FaceFX

FaceFX is a program developed by OC3 Entertainment. It was designed to create realistic lip synchronization from audio files in computer games.

Background
FaceFX is included in the Fallout 3 credits, Fallout: New Vegas Credits, and Fallout: New Vegas Wild Wasteland credits.

Behind the scenes
Joshua Sawyer stated that the masked NPCs in Fallout: New Vegas wore full-face outfits because FaceGen/FaceFX data was expensive and it cut down on the memory required.