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three.js
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		[page:BufferGeometry] &rarr;

		<h1>挤压缓冲几何体（[name]）</h1>

		<p class="desc">从一个形状路径中，挤压出一个BufferGeometry。</p>

		<iframe id="scene" src="scenes/geometry-browser.html#ExtrudeGeometry"></iframe>

		<script>

		// iOS iframe auto-resize workaround

		if ( /(iPad|iPhone|iPod)/g.test( navigator.userAgent ) ) {

			const scene = document.getElementById( 'scene' );

			scene.style.width = getComputedStyle( scene ).width;
			scene.style.height = getComputedStyle( scene ).height;
			scene.setAttribute( 'scrolling', 'no' );

		}

		</script>

		<h2>代码示例</h2>


		<code>
		const length = 12, width = 8;

		const shape = new THREE.Shape();
		shape.moveTo( 0,0 );
		shape.lineTo( 0, width );
		shape.lineTo( length, width );
		shape.lineTo( length, 0 );
		shape.lineTo( 0, 0 );

		const extrudeSettings = {
			steps: 2,
			depth: 16,
			bevelEnabled: true,
			bevelThickness: 1,
			bevelSize: 1,
			bevelOffset: 0,
			bevelSegments: 1
		};

		const geometry = new THREE.ExtrudeGeometry( shape, extrudeSettings );
		const material = new THREE.MeshBasicMaterial( { color: 0x00ff00 } );
		const mesh = new THREE.Mesh( geometry, material ) ;
		scene.add( mesh );
		</code>


		<h2>构造器</h2>


		<h3>[name]([param:Array shapes], [param:Object options])</h3>
		<p>
		shapes — 形状或者一个包含形状的数组。<br />
		options — 一个包含有下列参数的对象：

			<ul>
				<li>curveSegments — int，曲线上点的数量，默认值是12。</li>
				<li>steps — int，用于沿着挤出样条的深度细分的点的数量，默认值为1。</li>
				<li>depth — float，挤出的形状的深度，默认值为1。</li>
				<li>bevelEnabled — bool，对挤出的形状应用是否斜角，默认值为true。</li>
				<li>bevelThickness — float，设置原始形状上斜角的厚度。默认值为0.2。</li>
				<li>bevelSize — float。斜角与原始形状轮廓之间的延伸距离，默认值为bevelThickness-0.1。</li>
				<li>bevelOffset — float. Distance from the shape outline that the bevel starts. Default is 0.</li>
				<li>bevelSegments — int。斜角的分段层数，默认值为3。</li>
				<li>extrudePath — THREE.Curve对象。一条沿着被挤出形状的三维样条线。Bevels not supported for path extrusion.</li>
				<li>UVGenerator —  Object。提供了UV生成器函数的对象。</li>
			</ul>

		</p>
		<p>
			该对象将一个二维形状挤出为一个三维几何体。
		</p>

		<p>
			当使用这个几何体创建Mesh的时候，如果你希望分别对它的表面和它挤出的侧面使用单独的材质，你可以使用一个材质数组。
			第一个材质将用于其表面；第二个材质则将用于其挤压出的侧面。
		</p>

		<h2>属性</h2>
		<p>共有属性请参见其基类[page:BufferGeometry]。</p>

		<h3>[property:Object parameters]</h3>
		<p>
			一个包含着构造函数中每个参数的对象。在对象实例化之后，对该属性的任何修改都不会改变这个几何体。
		</p>

		<h2>方法(Methods)</h2>
		<p>共有方法请参见其基类[page:BufferGeometry]。</p>

		<h2>源代码</h2>

		<p>
			[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]
		</p>
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