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POHow to balance start time for a multiplayer game?
 

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  1. POHow to balance start time for a multiplayer game?
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    <p>I'm making a multiplayer game with GameKit. My issue is that when two devices are connected the game starts running with a slight time difference. On of the devices starts running the game a bit later. But this is not what i want. i want it to start simultaneously on both devices. So the first thing that i do is i check time of the beginning on both devices like this:</p> <pre><code>startTime = [NSDate timeIntervalSinceReferenceDate]; </code></pre> <p>and this is how it looks:</p> <pre><code>361194394.193559 </code></pre> <p>Then I send <code>startTime</code> value to the other device and then i compare received value with startTime of the other device. </p> <pre><code>- (void)balanceTime:(double)partnerTime { double time_diff = startTime - partnerTime; if (time_diff &lt; 0) startTimeOut = -time_diff; } </code></pre> <p>So if difference between two start times is negative it means that this device is starting earlier and therefore it has to wait for exactly the difference assigned to <code>startTimeOut</code> variable, which is a <code>double</code> and usually is something like <code>2.602417</code>. So then i pause my game in my update method </p> <pre><code>- (void)update:(ccTime)dt { if (startTimeOut &gt; 0) { NSLog(@"START TIME OUT %f", startTimeOut); startTimeOut -= dt; return; } } </code></pre> <p>But it unfortunately it doesn't help. Moreover it even extends the difference between start times of the devices. I just can't get why. Seems like everything i'm doing is reasonable. What am i doing wrong? How do i correct it? What would you do? Thanks a lot</p>
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    1. USAtulkumar V. Jain
    1. USAndrey Chernukha
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      1. POHow to balance start time for a multiplayer game?
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    1. COThe time on the two devices can be totally different, so this solution will not work for you.
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      1. POHow to balance start time for a multiplayer game?
      1. USMike Weller
    2. CObut why? i refer to [NSDate timeIntervalSinceReferenceDate]; which is absolute for both devices, so it must work
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      1. POHow to balance start time for a multiplayer game?
      1. USAndrey Chernukha
    3. COHow did you get that? "Returns the interval between the receiver and the first instant of 1 January 2001, GMT."
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      1. POHow to balance start time for a multiplayer game?
      1. USTheAmateurProgrammer
 

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