Overview of the different phases of the model. In the initial prestellar (static) phase, the physical conditions are inferred previous simulations and observations (e.g., Keto & Caselli 2008). In the pre-collapse phase, which has a fixed duration of 100 kyr, the physical evolution is derived from RAMSES, but since the protostar is not yet formed, no radiative transfer is performed. During the collapse, the physical evolution is derived from RAMSES and post-processed using RADMC-3D. The duration of the collapse varies between individual tracer particles, with an upper duration of ~ 250 kyr.