It's not just a digital recreation, it can involve physical acting as well. This article quotes a motion-capture performer:

Ms Jefferies told the BBC she was once asked to act out a scene with a male performer involving a sexual assault with no prior warning.

"I turned up and was told what I would be filming would be a graphic rape scene," she said.

"This act could be watched for as long or as little time as the player wanted through a window, and then a player would be able to shoot this character in the head.

"It was just purely gratuitous in my opinion."

She refused to act out the "disgusting" scene - which was made worse as she was the only female on set.

"There's no nudity involved, but its still an act and there's an intimacy in that act and also a violence in this situation," she said.

"So yes there may be a layer of Lycra between us, but you are still there and still having to truly immerse yourself in this scene."

In the end her concerns were listened to and the scene was not recorded.