That approach might be more use for finer detail like skin folds rather than large scale muscle movements. In his book Stop Staring Jason Ospira demonstrated using a displacement map hooked up in Maya to control brow wrinkles for frown expressions. So I'm thinking of areas that need fine dynamic detail like hands, faces etc where that level of detail would be harder to model in and deal with in rigging. Don't know if that would be a practical approach though - could a displacement map be applied as a kind of decal, like applying a tattoo to a figure?

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