Shapes for head models are created using software external to MotionBuilder, then imported using the File > Import function.
Techniques for creating shapes may differ between software. For example, some 3D software may require that you save each shape on the head model at different frames. In others, you create duplicates of your head model with different shapes.
In general, when creating a shape, start with a copy of the facial rest pose so that each shape starts from the same rest position. Then when you create transitions between facial expressions, the shapes blend together smoothly because they are all created from the same basic template.
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