Here's how it worked:
* Motion Capture: Actors wore special suits with markers that tracked their movements. This data was then used to create the digital avatars in the film.
* Facial Capture: Cameras captured the actors' facial expressions, which were also used to animate the avatars.
* Voice Acting: The actors provided the voices for their characters.
So, while you see the blue avatars in the film, those are entirely digital creations based on the real-life performances of the actors. The actors themselves were not transformed into the avatars in any way.