Snerp
1568993538
but it is not JUST the shader its also some clever modeling/viseme configuration on my part. The shortest way I can explain what it is doing is something of a non-ZTested portal effect. For the mouth at least, there is a material set to a mask that simply hides the head material and reveals the mouth material sitting just behind it, and the visemes mainly control the shape and size of that mask to give the illusion of a mouth opening.
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