qd-changjing/public/static/Build/Documentation/GeometryAttribute.html

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<title>GeometryAttribute - Cesium Documentation</title>
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GeometryAttribute
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<article>
<div class="container-overview">
<div class="nameContainer">
<h4 class="name" id="GeometryAttribute">
<a href="#GeometryAttribute" class="doc-link"></a>
new Cesium.GeometryAttribute<span class="signature">(<span class="optional">options</span>)</span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Core/GeometryAttribute.js#L40">Core/GeometryAttribute.js 40</a>
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</h4>
</div>
<div class="description">
Values and type information for geometry attributes. A <a href="Geometry.html"><code>Geometry</code></a>
generally contains one or more attributes. All attributes together form
the geometry's vertices.
</div>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>options</code></td>
<td class="type">
<span class="param-type">Object</span>
</td>
<td class="description last">
<span class="optional">optional</span>
Object with the following properties:
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Default</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>componentDatatype</code></td>
<td class="type">
<span class="param-type"><a href="global.html#ComponentDatatype">ComponentDatatype</a></span>
</td>
<td class="default">
</td>
<td class="description last">
<span class="optional">optional</span>
The datatype of each component in the attribute, e.g., individual elements in values.</td>
</tr>
<tr>
<td class="name"><code>componentsPerAttribute</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="default">
</td>
<td class="description last">
<span class="optional">optional</span>
A number between 1 and 4 that defines the number of components in an attributes.</td>
</tr>
<tr>
<td class="name"><code>normalize</code></td>
<td class="type">
<span class="param-type">Boolean</span>
</td>
<td class="default">
<code class="language-javascript">false</code>
</td>
<td class="description last">
<span class="optional">optional</span>
When <code>true</code> and <code>componentDatatype</code> is an integer format, indicate that the components should be mapped to the range [0, 1] (unsigned) or [-1, 1] (signed) when they are accessed as floating-point for rendering.</td>
</tr>
<tr>
<td class="name"><code>values</code></td>
<td class="type">
<span class="param-type">Array.&lt;number></span>
|
<span class="param-type">Int8Array</span>
|
<span class="param-type">Uint8Array</span>
|
<span class="param-type">Int16Array</span>
|
<span class="param-type">Uint16Array</span>
|
<span class="param-type">Int32Array</span>
|
<span class="param-type">Uint32Array</span>
|
<span class="param-type">Float32Array</span>
|
<span class="param-type">Float64Array</span>
</td>
<td class="default">
</td>
<td class="description last">
<span class="optional">optional</span>
The values for the attributes stored in a typed array.</td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
<h5>Throws:</h5>
<ul>
<li>
<div class="param-desc">
<span class="param-type"><a href="DeveloperError.html">DeveloperError</a></span>
: options.componentsPerAttribute must be between 1 and 4.
</div>
</li>
</ul>
<dl class="details">
<h5>Example:</h5>
<pre><code class="language-javascript">const geometry = new Cesium.Geometry({
attributes : {
position : new Cesium.GeometryAttribute({
componentDatatype : Cesium.ComponentDatatype.FLOAT,
componentsPerAttribute : 3,
values : new Float32Array([
0.0, 0.0, 0.0,
7500000.0, 0.0, 0.0,
0.0, 7500000.0, 0.0
])
})
},
primitiveType : Cesium.PrimitiveType.LINE_LOOP
});</code></pre>
<h5>See:</h5>
<ul class="see-list">
<li><a href="Geometry.html">Geometry</a></li>
</ul>
</dl>
</div>
<h3 class="subsection-title">Members</h3>
<div class="nameContainer">
<h4 class="name" id="componentDatatype">
<a href="#componentDatatype" class="doc-link"></a>
componentDatatype<span class="type-signature"> : <a href="global.html#ComponentDatatype">ComponentDatatype</a></span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Core/GeometryAttribute.js#L71">Core/GeometryAttribute.js 71</a>
</div>
</h4>
</div>
<div class="description">
The datatype of each component in the attribute, e.g., individual elements in
<a href="GeometryAttribute.html#values"><code>GeometryAttribute#values</code></a>.
</div>
<dl class="details">
<span class="details-header">Default Value:</span>
<code class="language-javascript">undefined</code>
</dl>
<div class="nameContainer">
<h4 class="name" id="componentsPerAttribute">
<a href="#componentsPerAttribute" class="doc-link"></a>
componentsPerAttribute<span class="type-signature"> : Number</span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Core/GeometryAttribute.js#L91">Core/GeometryAttribute.js 91</a>
</div>
</h4>
</div>
<div class="description">
A number between 1 and 4 that defines the number of components in an attributes.
For example, a position attribute with x, y, and z components would have 3 as
shown in the code example.
</div>
<dl class="details">
<span class="details-header">Default Value:</span>
<code class="language-javascript">undefined</code>
<h5>Example:</h5>
<pre><code class="language-javascript">attribute.componentDatatype = Cesium.ComponentDatatype.FLOAT;
attribute.componentsPerAttribute = 3;
attribute.values = new Float32Array([
0.0, 0.0, 0.0,
7500000.0, 0.0, 0.0,
0.0, 7500000.0, 0.0
]);</code></pre>
</dl>
<div class="nameContainer">
<h4 class="name" id="normalize">
<a href="#normalize" class="doc-link"></a>
normalize<span class="type-signature"> : Boolean</span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Core/GeometryAttribute.js#L116">Core/GeometryAttribute.js 116</a>
</div>
</h4>
</div>
<div class="description">
When <code>true</code> and <code>componentDatatype</code> is an integer format,
indicate that the components should be mapped to the range [0, 1] (unsigned)
or [-1, 1] (signed) when they are accessed as floating-point for rendering.
<p>
This is commonly used when storing colors using <a href="global.html#ComponentDatatype#.UNSIGNED_BYTE"><code>ComponentDatatype.UNSIGNED_BYTE</code></a>.
</p>
</div>
<dl class="details">
<span class="details-header">Default Value:</span>
<code class="language-javascript">false</code>
<h5>Example:</h5>
<pre><code class="language-javascript">attribute.componentDatatype = Cesium.ComponentDatatype.UNSIGNED_BYTE;
attribute.componentsPerAttribute = 4;
attribute.normalize = true;
attribute.values = new Uint8Array([
Cesium.Color.floatToByte(color.red),
Cesium.Color.floatToByte(color.green),
Cesium.Color.floatToByte(color.blue),
Cesium.Color.floatToByte(color.alpha)
]);</code></pre>
</dl>
<div class="nameContainer">
<h4 class="name" id="values">
<a href="#values" class="doc-link"></a>
values<span class="type-signature"> : Array.&lt;number>|Int8Array|Uint8Array|Int16Array|Uint16Array|Int32Array|Uint32Array|Float32Array|Float64Array</span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Core/GeometryAttribute.js#L136">Core/GeometryAttribute.js 136</a>
</div>
</h4>
</div>
<div class="description">
The values for the attributes stored in a typed array. In the code example,
every three elements in <code>values</code> defines one attributes since
<code>componentsPerAttribute</code> is 3.
</div>
<dl class="details">
<span class="details-header">Default Value:</span>
<code class="language-javascript">undefined</code>
<h5>Example:</h5>
<pre><code class="language-javascript">attribute.componentDatatype = Cesium.ComponentDatatype.FLOAT;
attribute.componentsPerAttribute = 3;
attribute.values = new Float32Array([
0.0, 0.0, 0.0,
7500000.0, 0.0, 0.0,
0.0, 7500000.0, 0.0
]);</code></pre>
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