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[page:Line] →
<h1>[name]</h1>
<div class="desc">Renders [page:ArrowHelper arrows] to visualize an object's [page:Face3 face] normals. Requires that the object's geometry be an instance of [page:Geometry] (does not work with [page:BufferGeometry]), and that face normals have been specified on all [page:Face3 faces] or calculated with [page:Geometry.computeFaceNormals computeFaceNormals].</div>
<h2>Example</h2>
<code>
geometry = new THREE.BoxGeometry( 10, 10, 10, 2, 2, 2 );
material = new THREE.MeshBasicMaterial( { color: 0xff0000 } );
object = new THREE.Mesh( geometry, material );
edges = new THREE.FaceNormalsHelper( object, 2, 0x00ff00, 1 );
scene.add( object );
scene.add( edges );
</code>
[example:webgl_helpers Example using various helpers]
<h2>Constructor</h2>
<h3>[name]( [page:Object3D object], [page:Number size], [page:Color color], [page:Number linewidth] )</h3>
<div>object -- object for which to render face normals
size -- size (length) of the arrows
color -- color of the arrows
linewidth -- width of the arrow lines
</div>
<h2>Properties</h2>
<h3>[property:Object3D object]</h3>
<div>
The attached object
</div>
<h2>Methods</h2>
<h3>[method:null update]()</h3>
<div>Updates the face normal preview based on movement of the object.</div>
<h2>Source</h2>
[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]
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