Isolating the SMASH variable & the science of Benjamin Button

Benjamin Button TED Talk
The people making Benjamin Button's face went through a lot of steps. The science of Benjamin Button. They had to make the person acting Benjamin Button wear blue hats. (I think for the blue screen.) They took picture of every thing that Brad's face was able to do and use some kind of technology that uses white ball stuff to make the 3D face of Brad ((old),(Benjamin Button)).
They had a lot of different actors for Benjamin Button as person then they will stick the head of older Brad's.