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copied!<blockquote> <p>2) Should I progress the client side state far enough to count for the entire round trip, or just the time it takes to get the data from the server to the client?</p> </blockquote> <p>Let's assume that the server sends the state at time T0, the client sees it in time T1, the player reacts in time T2, and the server obtains their answer in time T3, and processes it instantly. Here, the round trip delay is T1-T0 + T3-T2. In an ideal world, T0=T1 and T2=T3, and the only delay between the observing time and the processing of the player's action is the player's reaction time, i.e., T2-T1. In the real world it's T3-T0. So in order to simulate the ideal world you need to subtract the whole round trip delay:</p> <pre><code>T2-T1 = T3-T0 + (T1-T0 + T3-T2) </code></pre> <p>This means that a player on a slower network sees more advanced state the a player on a fast network. However, this is no advantage for them, since it takes longer till their reaction gets processed. Of course, it could get funny in case of two players sitting next to each other and using different speed networks. But this is quite improbable scenario, isn't it?</p> <p>There's a problem with the whole procedure: You're extrapolating in the future and this may lead to nonsensical situations. Some of them, like diving into walls can be easily prevented, but those depending on player's interaction can not.<sup>1</sup></p> <p>Maybe you could turn your idea upside down: Instead of forecasting, try to evaluate player's action at the time T3 - (T1-T0 + T3-T2). If you determine that a character would be hit this way, reduce its hit points accordingly. This may be easier and more realistic then the original idea, or it may be worse, or not applicable at all. Just an idea.</p> <hr> <p><sup>1</sup> Imagine two players running against each other. According to the extrapolating they pass each other on the right side. In fact, one of them changes their direction, and at the end they passes each other on the left side.</p>

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