[ODE] Randomness in ODE

[Thomas Harte]

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>ODE is completely deterministic, at least the parts that I'm using...

I believe that ODE is overwhelmingly deterministic, but that there may be some 
variations in floating point accuracy from one target (i.e. combination of processor and 
OS) to another. And my understanding of such things is that errors accumulate, right?

Actually, this fits in well to a question I was going to ask. For my game, I would like to 
implement a replay feature. Because of my belief as per the above, I do not think that 
simply replaying the user supplied input to the game engine will work - especially not if a 
saved replay is sent, e.g. from someone using a Windows PC to someone using a Mac. I 
have therefore decided to take the approach of storing orientation and position of 
bodies at a certain (high-ish) rate, and interpolating between those. Was this a bad 
decision? Would I notice massive jumps if I stored the input state, and then the state of 
every body just, say, once every second, and pushed the input into the game engine 
but forced the bodies to jump to the stored states at the correct intervals?

-Thomas

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