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<td >Qt 5.12</td><td ><a href="qt3d-index.html">Qt 3D</a></td><td ><a href="qt3d-qml.html">QML Types</a></td><td >SpotLight QML Type</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right"><a href="qt3d-index.html">Qt 5.12.6 Reference Documentation</a></td>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#properties">Properties</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
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<h1 class="title">SpotLight QML Type</h1>
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<p>Encapsulate a Spot Light object in a Qt 3D scene. <a href="#details">More...</a></p>
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<tr><td class="memItemLeft rightAlign topAlign"> Import Statement:</td><td class="memItemRight bottomAlign"> import Qt3D.Render 2.12</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Since:</td><td class="memItemRight bottomAlign"> Qt 5.5</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Instantiates:</td><td class="memItemRight bottomAlign"> <a href="qml-qt3d-render-spotlight.html"><a href="qt3drender-qspotlight.html">QSpotLight</a></td></tr></table></div><ul>
<li><a href="qml-qt3d-render-spotlight-members.html">List of all members, including inherited members</a></li>
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<h2 id="properties">Properties</h2>
<ul>
<li class="fn"><b><b><a href="qml-qt3d-render-spotlight.html#constantAttenuation-prop">constantAttenuation</a></b></b> : float</li>
<li class="fn"><b><b><a href="qml-qt3d-render-spotlight.html#cutOffAngle-prop">cutOffAngle</a></b></b> : float</li>
<li class="fn"><b><b><a href="qml-qt3d-render-spotlight.html#linearAttenuation-prop">linearAttenuation</a></b></b> : float</li>
<li class="fn"><b><b><a href="qml-qt3d-render-spotlight.html#localDirection-prop">localDirection</a></b></b> : vector3d</li>
<li class="fn"><b><b><a href="qml-qt3d-render-spotlight.html#quadraticAttenuation-prop">quadraticAttenuation</a></b></b> : float</li>
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<!-- $$$SpotLight-description -->
<a name="details"></a>
<h2 id="details">Detailed Description</h2>
<p>A spotlight is a light source that emits a cone of light in a particular direction.</p>
<p>A spotlight uses three attenuation factors to describe how the intensity of the light decreases over distance. These factors are designed to be used together in calcuating total attenuation. For the materials in Qt3D Extras the following formula is used, where distance is the distance from the light to the surface being rendered:</p>
<pre class="cpp">
totalAttenuation <span class="operator">=</span> <span class="number">1.0</span> <span class="operator">/</span> (constantAttenuation <span class="operator">+</span> (linearAttenuation <span class="operator">*</span> distance) <span class="operator">+</span> (quadraticAttenuation <span class="operator">*</span> distance <span class="operator">*</span> distance));
</pre>
<p>Custom materials may choose to interpret these factors differently.</p>
<!-- @@@SpotLight -->
<h2>Property Documentation</h2>
<!-- $$$constantAttenuation -->
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<tr valign="top" class="odd" id="constantAttenuation-prop">
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<a name="constantAttenuation-prop"></a><span class="name">constantAttenuation</span> : <span class="type">float</span></p></td></tr>
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</div><div class="qmldoc"><p>Specifies the constant attenuation of the spot light</p>
</div></div><!-- @@@constantAttenuation -->
<br/>
<!-- $$$cutOffAngle -->
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<a name="cutOffAngle-prop"></a><span class="name">cutOffAngle</span> : <span class="type">float</span></p></td></tr>
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</div><div class="qmldoc"><p>Specifies the cut off angle of the spot light</p>
</div></div><!-- @@@cutOffAngle -->
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<!-- $$$linearAttenuation -->
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<tr valign="top" class="odd" id="linearAttenuation-prop">
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<a name="linearAttenuation-prop"></a><span class="name">linearAttenuation</span> : <span class="type">float</span></p></td></tr>
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</div><div class="qmldoc"><p>Specifies the linear attenuation of the spot light</p>
</div></div><!-- @@@linearAttenuation -->
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<!-- $$$localDirection -->
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<tr valign="top" class="odd" id="localDirection-prop">
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<a name="localDirection-prop"></a><span class="name">localDirection</span> : <span class="type">vector3d</span></p></td></tr>
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</div><div class="qmldoc"><p>Specifies the local direction of the spot light</p>
</div></div><!-- @@@localDirection -->
<br/>
<!-- $$$quadraticAttenuation -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="quadraticAttenuation-prop">
<td class="tblQmlPropNode"><p>
<a name="quadraticAttenuation-prop"></a><span class="name">quadraticAttenuation</span> : <span class="type">float</span></p></td></tr>
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</div><div class="qmldoc"><p>Specifies the quadratic attenuation of the spot light</p>
</div></div><!-- @@@quadraticAttenuation -->
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