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- [page:Object3D] → [page:Line] → [page:LineSegments] →
- <h1>[name]</h1>
- <p class="desc">
- 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 />
- Note that this only works with the objects whose geometry is an instance of [page:Geometry].
- For [page:BufferGeometry] use a [page:VertexNormalsHelper] instead.
- <p>
- <h2>Example</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>Constructor</h2>
- <h3>[name]( [param:Object3D object], [param:Number size], [param:Color color], [param:Number linewidth] )</h3>
- <p>
- [page:Object3D object] -- object for which to render face normals.<br />
- [page:Number size] -- (optional) length of the arrows. Default is *1*.<br />
- [page:Hex color] -- (optional) hex color of the arrows. Default is *0xffff00*.<br />
- [page:Number linewidth] -- (optional) width of the arrow lines. Default is *1*.
- </p>
- <h2>Properties</h2>
- <p>See the base [page:LineSegments] class for common properties.</p>
- <h3>[property:object matrixAutoUpdate]</h3>
- <p>
- See [page:Object3D.matrixAutoUpdate]. Set to *false* here as the helper is using the
- objects's [page:Object3D.matrixWorld matrixWorld].
- </p>
- <h3>[property:Object3D object]</h3>
- <p>The object for which the face normals are being visualized.</p>
- <h3>[property:Number size]</h3>
- <p>Length of the arrows. Default is *1*.</p>
- <h2>Methods</h2>
- <p>See the base [page:LineSegments] class for common methods.</p>
- <h3>[method:null update]()</h3>
- <p>Updates the face normal preview based on movement of the object.</p>
- <h2>Source</h2>
- <p>
- [link:https://github.com/mrdoob/three.js/blob/master/examples/jsm/helpers/FaceNormalsHelper.js examples/jsm/helpers/FaceNormalsHelper.js]
- </p>
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