Estimate Grain Diameters gives an estimate of the grain sizes in the structure by fitting spheres into the structure and evaluating their diameters.

The algorithm is faster than Identify Grains but it does not provide any information about the single grains in the structure.

During the post-processing, you can identify different diameter classes and segment the structure with respect to them.

The example structure used to explain the parameters and show the results was created with GrainGeo.