For a long time 3D radiative MHD simulations of sunspots were out of reach. With increasing computing power there has been recently substan-tial progress in modeling magneto-convection in strong magnetic field regions and complete sunspots including the transition from umbra toward plage-like solar granulation. 3D simulations point toward a unified understanding of sunspot fine structure in terms of a magneto convection process in a background field with varying inclination angle. We summarize here briefly the most recent de-velopments.
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