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three.js
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		[page:Object3D] &rarr; [page:Line] &rarr; [page:LineSegments] &rarr;

		<h1>[name]</h1>

		<p class="desc">极坐标格辅助对象. 坐标格实际上是2维线数组.</p>

		<h2>代码示例</h2>

		<code>
		const radius = 10;
		const sectors = 16;
		const rings = 8;
		const divisions = 64;

		const helper = new THREE.PolarGridHelper( radius, sectors, rings, divisions );
		scene.add( helper );
		</code>

		<h2>例子</h2>

		<p>
			[example:webgl_helpers WebGL / helpers]
		</p>

		<h2>构造函数</h2>

		<h3>[name]( [param:Number radius], [param:Number sectors], [param:Number rings], [param:Number divisions], [param:Color color1], [param:Color color2] )</h3>
		<p>
		radius -- 极坐标格半径. 可以为任何正数. 默认为 10.<br />
		sectors -- The number of sectors the grid will be divided into. This can be any positive integer. Default is 16.<br />
		rings -- The number of rings. This can be any positive integer. Default is 8.<br />
		divisions -- 圆圈细分段数. 可以为任何大于或等于3的正整数. 默认为 64.<br />
		color1 -- 极坐标格使用的第一个颜色. 值可以为 [page:Color] 类型, 16进制 和 CSS 颜色名. 默认为 0x444444 <br />
		color2 -- 极坐标格使用的第二个颜色. 值可以为 [page:Color] 类型, 16进制 和 CSS 颜色名. 默认为 0x888888
		</p>
		<p>
			Creates a new [name] of radius 'radius' with 'sectors' number of sectors and 'rings' number of rings, where each circle is smoothed into 'divisions' number of line segments. Colors are optional.
		</p>

		<h2>源码</h2>

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