So how does transferring rigged meshes work?

Ispheria

Like I'm pretty sure that if you make a simple rig in a program and transfer it to another, the bones and weights will be fine, but what about stuff like user channels, channel links, stuff like that? And how well do those things transfer to game engines? Like I know you can do some simple animation fixes in UE4, but what about if your fingers are controlled by a user channel that rotates all those bones at the same time? 

thomasp

generally all you can transfer with openly available formats like FBX is bones and vertex weights, not control rigs or app specific functionality. if you export to a game engine then the animation done with those gets baked down to the bones they influence.

a lot of rigs use multiple layers of skeletons and controls where the animator interacts with a rig that essentially drives the skeleton that gets exported to game and does not touch the actual bones the vertices are weighted to.

Ispheria

Ok thanks for the info