>> 1. load position data from the previous frame
>> 2. calculate (and draw) new positions
>> 3. save new positions to file [overwriting what's there]
> 
> 
> Doesn't this fail kind of irrecoverably if you have to restart the 
> animation for some reason? Would it not be better to save each state to 
> a different file, so you can pick up in the middle?

Well, yeah, that's doable also...

...as is computing *all* the data for the entire animation during the 
parsing of frame 1, and reading it back thereafter. (Not sure if this 
would gain you anything - possibly less overhead in parsing input files.)

...or any other combination that takes your fancy. ;-)

Andrew @ home.

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