I've got a tower of bricks in DOPs being collapsed a Magnet force, which itself references metaballs in a geometry node. At the moment the metaballs are static and don't move with the collapsing bricks, which is fine but I'd like to activate each metaball force at different times during the simulation, so it's best if they follow the simulated objects. How do I ‘attach’ the metaballs to certain bricks as they collapse so that the force they create moves with these bricks?

Is it effectively a constraint I need to set up (in which case I'm not sure that the constraint geometry required by the Bullet solver will work) or is there a simpler way? I don't need the metaballs to participate in the RBD simulation other than act sources of force to be applied to the RBD objects.

Thanks in advance,

Andrew