Traditionally, CGI characters such as Doctor Manhattan would require two shoots for every scene in which the character appears. First, the scene would be filmed with a placeholder instead of the CGI character, then the character's movements would be recorded on a "motion capture" stage to provide a reference in creating the CGI character. Given the amount of screen time Doctor Manhattan has, this would have been an expensive process. Instead, Billy Crudup simultaneously provided Manhattan's placeholder and motion capture on set. Crudup wore a specially-designed motion capture suit and face markers, and was constantly filmed by at least two cameras, one for all-over movement and another trained on his face to follow his expressions. This way, his on-set performance as the placeholder could be used directly in creating the CGI character. To provide the effect of Doctor Manhattan's eerie glow, Crudup's suit was studded with 2,500 blue lights, so that he could act as an "exotic lighting instrument". Therefore, Manhattan's glow follows his movements more closely than an on-set light could, and illuminates his surroundings in a more convincing manner than a computer effect would.

Film

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