On Iron Man, Favreau used previs as a medium to experiment and a way to get ideas evaluated. For him, previs was a “template,” but not the movie itself.
The challenge of creating the digital Iron Man suit included interpenetration and range of motion. The solution had to satisfy the need for appearance of realism while retaining necessary range of motion.
Iron Man used Pixel Liberation Front's entire visualization toolset from pre-production to post for 19 months with a total team size of 25 individuals.