  Stellar evolution codes play a major role in present-day astrophysics, yet
they share common issues. In this work we seek to remedy some of those by the
use of results from realistic and highly detailed 3D hydrodynamical simulations
of stellar atmospheres. We have implemented a new temperature stratification
extracted directly from the 3D simulations into the Garching Stellar Evolution
Code to replace the simplified atmosphere normally used. Secondly, we have
implemented the use of a variable mixing-length parameter, which changes as a
function of the stellar surface gravity and temperature -- also derived from
the 3D simulations. Furthermore, to make our models consistent, we have
calculated new opacity tables to match the atmospheric simulations. Here, we
present the modified code and initial results on stellar evolution using it.
