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Originally Posted by cbk1994
Any time you're guessing where other players are going to be (extrapolation) or even showing players in slightly older positions (interpolation), you're changing where the player sees them and affecting the spar. Interpolation would be nice for most uses in Graal, but with spars, I'd prefer it to be off, especially since hit detection is done clientside by the victim player.
Good sparrers already essentially extrapolate (guess) a player's new position in their heads if that person is lagging (especially on Era) and move or attack to try to hit them there.
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This is true, but I think one or two frames of extrapolation would do fine for everybody. Beyond those two frames, it might make sense to actually freeze both players until the connection is restored. Unfortunately, that's the only solution I can think of for sparring. It could be as short as one frame, but if it exceeds a certain threshold you could even cancel the match. Fighting games do it all the time, SFIV and UMvC3. They also cache positions and snap back in time a few frames if there's some kind of paradox (This is only true for fighting games that do any kind of prediction at all; SFIV and UMvC3 don't seem to do any prediction).
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Other than rendering players at a position even further away in comparison to where they see themself, it would also cause some confusion due to the fact that players alternate their style according to how skippy other players appear to me. If a player appears to move smoothly you're more inclined to believe you should slash closer to the position inwhich you see them, even though the opposite would be more true.
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Graal already trusts the victim client 100%, so there's no reason not to trust the attacking client. You could just as easily have either the server or player get the positions that were dropped and hit the player, even though on the victims client they skipped over the slice, but were visibly getting attacked on the attacker's client.
This is all a lot of work, though, and personally, I wouldn't do it just because Graal is Graal and it's not exactly competitive anyway.