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[page:BufferGeometry] →
<h1>圆环缓冲几何体（[name]）</h1>
<p class="desc">一个用于生成二维圆环几何体的类。</p>
<iframe id="scene" src="scenes/geometry-browser.html#RingGeometry"></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 geometry = new THREE.RingGeometry( 1, 5, 32 );
const material = new THREE.MeshBasicMaterial( { color: 0xffff00, side: THREE.DoubleSide } );
const mesh = new THREE.Mesh( geometry, material );
scene.add( mesh );
</code>
<h2>构造器</h2>
<h3>[name]([param:Float innerRadius], [param:Float outerRadius], [param:Integer thetaSegments], [param:Integer phiSegments], [param:Float thetaStart], [param:Float thetaLength])</h3>
<p>
innerRadius — 内部半径，默认值为0.5。 <br />
outerRadius — 外部半径，默认值为1。<br />
thetaSegments — 圆环的分段数。这个值越大，圆环就越圆。最小值为3，默认值为32。<br />
phiSegments — 最小值为1，默认值为8。<br />
thetaStart — 起始角度，默认值为0。<br />
thetaLength — 圆心角，默认值为Math.PI * 2。
</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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