Johan Billgren shows how to create a quick and simple effect where he uses emitters, the Cinema 4D Attractors along with Dynamics to build a scene where spherical objects will be emitted and crowd around a couple of cubes.

…A short tutorial showing how to use the atractor with dynamic bodies…

Typically the Attractor in Cinema 4D by default only effects emitters, however Johan shows how you can get around that and use the Attractor to effect dynamic objects.

Tutorial – attractor and emitter with dynamic bodies from Johan Billgren on Vimeo.