The server then carries out the input and sends back a “picture” of the resulting world. The clients have (almost) no code, they are just dumb terminals sending input (key presses) to the server. The server has the game “world” and the clients just receive a view on this world.
To avoid having to wait on the slowest computer, each computer now communicates with a single server. Real Time Strategy games typically use variants of peer to peer lockstep, albeit with better handling of the lag issues. The disadvantage of this networking solution is that each computer has to wait until it has received the move from the last computer, the slowest computer thus determing the pace of the turns (and thus lag). Assuming that all computers started from the same initial game state, this would ensure that all games played out identically across computers. Once all the computers had communicated their next move to all the other computers, each computer carried out the moves after which it was time for the next turn. The game consisted of “turns” and in each turn a computer could choose from a limited number of “moves”. Initially, each computer exchanged game information with each of the other computers in a star topology. A brief history of networkingīefore diving into the networking solution that Unity offers, lets briefly look at the history of multiplayer games and their networking solutions.
lossy connections and the handling of lost dataįor real time games the above problems are especially relevant and if not handled correctly will result in players experiencing “lag”.differing network latency between players (round trip time), and differences in the variation thereof (jitter).players with differing connection speeds.players playing on differing hardware platforms (cpu/memory), such as pcs and mobiles.
This will require the handling of problems such as: If you are planning to make a multiplayer game in Unity, be it two player turn based or massive multiplayer online, you will have to implement some sort of networking solution capable of ensuring that all players share the same consistent world view.
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