  The radiation hydrodynamics equations for smoothed particle hydrodynamics are
derived by operator splitting the radiation and hydrodynamics terms, including
necessary terms for material motion, and discretizing each of the sets of
equations separately in time and space. The implicit radiative transfer
discussed in the first paper of this series is coupled to explicit smoothed
particle hydrodynamics. The result is a multi-material meshless radiation
hydrodynamics code with arbitrary opacities and equations of state that
performs well for problems with significant material motion. The code converges
with second-order accuracy in space and first-order accuracy in time to the
semianalytic solution for the Lowrie radiative shock problem and has
competitive performance compared to a mesh-based radiation hydrodynamics code
for a multi-material problem in two dimensions and an ablation problem inspired
by inertial confinement fusion in two and three dimensions.
