  The irreversible growth of a binary mixture under far-from-equilibrium
conditions is studied in three-dimensional confined geometries of size $L_x
\times L_y \times L_z$, where $L_z \gg L_x = L_y$ is the growing direction. A
competing situation where two opposite surfaces prefer different species of the
mixture is analyzed. Due to this antisymmetric condition an interface between
the different species develops along the growing direction. Such interface
undergoes a localization-delocalization transition that is the precursor of a
wetting transition in the thermodynamic limit. Furthermore, the growing
interface also undergoes a concave-convex transition in the growth mode. So,
the system exhibits a multicritical wetting point where the growing interface
is almost flat and the interface between species is essentially localized at
the center of the film.
