[Closed] SDK: modifier notified about mesh changes

Hi,
I’m trying to figure out how to get know if the mesh (with few modifiers and my custom mod on the top) changed in some way. I need to know when the vertex selection changed, then update some arrays etc. I’m looking on the NotifyInputChanged method which has PartID parameter, but it contains some weird values, when I’m changing vert selection with MeshSelect or VolumeSelect modifier below I’m getting “51” signal, but when the Vol.Select’s volume mesh object is animated and changing my vert selection over time I always get “-1” signal when I play the animation. How should I do it?