I'd like to simulate balloons floating up, while other objects are falling down, which I cannot fix by reversing gravity. Is there any way to simulate this, simulating Archimedes' Law?
This is more of a general question about Blenders physics, but for the scene at hand I'm working on about a hundred balloons rising, and confetti and serpentines falling. The balloons have numbers on 'm, so these were generate through a script. It is not a particle system.