Cameron explains that those captured performances are the key to making the CG or computer-generated digital characters that audiences see come 'alive.' "I don't want to be an animator.

VOA: standard.2009.12.19

Besides the actual performance, they look at how long it takes the soldiers to complete their tasks, since time can make the difference between survival or death for those who are lucky enough to be alive after the nuclear blast.

VOA: standard.2010.07.21