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<!DOCTYPE html>
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<title>Introduction - Documentation</title>
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<h2 class="home"><a href="index.html">Lance</a></h2><h2>Concepts</h2><ul class="tutorials"><li><span class='category'>Introduction<ul><li><a href="tutorial-introduction.html">Introduction</a></li><li><a href="tutorial-introduction_prologue.html">Prologue</a></li><li><a href="tutorial-introduction_community.html">Community</a></li><li><a href="tutorial-introduction_roadmap.html">Development Roadmap</a></li><li><a href="tutorial-introduction_faq.html">Frequently Asked Questions</a></li></ul></li><li><span class='category'>Overview<ul><li><a href="tutorial-overview_architecture.html">Architecture of a Multiplayer Game</a></li><li><a href="tutorial-choosing_a_physics_engine.html">Choosing a Physics Engine</a></li><li><a href="tutorial-guide_gameengine.html">Game Engine</a></li><li><a href="tutorial-guide_serverengine.html">Server Engine</a></li><li><a href="tutorial-guide_clientengine.html">Client Engine</a></li><li><a href="tutorial-guide_renderer.html">Renderer</a></li><li><a href="tutorial-guide_gameworld.html">Game World and Game Objects</a></li><li><a href="tutorial-guide_serialization.html">Serialization and Communication</a></li></ul></li><li><span class='category'>Synchronization Methods<ul><li><a href="tutorial-guide_syncinterpolation.html">Interpolation</a></li><li><a href="tutorial-guide_syncextrapolation.html">Extrapolation</a></li></ul></li><li><span class='category'>Tutorials<ul><li><a href="tutorial-MyFirstGame.html">My First Game: Pong</a></li><li><a href="tutorial-spaceships.html">Spaaace</a></li></ul></li><li><span class='category'>Extras<ul><li><a href="tutorial-guide_tuningdebugging.html">Fine Tuning and Debugging</a></li><li><a href="tutorial-furtherreading.html">Further Reading</a></li></ul></li></ul><h2>API Reference</h2><h3 class="classes">Classes</h3><ul><li><a href="AFrameRenderer.html">AFrameRenderer</a><ul class='methods'><li data-type='method'><a href="AFrameRenderer.html#draw">draw</a></li><li data-type='method'><a href="AFrameRenderer.html#init">init</a></li></ul></li><li><a href="BaseTypes.html">BaseTypes</a></li><li><a href="CannonPhysicsEngine.html">CannonPhysicsEngine</a></li><li><a href="ClientEngine.html">ClientEngine</a><ul class='methods'><li data-type='method'><a href="ClientEngine.html#connect">connect</a></li><li data-type='method'><a href="ClientEngine.html#disconnect">disconnect</a></li><li data-type='method'><a href="ClientEngine.html#sendInput">sendInput</a></li><li data-type='method'><a href="ClientEngine.html#start">start</a></li></ul></li><li><a href="DynamicObject.html">DynamicObject</a><ul class='methods'><li data-type='method'><a href="DynamicObject.html#bendingToString">bendingToString</a></li><li data-type='method'><a href="DynamicObject.html#toString">toString</a></li></ul></li><li><a href="GameEngine.html">GameEngine</a><ul class='methods'><li data-type='method'><a href="GameEngine.html#addObjectToWorld">addObjectToWorld</a></li><li data-type='method'><a href="GameEngine.html#getPlayerGameOverResult">getPlayerGameOverResult</a></li><li data-type='method'><a href="GameEngine.html#isOwnedByPlayer">isOwnedByPlayer</a></li><li data-type='method'><a href="GameEngine.html#on">on</a></li><li data-type='method'><a href="GameEngine.html#once">once</a></li><li data-type='method'><a href="GameEngine.html#processInput">processInput</a></li><li data-type='method'><a href="GameEngine.html#registerClasses">registerClasses</a></li><li data-type='method'><a href="GameEngine.html#removeListener">removeListener</a></li><li data-type='method'><a href="GameEngine.html#removeObjectFromWorld">removeObjectFromWorld</a></li><li data-type='method'><a href="GameEngine.html#start">start</a></li><li data-type='method'><a href="GameEngine.html#step">step</a></li></ul></li><li><a href="GameObject.html">GameObject</a><ul class='methods'><li data-type='method'><a href="GameObject.html#bendingToString">bendingToString</a></li><li data-type='method'><a href="GameObject.html#hasComponent">hasComponent</a></li><li data-type='method'><a href="GameObject.html#onAddToWorld">onAddToWorld</a></li><li data-type='method'><a href="GameObject.html#onRemoveFromWorld">onRemoveFromWorld</a></li><li data-type='method'><a href="GameObject.html#syncTo">syncTo</a></li><li data-type='method'><a href="GameObject.html#toString">toString</a></li></ul></li><li><a href="GameWorld.html">GameWorld</a><ul class='methods'><li data-type='method'><a href="GameWorld.html#addObject">addObject</a></li><li data-type='method'><a href="GameWorld.html#forEachObject">forEachObject</a></li><li