Digital kung-fu fighters and face replacement for the one"

Jet Li plays a police officer pursued by his evil alterego from a parallel universe who seeks to kill him and become "The One." Advanced face-replacement techniques allow Li to fight his twin. Both faces are visible and fully expressive in close-ups. In the "chorus line" fight scene, Li's superhuman velocity is conveyed by individually slowing the CG cop opponents while he moves at normal speed. Kleiser-Walczak used tracking software by Yannix, Maya for modeling and animation, Shake for retiming and compositing, and custom plug-ins co-developed with kolektiv.com.