Hey AntXXX18,
I got some really helpful information from some of the devs and their suggestions are using IK’s.
"Pulling off what’s in that video is a two parter, as I see it. One is getting the hand to reach for the door knob when in range of it. There’d be a bunch of tweaking to make that not look really funny. You don’t want crazy magnetic arm tentacle behavior. The second part is actually opening the door. I would have assumed the door was a skeletal mesh where the hinges are the joint between the door’s bone and the frame’s bone. You probably don’t really want that to be physics driven either. You want controlled, predictable, reliable smooth movement.
IK is definitely how you want to get the arm movement. Getting the door to swing open nicely and progressively, that’s going to take some experimenting.
You get all kinds of edge cases, because the door can be anywhere between fully shut and fully open and a character can stop moving at any point. My best guess is to do something with the character’s proximity to the door. Not wacky inflatable arm man punching the door open."
This was the information they provided, so hopefully you can get started in the right direction.
Cheers,