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Dynamic modeling of facial appearances and sight directions are demanded for HCI and multimedia applications. Traditional approaches for face tracking and eye tracking from 2D videos do not involve explicit facial modeling. In this paper, we propose to use an explicit 3D model to model the dynamic facial appearance as well as the eye shape to estimate the viewing direction. We apply active appearance models for local region tracking, and use a scale-space topographic representation for frame model instantiation. The individualized 3D models across video sequences allow us to estimate the iris viewing orientation dynamically. The proposed framework has been realized and tested in a person-independent fashion for AAM tracking and model instantiation using a single camera.