Theoretical shadow images of 2D non-spherical shapes are calculated using a diffraction model based on angular spectrum theory. Particle stats (diameter, area fraction, greyscale ratios etc) are output as a function of Z (position between probe arms)
References
https://amt.copernicus.org/articles/12/2513/2019/
https://amt.copernicus.org/articles/14/1917/2021/amt-14-1917-2021.html