The choices under the Grid tab are only possible if you select EJ as solver. The tab is deactivated when you select the LIR solver.

If boxels (cuboid) instead of voxels (cube) are used to resolve the structure, the boxel lengths can be set in the Grid tab.

Sometimes, grid lengths may be different in each direction, e.g., for Focused Ion Beam (FIB) images, the grid size in Z-direction is often different from the size in X- and Y-directions. For example, a structure is sampled in a computational grid with different lengths in X- and Y-direction (e.g. LX = 2*LY).

When the structure is loaded in GeoDict, each grid cell gets assigned 1 voxel and the visual representation of the structure looks stretched. To correct this effect, boxels set as e.g. LX = 1 µm and LY = 0.5 µm, need to be chosen in the Grid Size panel.