The character animation is required to appear as natural as human motion. Toward that goal, there is an approach where the expression appears as natural as the human expression by adding gaze behavior to the contextual situation, and the environment to the general behavior animation [Grillon, H. et al. 2009].
['Hiroshi Mori', 'Tomoya Nakadai', 'Fubito Toyama', 'Kenji Shoji']
Gaze animation optimization based on a viewer's preference