to summarise - convert to vdb, do a volume point sample. multiply the normal of the geo by the volume sample and then add back to the original position. It should push in -or out- for a packed cushiony effect.
nicely demo'd here by
Emīls Geršinskis - Ješinskis
https://www.youtube.com/watch?v=2yGxLHSYf8I
