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<h1 class="page">MotionPath</h1>
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>A MotionPath describes the motion of a spatial between waypoints. The path can be linear or rounded. You use MotionPaths to remote-control a spatial, or the camera.</p>
</div>
<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<i class="fa icon-tip" title="Tip"></i>
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<td class="content">
<div class="paragraph">
<p>If you want to remote-control a whole cutscene with several spatials moving at various times, then we recommened you use MotionPaths together with <a href="cinematics.html" class="page">Cinematics</a>.</p>
</div>
</td>
</tr>
</table>
</div>
</div>
</div>
<div class="sect1">
<h2 id="sample-code"><a class="anchor" href="#sample-code"></a>Sample Code</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p><a href="https://github.com/jMonkeyEngine/jmonkeyengine/blob/master/jme3-examples/src/main/java/jme3test/animation/TestMotionPath.java">TestMotionPath.java</a></p>
</li>
<li>
<p><a href="https://github.com/jMonkeyEngine/jmonkeyengine/blob/master/jme3-examples/src/main/java/jme3test/animation/TestCameraMotionPath.java">TestCameraMotionPath.java</a></p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="what-are-way-points"><a class="anchor" href="#what-are-way-points"></a>What Are Way Points?</h2>
<div class="sectionbody">
<div class="paragraph">
<p>When shooting a movie scene, the director tells actors where to walk, for example, by drawing a series of small crosses on the floor. Cameramen often mount the camera on rails (so called dolly track) so they can follow along complex scenes more easily.</p>
</div>
<div class="paragraph">
<p>In JME3, you use MotionPaths to specify a series of positions for a character or the camera. The MotionPath automatically updates the transformation of the spatial in each frame to make it move from one point to the next.</p>
</div>
<div class="ulist">
<ul>
<li>
<p><strong>A way point</strong> is one positions on a path.</p>
</li>
<li>
<p><strong>A MotionPath</strong> contains a list of all way points of one path.</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>The final shape of the path is computed using a linear interpolation or a <a href="http://www.mvps.org/directx/articles/catmull/">Catmull-Rom</a> spline interpolation on the way points.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="create-a-motionpath"><a class="anchor" href="#create-a-motionpath"></a>Create a MotionPath</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Create a Motionpath object and add way points to it.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">MotionPath path = new MotionPath();
path.addWayPoint(new Vector3f(10, 3, 0));
path.addWayPoint(new Vector3f(8, -2, 1));
...</code></pre>
</div>
</div>
<div class="paragraph">
<p>You can configure the path as follows.</p>
</div>
<table class="tableblock frame-all grid-all stretch">
<colgroup>
<col style="width: 50%;">
<col style="width: 50%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">MotionPath Method</th>
<th class="tableblock halign-left valign-top">Usage</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>path.setCycle(true)</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Sets whether the motion along this path should be closed (true) or open-ended (false).</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>path.addWayPoint(vector)</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Adds individual waypoints to this path. The order is relevant.</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>path.removeWayPoint(vector)<br>
removeWayPoint(index)</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Removes a way point from this path. You can specify the point that you want to remove as vector or as integer index.</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>path.setCurveTension(0.83f)</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Sets the tension of the curve (Catmull-Rom Spline). A value of 0.0f results in a straight linear line, 1.0 a very round curve.</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>path.getNbWayPoints()</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Returns the number of waypoints in this path.</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>path.enableDebugShape(assetManager,rootNode)</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Shows a line that visualizes the path. Use this during development and for debugging so you see what you are doing.</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>path.disableDebugShape()</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Hides the line that visualizes the path. Use this for the release build.</p>
</div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect1">
<h2 id="motionpathlistener"><a class="anchor" href="#motionpathlistener"></a>MotionPathListener</h2>
<div class="sectionbody">
<div class="paragraph">
<p>You can hook interactions into a playing MotionPath. Register a MotionPathListener to the MotionPath to track whether way points have been reached, and then trigger a custom action. The onWayPointReach() method of the interface gives you access to the MotionEvent object <code>control</code>, and an integer value representing the current wayPointIndex.</p>
</div>
<div class="paragraph">
<p>In this example, you just print the status at every way point. In a game you could trigger actions here: Transformations, animations, sounds, game actions (attack, open door, etc).</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">path.addListener( new MotionPathListener() {
  public void onWayPointReach(MotionEvent control, int wayPointIndex) {
    if (path.getNbWayPoints() == wayPointIndex + 1) {
      println(control.getSpatial().getName() + " has finished moving. ");
    } else {
      println(control.getSpatial().getName() + " has reached way point " + wayPointIndex);
    }
  }
});</code></pre>
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