I'll be going into more detail on facial shapes over the next few weeks.
Here's some reference for viseme based facial animation
These were brought to everyone's attention with Jason Osipa's book "Stop Staring" - a manual for creating viseme based facial animation, and though it came out some time ago, still well worth the purchase. These are the basic shapes he uses to creat the
It's interesting to see how CG rigs have evolved, and ultimately, how great facial animation comes down to planning and skill, despite the ease of use of rigs. From the old days, when we'd muscle through dozens of overlapping blendshapes, to the advent of GUI based rigs, and now to the on-face controls that make sculpting shapes such a treat, great animation really is in the hands of the person behind the mouse.
The super simple description of visemes is the shape the mouth makes when forming sounds, as contrasted to Phonomes, which are the pose a mouth takes when forming words. (I'll find better definitions for you on this)
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