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module-twgl_primitives.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>twgl/primitives - Documentation</title>
<script src="scripts/prettify/prettify.js"></script>
<script src="scripts/prettify/lang-css.js"></script>
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<li class="nav-link nav-home-link"><a href="index.html">Home</a></li><li class="nav-heading">Modules</li><li class="nav-heading"><span class="nav-item-type type-module">M</span><span class="nav-item-name"><a href="module-twgl.html">twgl</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="module-twgl.html#.addExtensionsToContext">addExtensionsToContext</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="module-twgl.html#.bindFramebufferInfo">bindFramebufferInfo</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="module-twgl.html#.bindTransformFeedbackInfo">bindTransformFeedbackInfo</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="module-twgl.html#.bindUniformBlock">bindUniformBlock</a></span></li><li 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type-function">F</span><span class="nav-item-name"><a href="module-twgl_m4.html#.scale">scale</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="module-twgl_m4.html#.scaling">scaling</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="module-twgl_m4.html#.setAxis">setAxis</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="module-twgl_m4.html#.setTranslation">setTranslation</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="module-twgl_m4.html#.transformDirection">transformDirection</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="module-twgl_m4.html#.transformNormal">transformNormal</a></span></li><li class="nav-item"><span 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<div id="main">
<h1 class="page-title">twgl/primitives</h1>
<section>
<header>
</header>
<article>
<div class="container-overview">
<div class="description"><p>Various functions to make simple primitives</p>
<p>note: Most primitive functions come in 3 styles</p>
<ul>
<li><p><code>createSomeShapeBufferInfo</code></p>
<p>These functions are almost always the functions you want to call. They<br>create vertices then make WebGLBuffers and create <a href="module-twgl.html#.AttribInfo"><code>module:twgl.AttribInfo</code></a>s<br>returing a <a href="module-twgl.html#.BufferInfo"><code>module:twgl.BufferInfo</code></a> you can pass to <a href="module-twgl.html#.setBuffersAndAttributes"><code>module:twgl.setBuffersAndAttributes</code></a><br>and <a href="module-twgl.html#.drawBufferInfo"><code>module:twgl.drawBufferInfo</code></a> etc...</p>
</li>
<li><p><code>createSomeShapeBuffers</code></p>
<p>These create WebGLBuffers and put your data in them but nothing else.<br>It's a shortcut to doing it yourself if you don't want to use<br>the higher level functions.</p>
</li>
<li><p><code>createSomeShapeVertices</code></p>
<p>These just create vertices, no buffers. This allows you to manipulate the vertices<br>or add more data before generating a <a href="module-twgl.html#.BufferInfo"><code>module:twgl.BufferInfo</code></a>. Once you're finished<br>manipulating the vertices call <a href="module-twgl.html#.createBufferInfoFromArrays"><code>module:twgl.createBufferInfoFromArrays</code></a>.</p>
<p>example:</p>
<pre class="prettyprint source"><code>const arrays = twgl.primitives.createPlaneArrays(1);
twgl.primitives.reorientVertices(arrays, m4.rotationX(Math.PI * 0.5));
const bufferInfo = twgl.createBufferInfoFromArrays(gl, arrays);</code></pre></li>
</ul></div>
<div class="section-method">
<dl class="details">
</dl>
</div>
</div>
<h3 class="subsection-title">Members</h3>
<div class="section-members">
<h4 class="name" id="~CUBE_FACE_INDICES"><span class="type-signature">(inner, constant) </span>CUBE_FACE_INDICES<span class="type-signature"> :Array.<Array.<number>></span></h4>
<div class="description">
<p>Array of the indices of corners of each face of a cube.</p>
</div>
<dl class="details">
</dl>
<h5>Type:</h5>
<ul>
<li>
<span class="param-type"><code>Array.<Array.<number>></code></span>
</li>
</ul>
</div>
<h3 class="subsection-title">Methods</h3>
<div class="section-method">
<h4 class="name" id=".concatVertices"><span class="type-signature">(static) </span>concatVertices<span class="signature">(arrays)</span><span class="type-signature"> → {<a href="module-twgl.html#.Arrays">module:twgl.Arrays</a>}</span></h4>
<div class="description">
<p>Concatinates sets of vertices</p>
<p>Assumes the vertices match in composition. For example<br>if one set of vertices has positions, normals, and indices<br>all sets of vertices must have positions, normals, and indices<br>and of the same type.</p>
<p>Example:</p>
<pre class="prettyprint source"><code> const cubeVertices = twgl.primtiives.createCubeVertices(2);
const sphereVertices = twgl.primitives.createSphereVertices(1, 10, 10);
// move the sphere 2 units up
twgl.primitives.reorientVertices(
sphereVertices, twgl.m4.translation([0, 2, 0]));
// merge the sphere with the cube
const cubeSphereVertices = twgl.primitives.concatVertices(
[cubeVertices, sphereVertices]);
// turn them into WebGL buffers and attrib data
