For the Scale tool, you can choose between Tri-Linear or Nearest Neighbor interpolation. These are both methods of multivariate interpolation in one or more dimensions.

The Boxel Lengths refer to the current lengths in the structure model, in the three directions. These values are automatically entered based on the Voxel Length defined by the user at the bottom of the Import Images dialog.

For example, in FIB-SEM scans, the length in the Z-direction typically differs from the other two directions. It corresponds to the spacing between images. This spacing is defined when the FIB-SEM images are acquired and should be included with the image files as data. Importing the stack directly without accounting for spacing distortion results in a stacked structure that does not replicate the original scan.

To account for this distortion in the Z-direction, enter the length and click Apply. GeoDict will then scale the voxels in that direction and complete the missing slices to create a uniform object. The size of the scaled object will change to reflect the fill-in.

The Re-sampled Length value is used to uniformly re-sample the physical structure size (voxel length) in all directions with a grid adapted to the re-sampled length value. This process either coarsens or refines the imported structure.

Observe the difference between the two interpolation methods for the Scale tool in the following example. Although the number of voxels is the same for both, Tri-Linear interpolates gray values for a smoother transition.