javascript
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three.js
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		[page:LineSegments] &rarr;

		<h1>面法线辅助工具[name]</h1>

		<p class="desc">
			渲染[page:ArrowHelper arrows]来显示物体中[page:Face3 face]（面）的法线。


			Renders [page:ArrowHelper arrows] to visualize an object's [page:Face3 face] normals.
			Requires  that face normals have been specified on all 	[page:Face3 faces] or calculated
			with [page:Geometry.computeFaceNormals computeFaceNormals]. <br /><br />

			请注意，该辅助工具仅在其几何体为[page:Geometry]实例的对象（物体）上工作。
			对于[page:BufferGeometry]，请使用[page:VertexNormalsHelper]。
		<p>


		<h2>示例</h2>

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

		<code>
		geometry = new THREE.BoxGeometry( 10, 10, 10, 2, 2, 2 );
		material = new THREE.MeshBasicMaterial( { color: 0xff0000 } );
		box = new THREE.Mesh( geometry, material );

		helper = new THREE.FaceNormalsHelper( box, 2, 0x00ff00, 1 );

		scene.add( box );
		scene.add( helper );
		</code>

		<h2>构造器</h2>


		<h3>[name]( [param:Object3D object], [param:Number size], [param:Color color], [param:Number linewidth] )</h3>
		<p>
		[page:Object3D object] -- 用于渲染面法线的物体。object for which to render face normals.<br />
		[page:Number size] -- （可选）箭头的长度，默认为*1*。<br />
		[page:Hex color] -- （可选）箭头的颜色，十六进制格式。默认值为*0xffff00*。<br />
		[page:Number linewidth] -- （可选）箭头的线宽，默认值为*1*。
		</p>


		<h2>属性</h2>
		<p>请参阅其基类[page:LineSegments]来查看共有属性。</p>

		<h3>[property:object matrixAutoUpdate]</h3>
		<p>
			请参阅[page:Object3D.matrixAutoUpdate]。在这里将其设置为*false*，
			因为辅助工具使用的是物体的[page:Object3D.matrixWorld matrixWorld]。
		</p>

		<h3>[property:Object3D object]</h3>
		<p>其面法线将会被可视化的物体。</p>

		<h3>[property:Number size]</h3>
		<p>箭头的长度，默认值为*1*。</p>


		<h2>方法</h2>
		<p>请参阅其基类[page:LineSegments]来查看共有方法。</p>


		<h3>[method:null update]()</h3>
		<p>基于物体的移动，更新面法线的预览。Updates the face normal preview based on movement of the object.</p>


		<h2>源代码</h2>

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