Re: [GD-General] Sports Game Replay

[Jamie F. <ja...@qu...>]

That is the standard way to do it (of course, you only need to record 
the player inputs, everything else should drop out of the simulation; 
certainly this is the way we did it in Driver), although it can be a bit 
of a nightmare to get it working and keep it working. If you can spare 
the memory, you can add extra data to help keep the thing looking like a 
replay even when it fails, but that may or may not really help (and will 
almost certainly cover any bugs in the proper replay code).

Things to watch out for:

- If you have time delta dependent code, you need to replicate the 
deltas as well.
- Initialize all class members properly, or you'll get different 
behaviour on replay.
- Make sure you test multiple game cycles from early on, i.e. frontend 
-> game -> frontend -> game.
- It's one of the areas which is amenable to automated unit and 
regression testing.
- Random numbers can be bad. If you're using them, make sure you 
reinitialize with the right seed.

Hmmm, that's about all that floats to the top of my brain at the mo.

Jamie


Brett Bibby wrote:
> Hiya,
> I think this is as good place as any to post this...
> 
> We're just starting a new sports game project, and we have been asked to
> provide replays of the action.  We have done many sports games before, but
> oddly none had a replay feature (was never requested before by publisher).
> Anyways, can anybody provide any tips or insights into things we need to
> watch out for or methods to support this feature?
> 
> The game needs to run on the PS2 so memory and IO is limited.  Our
> characters use virtual controllers for all the movement so is it naive to
> just compress and store controller inputs for everything and then rerun the
> simulation with that?
> 
> Cheers,
> -bb
> 
> 
> 
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