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    <li>Controlling Game Logic</li>
    <li><a href="update_loop.html">Update Loop</a></li>
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<h1 class="page">Main Update Loop</h1>
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>Extending your application from <a href="simpleapplication.html" class="xref page">com.jme3.app.SimpleApplication</a> provides you with an update loop. This is where you implement your game logic (game mechanics).</p>
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<div class="paragraph">
<p>Some usage examples: Here you remote-control NPCs (computer controlled characters), generate game events, and respond to user input.</p>
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<p>To let you see the main update loop in context, understand that the SimpleApplication does the following:</p>
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<div class="ulist">
<ul>
<li>
<p><strong>Initialization</strong> – Execute <code>simpleInitApp()</code> method once.</p>
</li>
<li>
<p><strong>Main Update Loop</strong></p>
<div class="olist loweralpha">
<ol class="loweralpha" type="a">
<li>
<p>Input listeners respond to mouse clicks and keyboard presses – <a href="../input/input_handling.html" class="xref page">Input handling</a></p>
</li>
<li>
<p>Update game state:</p>
<div class="olist lowerroman">
<ol class="lowerroman" type="i">
<li>
<p>Update overall game state – Execute <a href="state/application_states.html" class="xref page">Application States</a></p>
</li>
<li>
<p>User code update – Execute <code>simpleUpdate()</code> method</p>
</li>
<li>
<p>Logical update of entities – Execute <a href="../scene/control/custom_controls.html" class="xref page">Custom Controls</a></p>
</li>
</ol>
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<li>
<p>Render audio and video</p>
<div class="olist lowerroman">
<ol class="lowerroman" type="i">
<li>
<p><a href="state/application_states.html" class="xref page">Application States</a> rendering.</p>
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<li>
<p>Scene rendering.</p>
</li>
<li>
<p>User code rendering – Execute <code>simpleRender()</code> method.</p>
</li>
</ol>
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</li>
<li>
<p>Repeat loop.</p>
</li>
</ol>
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</li>
<li>
<p><strong>Quit</strong> – If user requests <code>exit()</code>, execute <code>cleanup()</code> and <code>destroy()</code>.<br>
The jME window closes and the loop ends.</p>
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<div class="sect1">
<h2 id="usage"><a class="anchor" href="#usage"></a>Usage</h2>
<div class="sectionbody">
<div class="paragraph">
<p>In a trivial <a href="simpleapplication.html" class="xref page">SimpleApplication</a> (such as a <a href="../../tutorials/beginner/beginner.html" class="xref page">Hello World tutorial</a>), all code is either in the <code>simpleInitApp()</code> (initialization) or <code>simpleUpdate()</code> (behaviour) method – or in a helper method/class that is called from one of these two. This trivial approach will make your main class very long, hard to read, and hard to maintain. You don&#8217;t need to load the whole scene at once, and you don&#8217;t need to run all conditionals tests all the time.</p>
</div>
<div class="paragraph">
<p>It&#8217;s a best practice to modularize your game mechanics and spread out initialization and update loop code over several Java objects:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Move modular code blocks from the <code>simpleInitApp()</code> method into <a href="state/application_states.html" class="xref page">AppStates</a>. Attach AppStates to initialize custom subsets of &#8220;one&#8221; dungeon, and detach it when the player exits this &#8220;dungeon&#8221;.<br>
Examples: Weather/sky audio and visuals, physics collision shapes, sub-rootnodes of individual dungeons including dungeon NPCs, etc.</p>
</li>
<li>
<p>Move modular code blocks from the <code>simpleUpdate()</code> method into the update loops of <a href="../scene/control/custom_controls.html" class="xref page">Custom Controls</a> to control individual entity behavior (NPCs), and into the update method of <a href="state/application_states.html" class="xref page">AppStates</a> to control world events.<br>
Examples: Weather behaviour, light behaviour, physics behaviour, individual NPC behaviour, trap behaviour, etc.</p>
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