Joey Q. answered 11/02/19
Hey! I'm a college student who loves reading, film, and teaching.
The motion capture suit has tracking points on it that helps the post-production team fit the movement and emotions of Mark Ruffalo onto the Hulk model. The data from the suit (and tracking dots put on Ruffalo's face) track motion that can be used as data for the post team to easily transfer to the model. This is so the team doesn't have to move everything manually, and instead make minor adjustments.