I understand, sorry that you spent so much time searching, with no avail. I found this topic which talks about this:
Also either the paper or the thesis will have detailed information about the smoothing applied during conversion:
Pinter, C., Lasso, A., & Fichtinger, G. (2019). Polymorph segmentation representation for medical image computing. Computer Methods and Programs in Biomedicine, 171, 19–26. Redirecting
(https://labs.cs.queensu.ca/perklab/wp-content/uploads/sites/3/2024/02/Pinter2019_Manuscript.pdf)
Let us know if you still haven’t found the answer you’re looking for.