  We present a fully three-dimensional model providing initial conditions for
energy and net-baryon density distributions in heavy ion collisions at
arbitrary collision energy. The model includes the dynamical deceleration of
participating nucleons or valence quarks, depending on the implementation. The
duration of the deceleration continues until the string spanned between
colliding participants is assumed to thermalize, which is either after a fixed
proper time, or a fluctuating time depending on sampled final rapidities.
Energy is deposited in space-time along the string, which in general will span
a range of space-time rapidities and proper times. We study various observables
obtained directly from the initial state model, including net-baryon rapidity
distributions, 2-particle rapidity correlations, as well as the rapidity
decorrelation of the transverse geometry. Their dependence on the model
implementation and parameter values is investigated. We also present the
implementation of the model with 3+1 dimensional hydrodynamics, which involves
the addition of source terms that deposit energy and net-baryon densities
produced by the initial state model at proper times greater than the initial
time for the hydrodynamic simulation.
