jiggle deformer
 
 
 

A deformer that causes points on a surface or curve to shake as they move, speed up, or slow down. Jiggle deformers help you create effects such as a wrestler's stomach shaking, hair jiggling, or an insect's antennae vibrating.

You can apply jiggle to entire objects or to specific points (CVs, lattice points, or the vertices of polygonal or subdivision surfaces).

See deformer.