  The breakout of a supernova blast wave from its progenitor star provides
strong constraints on the star and its immediate surroundings. These
surroundings are shaped by mass loss from the star and can include a wide
variety of inhomogeneities. Here we present results of multi-dimensional
radiation-hydrodynamics calculations of the interactions of the supernova blast
wave with inhomogeneities in the immediate surroundings of a massive Wolf-Rayet
star, calculating the effect these interactions have on the shock breakout
signal from supernovae.
