X-Particles Rippling Particle Radius

Rippling radius refers to the radius of a particle changing based on a neighboring particle. Effectively growing and shrinking over time. Just like dominoes, you trigger a start point and things cascade from there. You can view the full explanation in the free video tutorial that will show you how to build this effect.

This Cinema4D project file has a Control Options null object to help set the scale up/down rate and the max radius. You can set them manually, but the controller makes it a bit faster to set all parameters at once.