Wikipedia
FaceGen is a 3D face-generating 3D modeling middleware produced by Singular Inversions. It is used where there is a need for a large number of different possible faces, either at random or from photographs. The most notable examples of its use are for player character creation in Tiger Woods PGA Tour (photo game face), The Elder Scrolls IV: Oblivion and the Football Manager series, and for the character models used in Red vs. Blue season 9 and upwards.
It is also used by various police departments to make 3D models of suspects. According to the company, the software is far more useful in making police sketches than the various 2D software still being used in many places, due to its ability to render accurate 3D models of people with far more options to choose from, in order to create very detailed images.
Another use is stimulus generation for social psychology research. Advantages of its use (compared to using natural photos) is that a large number of stimuli can be generated easily, while the faces can be either matched or varied systematically on characteristics such as race, gender, and caricature, eye gaze, and head position.