Clusters are moveable sections of geometry on a face model that are set up to mimic the movement of muscle under skin and define the appearance of the face.
Cluster shapes are simply groups of clusters. When blended together, they create realistic facial expressions.
Clusters appear on a head model
You create clusters on a head model using MotionBuilder-compatible modeling software. Using a Character Face asset in MotionBuilder, you then group clusters together to create cluster shapes which can be mapped to custom or generic expressions. Model your cluster shapes to correspond with Generic and Voice channels, as you would ordinary generic and phoneme shapes.
