You can use the RBD Fractured Object to create multiple RBD objects from your source geometry based on the ‘name’ primitive attribute or based on primitive groups.

The RBD Object DOP will create a single RBD Object from the entire source geometry, which causes the spheres to behave as one object.

For the effect you want, you can use the RBD Point Object DOP to create a separate RBD Object at each point of some source geometry. I've attached an example demonstrating how this can be done.

You'll want to use SIM_GeometryCopy (there's an example in the HDK docs of how to set this up as well).


SIM_GeometryCopy *geo = SIM_DATA_CREATE(obj, SIM_GEOMETRY_DATANAME, SIM_GeometryCopy, SIM_DATA_RETURN_EXISTING | SIM_DATA_ADOPT_EXISTING_ON_DELETE);

GU_DetailHandleAutoWriteLock gdl(geo->lockGeometry());

GU_Detail *gdp = gdl.getGdp();

geo->releaseGeometry();