 64 processors, solving the NLTE radiative transfer for a six-level Ca II atom with 400 frequency points in an atmosphere of 256 × 128 × 108 grid points.

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  1. Christopher M J Osborne, Ivan Milić: The Lightweaver Framework for NLTE Radiative Transfer in Python (2021) arXiv