Rest-mass density distribution for different grid resolutions (left: uniform cartesian 300³, centre: uniform cartesian 500³ and right: adaptive logarithmic 300³). Top row: entire simulation box and bottom row: zoom into the central region indicated by the dashed boxes in the top row. The adaptive grid is created using Δ(x, y, z)_{align,  min} = 10⁻³, (x, y, z)_scale = 4 and η_x, y, z = 1.15.