Fig. 16.

A depiction of the boundary calculation for overlapping spheres and Voronoi tessellation. The solid black dot represents the cell’s centre, the solid black circle/lines the cell’s boundary, the dashed grey circle the cell-pixel interaction radius, $r_{\text{cell-pixel}}$, and the dashed blue circle the extended cell-pixel interaction radius, $r_{\text{cell-pixel}}^E$. The red squares are the discrete pixel mesh (Color figure online)