const bufferInfo = twgl.createBufferInfoFromArrays(gl, cubeSphereVertices);</code></pre>
</div>
<dl class="details">
</dl>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>arrays</code></td>
<td class="type">
<span class="param-type"><code>Array.<<a href="module-twgl.html#.Arrays">module:twgl.Arrays</a>></code></span>
</td>
<td class="description last">
<p>Array of arrays of vertices</p>
</td>
</tr>
</tbody>
</table>
<div class="section-returns">
<h5>Returns:</h5>
<dl class="param-type">
<dt>
Type:
</dt>
<dd>
<span class="param-type"><code><a href="module-twgl.html#.Arrays">module:twgl.Arrays</a></code></span>
</dd>
</dl>
<div class="param-desc">
<p>The concatinated vertices.</p>
</div>
</div>
</div>
<div class="section-method">
<h4 class="name" id=".create3DFBufferInfo"><span class="type-signature">(static) </span>create3DFBufferInfo<span class="signature">(gl)</span><span class="type-signature"> → {<a href="module-twgl.html#.BufferInfo">module:twgl.BufferInfo</a>}</span></h4>
<div class="description">
<p>Creates 3D 'F' BufferInfo.<br>An 'F' is useful because you can easily tell which way it is oriented.<br>The created 'F' has position, normal, texcoord, and color buffers.</p>
</div>
<dl class="details">
</dl>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>gl</code></td>
<td class="type">
<span class="param-type"><code>WebGLRenderingContext</code></span>
</td>
<td class="description last">
<p>The WebGLRenderingContext.</p>
</td>
</tr>
</tbody>
</table>
<div class="section-returns">
<h5>Returns:</h5>
<dl class="param-type">
<dt>
Type:
</dt>
<dd>
<span class="param-type"><code><a href="module-twgl.html#.BufferInfo">module:twgl.BufferInfo</a></code></span>
</dd>
</dl>
<div class="param-desc">
<p>The created BufferInfo.</p>
</div>
</div>
</div>
<div class="section-method">
<h4 class="name" id=".create3DFBuffers"><span class="type-signature">(static) </span>create3DFBuffers<span class="signature">(gl)</span><span class="type-signature"> → {Object.<string, WebGLBuffer>}</span></h4>
<div class="description">
<p>Creates 3D 'F' buffers.<br>An 'F' is useful because you can easily tell which way it is oriented.<br>The created 'F' has position, normal, texcoord, and color buffers.</p>
</div>
<dl class="details">
</dl>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>gl</code></td>
<td class="type">
<span class="param-type"><code>WebGLRenderingContext</code></span>
</td>
<td class="description last">
<p>The WebGLRenderingContext.</p>
</td>
</tr>
</tbody>
</table>
<div class="section-returns">
<h5>Returns:</h5>
<dl class="param-type">
<dt>
Type:
</dt>
<dd>
<span class="param-type"><code>Object.<string, WebGLBuffer></code></span>
</dd>
</dl>
<div class="param-desc">
<p>The created buffers.</p>
</div>
</div>
</div>
<div class="section-method">
<h4 class="name" id=".create3DFVertices"><span class="type-signature">(static) </span>create3DFVertices<span class="signature">()</span><span class="type-signature"> → {Object.<string, TypedArray>}</span></h4>
<div class="description">
<p>Creates 3D 'F' vertices.<br>An 'F' is useful because you can easily tell which way it is oriented.<br>The created 'F' has position, normal, texcoord, and color arrays.</p>
</div>
<dl class="details">
</dl>
<div class="section-returns">
<h5>Returns:</h5>
<dl class="param-type">
<dt>
Type:
</dt>
<dd>
<span class="param-type"><code>Object.<string, TypedArray></code></span>
</dd>
</dl>
<div class="param-desc">
<p>The created vertices.</p>
</div>
</div>
</div>
<div class="section-method">
<h4 class="name" id=".createAugmentedTypedArray"><span class="type-signature">(static) </span>createAugmentedTypedArray<span class="signature">(numComponents, numElements, opt_type)</span><span class="type-signature"> → {ArrayBufferView}</span></h4>
<div class="description">
<p>creates a typed array with a <code>push</code> function attached<br>so that you can easily <em>push</em> values.</p>
<p><code>push</code> can take multiple arguments. If an argument is an array each element<br>of the array will be added to the typed array.</p>
<p>Example:</p>
<pre class="prettyprint source"><code>const array = createAugmentedTypedArray(3, 2); // creates a Float32Array with 6 values
array.push(1, 2, 3);
array.push([4, 5, 6]);
// array now contains [1, 2, 3, 4, 5, 6]</code></pre><p>Also has <code>numComponents</code> and <code>numElements</code> properties.</p>
</div>
<dl class="details">
</dl>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>numComponents</code></td>
<td class="type">
<span class="param-type"><code>number</code></span>
</td>
<td class="description last">
<p>number of components</p>
</td>
</tr>
<tr>
<td class="name"><code>numElements</code></td>
<td class="type">
<span class="param-type"><code>number</code></span>
</td>
<td class="description last">
<p>number of elements. The total size of the array will be <code>numComponents * numElements</code>.</p>
</td>
</tr>
<tr>
<td class="name"><code>opt_type</code></td>
<td class="type">
<span class="param-type"><code>constructor</code></span>
</td>
<td class="description last">
<p>A constructor for the type. Default = <code>Float32Array</code>.</p>
</td>
</tr>
</tbody>
</table>
<div class="section-returns">
<h5>Returns:</h5>