Intema and Mellema performed simulations of the gravitational collapse of a spherically symmetric, high-density gas cloud in a low-density environment, using the special metrical approach of the Roe-Eulderink-Mellema solver to implement self-gravity and a general non-linearly spaced grid. Although some problems still needed to be resolved, the method allowed succesgful simulation of the isothermal collapse of a one-solar-mass cloud until after the moment of core formation, with enhanced spatial resolution in the centre of the collapsing cloud.