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POIs it possible to do real time network games in Actionscript 3.0
 

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  1. POIs it possible to do real time network games in Actionscript 3.0
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    <p>Question: Is it possible to update 100+ objects in the Flash Player over Socket Connections? More details and my own try's below!</p> <p><strong>Details</strong></p> <p>For my internship I got the time to create a multiplayer physics game. I worked for a steady three months on it. My internship is coming to an end and I couldn't finish my game.</p> <p>My problem is that its hard to send multiple packets each time-step to the server and back. The packets I send are position updates of the objects and mouse of other clients.</p> <p>I will try to explain the network/game flow.</p> <ol> <li>Client connects to the server using the binary Socket class in AS3</li> <li>Server ask for verification and client sends name and thumbnail.</li> <li>Server waits until 4 clients are connected (Some matchmaking etc)</li> <li>Server picks 4 clients and makes them run on a separate Thread(Combined as a Team)</li> <li>Client sends his performance score to the server range 1-100.</li> <li>Server makes the best client the host machine for the physics and the other 3 slaves</li> <li>Host game sets up the level and makes around 1-100 shapes in the level(primary shapes and complex shapes like bridges, motors, springs)</li> <li>Every time-step the host gets all updated property's of the shapes and sends them to the clients (x, y, rotation, sleep)</li> <li>The client applys all the shape property's to the correct shapes</li> </ol> <p>I tried different time-steps and noticed that until a time-step of 1/15 second the client(slave) won't notice any lagging in the game. I also tried to pick a lower time-step and tween the movement of the shapes but that did give some strange movement on the client(slave) side.</p> <p>I will give an example of a single object update packet.</p> <pre><code>&lt;O|t=s:u|x=201|y=202|f=automaticoo&lt;/O &lt;O|t=m:p|x=100|y=345|f=automaticoo&lt;/O </code></pre> <p>I noticed that the Flash Player can stack a lot of packets in the buffer before sending. For example if I send a lot of packets at once it stacks them up and send them together to the server. With faster time-steps you don't get more updates on the client(slave) side but more updates in the same packet row.</p> <p><strong>Tries</strong></p> <ol> <li>Use the new RTMFP(udp &amp; p2p) protocol for updates. (little bit better in performance but less in reliability)</li> <li>Code my entire socket server in c++ instead of Air(with the ServerSocket) (better in performance but noticed the lagging part is not the server but the Flash Player)</li> <li>Use the ByteArray compress method and the AMF serialized format (performance about the same except the c++ server can't unserialize the messages)</li> </ol> <p>Do you guys think it is possible in the Flash Player too handle so many update request each time-step.</p> <p><strong>Discoveries</strong></p> <p>There is a stick arena game that is multiplayer in ActionScript 3.0. They used a lot of tricking and even then I get a ping of about 300ms and it only updates the players constantly (4 players in a lobby).</p> <p>Sorry for the long post.</p>
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    1. CODoes the host send data to other clients via server? Then clients are getting double round trip time compared to that if server computed the physics.
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    2. COThe only diffence from 1client->server->3client to server->4clients is that there is one client sending packets instead of receiving them. I made the decision once to calculate the physics on the client side because it offloads the server a lot when there are a lot of games going on. Maybe you are right and could I better do the physics in c++ on the server side.
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    3. COI wonder if client can send data directly to others (and with broadcast). AIR already has some p2p capabilities, not sure about in-browser Flash.
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