There is something that I can't understand about the "Weight Paint".
I was testing some stuff with a few Models, I need to decimate and fix this one for VRchat, but how does the original model rotating all parts so smoothly?
For example, when I rotate the Head bone of the Original upwards, the head looks nice and it seems to stretch all vertices nearby even if the weight of those are "0". That gives is a smooth look.
When trying that on my version of model with an almost self-made Rig, it only affects the vertices that are painted. This deforms my model in an unexpected way.
I made 2 screenshots for an example:
Why does the head of the original affect all those vertices on the neck with 0 weight and stretch them slightly, while on my version its just pulling on the painted ones?