Blend shape deformers let you change the shape of one object into the shapes of other objects, deforming a surface into the shapes of other surfaces. You can blend shapes with the same or a number of vertices (or CVs). In character setup, a typical use of a blend shape deformer is to set up poses for facial animation.
Unlike other deformers, the blend shape deformer has an editor that lets you control all the blend shape deformers in your scene. You can use the editor to control the influence of the targets of each blend shape deformer, create new blend shape deformers, set keys, and so on. See Blend Shape Editor.
When creating a blend shape deformer, you identify one or more objects whose shapes you want to use to deform the shape of some other object. Objects whose shapes you want to use to deform the shape of another object are called target objects, and the object being deformed is called the base object. See Target shapes, base shapes, and blend shapes.
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