This is for identifying any geometry mesh changes during dependency data collecting process in publish, in Maya.
Especially when publishing lookDev/Rig.
Artist often needs to work on modeling and look developing all together, which means the working model often not being the published one. And in publish process, system may not know which version of model is the dependency of current look.
To solve this kind of problem, we need to generate hashcode that based on target's feature. Take model as example, the hash function would based on mesh vertex position, normal, and UV.
With that hashcode saved with model verison data in database, we can verify look's model with previous version's hashcode to see if it's unchanged and matched the latest version of subset.