data-type='method'><a href="GameWorld.html#getNewId">getNewId</a></li><li data-type='method'><a href="GameWorld.html#queryObject">queryObject</a></li><li data-type='method'><a href="GameWorld.html#queryObjects">queryObjects</a></li><li data-type='method'><a href="GameWorld.html#removeObject">removeObject</a></li></ul></li><li><a href="KeyboardControls.html">KeyboardControls</a></li><li><a href="PhysicalObject2D.html">PhysicalObject2D</a><ul class='methods'><li data-type='method'><a href="PhysicalObject2D.html#onAddToWorld">onAddToWorld</a></li><li data-type='method'><a href="PhysicalObject2D.html#toString">toString</a></li></ul></li><li><a href="PhysicalObject3D.html">PhysicalObject3D</a><ul class='methods'><li data-type='method'><a href="PhysicalObject3D.html#toString">toString</a></li></ul></li><li><a href="Quaternion.html">Quaternion</a><ul class='methods'><li data-type='method'><a href="Quaternion.html#conjugate">conjugate</a></li><li data-type='method'><a href="Quaternion.html#copy">copy</a></li><li data-type='method'><a href="Quaternion.html#multiply">multiply</a></li><li data-type='method'><a href="Quaternion.html#set">set</a></li><li data-type='method'><a href="Quaternion.html#setFromAxisAngle">setFromAxisAngle</a></li><li data-type='method'><a href="Quaternion.html#slerp">slerp</a></li><li data-type='method'><a href="Quaternion.html#toAxisAngle">toAxisAngle</a></li><li data-type='method'><a href="Quaternion.html#toString">toString</a></li></ul></li><li><a href="Renderer.html">Renderer</a><ul class='methods'><li data-type='method'><a href="Renderer.html#addObject">addObject</a></li><li data-type='method'><a href="Renderer.html#draw">draw</a></li><li data-type='method'><a href="Renderer.html#init">init</a></li><li data-type='method'><a href="Renderer.html#removeObject">removeObject</a></li><li data-type='method'><a href="Renderer.html#runClientStep">runClientStep</a></li><li data-type='method'><a href="Renderer.html#stop">stop</a></li></ul></li><li><a href="Serializer.html">Serializer</a><ul class='methods'><li data-type='method'><a href="Serializer.html#.typeCanAssign">typeCanAssign</a></li><li data-type='method'><a href="Serializer.html#addCustomType">addCustomType</a></li><li data-type='method'><a href="Serializer.html#registerClass">registerClass</a></li></ul></li><li><a href="ServerEngine.html">ServerEngine</a><ul class='methods'><li data-type='method'><a href="ServerEngine.html#gameStatus">gameStatus</a></li></ul></li><li><a href="SimplePhysicsEngine.html">SimplePhysicsEngine</a></li><li><a href="ThreeVector.html">ThreeVector</a><ul class='methods'><li data-type='method'><a href="ThreeVector.html#add">add</a></li><li data-type='method'><a href="ThreeVector.html#clone">clone</a></li><li data-type='method'><a href="ThreeVector.html#copy">copy</a></li><li data-type='method'><a href="ThreeVector.html#getBendingDelta">getBendingDelta</a></li><li data-type='method'><a href="ThreeVector.html#length">length</a></li><li data-type='method'><a href="ThreeVector.html#lerp">lerp</a></li><li data-type='method'><a href="ThreeVector.html#multiplyScalar">multiplyScalar</a></li><li data-type='method'><a href="ThreeVector.html#normalize">normalize</a></li><li data-type='method'><a href="ThreeVector.html#set">set</a></li><li data-type='method'><a href="ThreeVector.html#subtract">subtract</a></li><li data-type='method'><a href="ThreeVector.html#toString">toString</a></li></ul></li><li><a href="Trace.html">Trace</a></li><li><a href="TwoVector.html">TwoVector</a><ul class='methods'><li data-type='method'><a href="TwoVector.html#add">add</a></li><li data-type='method'><a href="TwoVector.html#clone">clone</a></li><li data-type='method'><a href="TwoVector.html#copy">copy</a></li><li data-type='method'><a href="TwoVector.html#getBendingDelta">getBendingDelta</a></li><li data-type='method'><a href="TwoVector.html#length">length</a></li><li data-type='method'><a href="TwoVector.html#lerp">lerp</a></li><li data-type='method'><a href="TwoVector.html#multiplyScalar">multiplyScalar</a></li><li data-type='method'><a href="TwoVector.html#normalize">normalize</a></li><li data-type='method'><a href="TwoVector.html#set">set</a></li><li data-type='method'><a href="TwoVector.html#subtract">subtract</a></li><li data-type='method'><a href="TwoVector.html#toString">toString</a></li></ul></li></ul><h3 class="events">Events</h3><ul><li><a href="GameEngine.html#event:client__postStep">client__postStep</a></li><li><a href="GameEngine.html#event:client__preStep">client__preStep</a></li><li><a href="GameEngine.html#event:client__processInput">client__processInput</a></li><li><a href="GameEngine.html#event:client__slowFrameRate">client__slowFrameRate</a></li><li><a