@aidinabedi/playcanvas
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PlayCanvas WebGL game engine
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<div class='sidebarToggle'><span></span>Class List</div>
<main class="cls">
<h1>pc.Picker</h1>
<p><p>Picker object used to select mesh instances from screen coordinates.</p></p>
<!-- summary -->
<h1>Summary</h1>
<!--type definitions-->
<!--static properties-->
<!--static methods-->
<!--properties-->
<h3>Properties</h3>
<table class="properties">
<tr>
<td><a href="#height">height</a></td><td><p>Height of the pick buffer in pixels (read-only).</td>
</tr>
<tr>
<td><a href="#renderTarget">renderTarget</a></td><td><p>The render target used by the picker internally (read-only).</td>
</tr>
<tr>
<td><a href="#width">width</a></td><td><p>Width of the pick buffer in pixels (read-only).</td>
</tr>
</table>
<!--methods-->
<h3>Methods</h3>
<table class="properties">
<tr>
<td><a href="#getSelection">getSelection</a></td><td><p>Return the list of mesh instances selected by the specified rectangle in the
previously prepared pick buffer.</td>
</tr>
<tr>
<td><a href="#prepare">prepare</a></td><td><p>Primes the pick buffer with a rendering of the specified models from the point of view
of the supplied camera.</td>
</tr>
<tr>
<td><a href="#resize">resize</a></td><td><p>Sets the resolution of the pick buffer.</td>
</tr>
</table>
<!--events-->
<h1>Details</h1>
<!--type definitions-->
<!--static members-->
<!--static methods-->
<h2>Constructor</h2>
<!-- Constructor -->
<div id="Picker">
<h3 class="methodname">Picker(app, width, height) <a class="font-icon" href="#Picker"></a></h3>
<p><p>Create a new instance of a Picker object.</p></p>
<h4>Parameters</h4>
<table>
<tr>
<td>app</td><td><a href="pc.Application.html">pc.Application</a></td><td><p>The application managing this picker instance.</p></td>
</tr>
<tr>
<td>width</td><td><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number">number</a></td><td><p>The width of the pick buffer in pixels.</p></td>
</tr>
<tr>
<td>height</td><td><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number">number</a></td><td><p>The height of the pick buffer in pixels.</p></td>
</tr>
</table>
</div>
<!--properties-->
<h2>Properties</h2>
<div id="height">
<span class="property"><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number">number</a></span><span class="property">height <a class="font-icon" href="#height"></a></span>
<p><p>Height of the pick buffer in pixels (read-only).</p></p>
</div>
<div id="renderTarget">
<span class="property"><a href="pc.RenderTarget.html">pc.RenderTarget</a></span><span class="property">renderTarget <a class="font-icon" href="#renderTarget"></a></span>
<p><p>The render target used by the picker internally (read-only).</p></p>
</div>
<div id="width">
<span class="property"><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number">number</a></span><span class="property">width <a class="font-icon" href="#width"></a></span>
<p><p>Width of the pick buffer in pixels (read-only).</p></p>
</div>
<!--methods-->
<h2>Methods</h2>
<div id="getSelection">
<h3 class="methodname">getSelection(x, y, [width], [height]) <a class="font-icon" href="#getSelection"></a></h3>
<p><p>Return the list of mesh instances selected by the specified rectangle in the
previously prepared pick buffer.The rectangle using top-left coordinate system.</p></p>
<pre><code class="javascript">// Get the selection at the point (10,20)
var selection = picker.getSelection(10, 20);</code></pre>
<pre><code class="javascript">// Get all models in rectangle with corners at (10,20) and (20,40)
var selection = picker.getSelection(10, 20, 10, 20);</code></pre>
<h4>Parameters</h4>
<table>
<tr>
<td>x</td><td><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number">number</a></td><td><p>The left edge of the rectangle.</p></td>
</tr>
<tr>
<td>y</td><td><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number">number</a></td><td><p>The top edge of the rectangle.</p></td>
</tr>
<tr>
<td>width</td><td><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number">number</a></td><td><p>The width of the rectangle.</p></td>
</tr>
<tr>
<td>height</td><td><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number">number</a></td><td><p>The height of the rectangle.</p></td>
</tr>
</table>
<h4>Returns</h4>
<a href="pc.MeshInstance.html">pc.MeshInstance[]</a> <p>An array of mesh instances that are in the selection.</p>
</div>
<div id="prepare">
<h3 class="methodname">prepare(camera, scene, [arg]) <a class="font-icon" href="#prepare"></a></h3>
<p><p>Primes the pick buffer with a rendering of the specified models from the point of view
of the supplied camera. Once the pick buffer has been prepared, pc.Picker#getSelection can be
called multiple times on the same picker object. Therefore, if the models or camera do not change
in any way, pc.Picker#prepare does not need to be called again.</p></p>
<h4>Parameters</h4>
<table>
<tr>
<td>camera</td><td><a href="pc.CameraComponent.html">pc.CameraComponent</a></td><td><p>The camera component used to render the scene.</p></td>
</tr>
<tr>
<td>scene</td><td><a href="pc.Scene.html">pc.Scene</a></td><td><p>The scene containing the pickable mesh instances.</p></td>
</tr>
<tr>
<td>arg</td><td><a href="pc.Layer.html">pc.Layer</a>, <a href="pc.RenderTarget.html">pc.RenderTarget</a></td><td><p>Layer or RenderTarget from which objects will be picked. If not supplied, all layers rendering to backbuffer before this layer will be used.</p></td>
</tr>
</table>
</div>
<div id="resize">
<h3 class="methodname">resize(width, height) <a class="font-icon" href="#resize"></a></h3>
<p><p>Sets the resolution of the pick buffer. The pick buffer resolution does not need
to match the resolution of the corresponding frame buffer use for general rendering of the
3D scene. However, the lower the resolution of the pick buffer, the less accurate the selection
results returned by pc.Picker#getSelection. On the other hand, smaller pick buffers will
yield greater performance, so there is a trade off.</p></p>
<h4>Parameters</h4>
<table>
<tr>
<td>width</td><td><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number">number</a></td><td><p>The width of the pick buffer in pixels.</p></td>
</tr>
<tr>
<td>height</td><td><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number">number</a></td><td><p>The height of the pick buffer in pixels.</p></td>
</tr>
</table>
</div>
<!--events-->
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