Object interaction simulation.

Im working on a complex project where individual text items interact with one another.  Im fighting with repel to simulate solids interacting.  Its a shame we can't just make object "solid" so that they "hit" and bounce off etc.  But if repel is all we have, does anyone have settings that simulate solid object interaction?  This trial and error is killing me. 
FYI - using gravity to set the objects in motion, follow motion path to simulate interaction with the floor, now just need repel settings to hopefully simulate interaction among the objects so that hopefully they only react as though they "touch" but don't allow individual object to overlap.
Any help appriciated.
Jeff

jp,
Yep, you're missing a whole concept in your model.
I'd say a Person signs-up to bid at an Auction, at which point they become a Bidder, and are given a (unique) number. The "role" is closed before bidding commences.
Setup...
* An Auction has one-to-many Lots.
* A Person signs-up as a Bidder at an Auction.
.... * I'd model it as a Bidder is-a Person.
.... * An Auction has-a finite set of Bidder's before bidding commences.
Bidding opens on a Lot...
* A Bidder bids an amount on a Lot... creating a Bid.
* A Bid on a Lot has a Bidder and an amount.
What you've got doesn't make much sense to me.
Things start going horribly wrong at Auction.bidFor(int lotNumber, Person bidder, long value)
I'd have something like Lot.placeBid(Bid bid) a bidder would place a bid by lot.placeBid(new Bid(this, amount))
That's just how it makes sense to me, at face value.
Cheers. Keith.

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