href="GameEngine.html#event:client__stepReset">client__stepReset</a></li><li><a href="GameEngine.html#event:client__syncReceived">client__syncReceived</a></li><li><a href="GameEngine.html#event:objectAdded">objectAdded</a></li><li><a href="GameEngine.html#event:objectDestroyed">objectDestroyed</a></li><li><a href="GameEngine.html#event:playerDisconnected">playerDisconnected</a></li><li><a href="GameEngine.html#event:playerJoined">playerJoined</a></li><li><a href="GameEngine.html#event:postStep">postStep</a></li><li><a href="GameEngine.html#event:preStep">preStep</a></li><li><a href="GameEngine.html#event:processInput">processInput</a></li><li><a href="GameEngine.html#event:server__inputReceived">server__inputReceived</a></li><li><a href="GameEngine.html#event:server__playerDisconnected">server__playerDisconnected</a></li><li><a href="GameEngine.html#event:server__playerJoined">server__playerJoined</a></li><li><a href="GameEngine.html#event:server__postStep">server__postStep</a></li><li><a href="GameEngine.html#event:server__preStep">server__preStep</a></li><li><a href="GameEngine.html#event:server__processInput">server__processInput</a></li><li><a href="GameEngine.html#event:start">start</a></li><li><a href="GameEngine.html#event:syncReceived">syncReceived</a></li></ul>
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<h1 class="page-title">Introduction</h1>
<section>
<header>
</header>
<article>
<p><a href="https://travis-ci.org/lance-gg/lance"><img src="https://travis-ci.org/lance-gg/lance.svg?branch=master" alt="Build Status"></a> <a href="http://inch-ci.org/github/lance-gg/lance"><img src="http://inch-ci.org/github/lance-gg/lance.svg?branch=develop" alt="Inline docs"></a>
<a href="http://slack.lance.gg"><img src="http://slack.lance.gg/badge.svg" alt="Slack"></a></p>
<p><img src="https://cloud.githubusercontent.com/assets/3951311/24590344/0b7748b8-17f4-11e7-84fc-d24c44c7a27a.jpg" style="width: 100%" alt="Lance logo"></p>
<h1><a href="http://lance.gg">Lance</a> is a real-time multiplayer game server</h1><p>Lance provides an extendible Node.JS based server, on which game logic runs, as well as a client-side library
which synchronizes the client's game state with the server game state. In order
to provide a smooth visual experience for each connected client, Lance implements
efficient networking methods, position interpolation and extrapolation, user input
coordination, shadow objects, physics and pseudo-physical movement, automatic
handling of network spikes.</p>
<p>Lance aims to optimize the player's visual experience, while providing
a simple development model which is highly configurable and easy to analyze
and debug.</p>
<h2>See it in action</h2><p>Check out the official demo: <a href="http://spaaace.herokuapp.com">Spaaace</a></p>
<p><img src="https://cloud.githubusercontent.com/assets/3951311/21784604/ffc2d282-d6c4-11e6-97f0-0ada12c4fab7.gif" alt="spaaace"></p>
<h2>Features:</h2><ul>
<li>Focus on writing your game. Lance takes care of the netcode</li>
<li>Can support any type of game or genre </li>
<li>Optimized networking<ul>
<li>TCP via websockets</li>
<li>Communication is packed and serialized into binary</li>
<li>Automatic handling of network spikes with step correction</li>
</ul>
</li>
<li>Intelligent synchronization strategies for lag handling<ul>
<li>Extrapolation (client side prediction) with step re-enactment, or:</li>
<li>Interpolation for optimal object motion</li>
</ul>
</li>
<li>Tools for debugging and tracing</li>
</ul>
<h2>That's so neat! Where do I start?</h2><p>To get a bird's eye view on what's Lance all about and how to use it to make a multiplayer game, we recommend reading the guide: <a href="tutorial-overview_architecture.html">Architecture of a Multiplayer Game</a></p>
<p>If you're more of the learning-by-doing type, you can start with the first tutorial, <a href="tutorial-MyFirstGame.html">My First Game: Pong</a> which contains step-by-step instructions on how to implement a networked version of this classic game.</p>
<h2>Join the fun!</h2><p>We are working hard to build an active, positive and inclusive <a href="tutorial-introduction_community.html">Community</a></p>
<h2>Need help?</h2><p>If you're not exactly sure how to do something, <a href="http://stackoverflow.com/questions/tagged/lance">Stack Overflow</a> is your friend.</p>
<p>If you've encountered a bug and it's not already in the <a href="https://github.com/lance-gg/lance/issues">issues page</a>, open a new issue.</p>
<h2>Built something cool with Lance?</h2><p>Please <a href="http://www.twitter.com/opherv">Let us know</a>! We'd love to play it, and feature it on the <a href="http://lance.gg">Lance homepage</a>.</p>
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