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<article class="doc">
<h1 class="page">The jME3 Camera</h1>
<div id="preamble">
<div class="sectionbody">
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<i class="fa icon-note" title="Note"></i>
</td>
<td class="content">
<div class="paragraph">
<p>By default, the mouse pointer is invisible, and the mouse is set up to control the camera rotation.</p>
</div>
</td>
</tr>
</table>
</div>
</div>
</div>
<div class="sect1">
<h2 id="default-camera"><a class="anchor" href="#default-camera"></a>Default Camera</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The default com.jme3.renderer.Camera object is <code>cam</code> in com.jme3.app.Application.</p>
</div>
<div class="paragraph">
<p>The camera object is created with the following defaults:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Width and height are set to the current Application&#8217;s settings.getWidth() and settings.getHeight() values.</p>
</li>
<li>
<p>Frustum Perspective:</p>
<div class="ulist">
<ul>
<li>
<p>Frame of view angle of 45° along the Y axis</p>
</li>
<li>
<p>Aspect ratio of width divided by height</p>
</li>
<li>
<p>Near view plane of 1 wu</p>
</li>
<li>
<p>Far view plane of 1000 wu</p>
</li>
</ul>
</div>
</li>
<li>
<p>Start location at (0f, 0f, 10f).</p>
</li>
<li>
<p>Start direction is looking at the origin.</p>
</li>
</ul>
</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">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>cam.getLocation(), setLocation()</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>The camera position</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>cam.getRotation(), setRotation()</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>The camera rotation</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>cam.getLeft(), setLeft()</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>The left axis of the camera</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>cam.getUp(), setUp()</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>The up axis of the camera, usually Vector3f(0,1,0)</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>cam.getDirection()</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>The vector the camera is facing</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>cam.getAxes(), setAxes(left,up,dir)</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>One accessor for the three properties left/up/direction.</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>cam.getFrame(), setFrame(loc,left,up,dir)</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>One accessor for the four properties location/left/up/direction.</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>cam.resize(width, height, fixAspect)</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Resize an existing camera object while keeping all other settings. Set fixAspect to true to adjust the aspect ratio (?)</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>cam.setFrustum( near, far, left, right, top, bottom )</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>The frustum is defined by the near/far plane, left/right plane, top/bottom plane (all distances as float values)</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>cam.setFrustumPerspective( fovY, aspect ratio, near, far)</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>The frustum is defined by view angle along the Y axis (in degrees), aspect ratio, and the near/far plane.</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>cam.lookAt(target,up)</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Turn the camera to look at Coordinate target, and rotate it around the up axis.</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>cam.setParallelProjection(false)</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Normal perspective</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>cam.setParallelProjection(true)</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Parallel projection perspective</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>cam.getScreenCoordinates(worldPos)</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Converts the given position from world space to screen space.</p>
</div></div></td>
</tr>
</tbody>
</table>
<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<i class="fa icon-tip" title="Tip"></i>
</td>
<td class="content">
<div class="paragraph">
<p>After you change view port, frustum, or frame, call <code>cam.update();</code></p>
</div>
</td>
</tr>
</table>
</div>
</div>
</div>
<div class="sect1">
<h2 id="flyby-camera"><a class="anchor" href="#flyby-camera"></a>FlyBy Camera</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The <code>flyCam</code> class field gives you access to an AppState that extends the default camera in <code>com.jme3.app.SimpleApplication</code> with more features. The input manager of the <code>com.jme3.input.FlyByCamera</code> AppState is preconfigured to respond to the WASD keys for walking forwards and backwards, and strafing to the sides; move the mouse to rotate the camera (&#8220;Mouse Look&#8221;), scroll the mouse wheel for zooming in or out. The QZ keys raise or lower the camera vertically.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-none hljs">Q  W             up   forw
A  S  D    --&gt;  left  back  right
Z               down</code></pre>
</div>
</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">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>flyCam.setEnabled(true);</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Activate the flyby cam</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>flyCam.setMoveSpeed(10);</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Control the move speed</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>flyCam.setRotationSpeed(10);</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Control the rotation speed</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>flyCam.setDragToRotate(true)</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Forces the player to keep mouse button pressed to rotate camera, typically used for Applets. If false (default), all mouse movement will be captured and interpreted as rotations.</p>
</div></div></td>
</tr>
</tbody>
</table>
<div class="paragraph">
<p>The FlyByCamera is active by default, but you can change all these defaults for your game.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="chase-camera"><a class="anchor" href="#chase-camera"></a>Chase Camera</h2>
<div class="sectionbody">
<div class="paragraph">
<p>jME3 also supports an optional Chase Cam that can follow a moving target Spatial (<code>com.jme3.input.ChaseCamera</code>). When you use the chase cam, the player clicks and hold the mouse button to rotate the camera around the camera target. You can use a chase cam if you need the mouse pointer visible in your game.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">flyCam.setEnabled(false);
ChaseCamera chaseCam = new ChaseCamera(cam, target, inputManager);</code></pre>
</div>
</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">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>chaseCam.setSmoothMotion(true);</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Interpolates a smoother acceleration/deceleration when the camera moves.</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>chaseCam.setChasingSensitivity(5f)</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>The lower the chasing sensitivity, the slower the camera will follow the target when it moves.</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>chaseCam.setTrailingSensitivity(0.5f)</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>The lower the trailing sensitivity, the slower the camera will begin to go after the target when it moves. Default is 0.5;</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>chaseCam.setRotationSensitivity(5f)</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>The lower the sensitivity, the slower the camera will rotate around the target when the mouse is dragged. Default is 5.</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>chaseCam.setTrailingRotationInertia(0.1f)</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>This prevents the camera to stop too abruptly when the target stops rotating before the camera has reached the target&#8217;s trailing position. Default is 0.1f.</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>chaseCam.setDefaultDistance(40);</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>The default distance to the target at the start of the application.</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>chaseCam.setMaxDistance(40);</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>The maximum zoom distance. Default is 40f.</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>chaseCam.setMinDistance(1);</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>The minimum zoom distance. Default is 1f.</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>chaseCam.setMinVerticalRotation(-FastMath.PI/2);</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>The minimal vertical rotation angle of the camera around the target. Default is 0.</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>chaseCam.setDefaultVerticalRotation(-FastMath.PI/2);</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>The default vertical rotation angle of the camera around the target at the start of the application.</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>chaseCam.setDefaultHorizontalRotation(-FastMath.PI/2);</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>The default horizontal rotation angle of the camera around the target at the start of the application.</p>
</div></div></td>
</tr>
</tbody>
</table>
<div class="paragraph">
<p>To disable rotation and zooming of chase camera by mouse you can use following methods.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">//to disable rotation
inputManager.deleteMapping(CameraInput.CHASECAM_TOGGLEROTATE);
//to disable zoom out
inputManager.deleteMapping(CameraInput.CHASECAM_ZOOMOUT);
//to disable zoom in
inputManager.deleteMapping(CameraInput.CHASECAM_ZOOMIN);</code></pre>
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