Paul Debevec talks about the animation of a photo-real human face, using LightStage scanning and tools in Maya to achieve some amazing results. If you haven’t seen a version of the Lightstage system, you should – it looks like something from a star trek movie.

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Jason Osipa wrote the absolute definitive book for rigging and animating faces in maya, Stop Staring: Facial Modeling and Animation Done Right
>Stop Staring: Facial Modeling and Animation Done Right. This book is a must have for anyone wanting to understand the complexities of rigging and animating faces well, I really can’t say enough about this book.