This class introduces the unstructured mesh capability in MCNP6 and the Attila4MC problem-setup Graphical User Interface (GUI) from Silver Fir Software and then proceeds with advanced topics. In this class, the participant will learn how to take 3-D geometries developed using CAD software, import these CAD geometries into Attila4MC, mesh the geometry, setup the entire MCNP6 input file with the GUI, and run the calculation using the MCNP6 unstructured mesh capability.