In 26319440">vimeo.com/26319440 derya paints a Vertex Map to use in conjunction with a Plain Effector.

This screencast takes the technique a step further using a Shader Effector with an animated Noise and a Particle Emitter as the Source of the Falloff.
Combining the Plain Effector with the Shader Effector gives some interesting organic, wavy motion.

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