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<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="utf-8" />
<base href="../../../" />
<script src="page.js"></script>
<link type="text/css" rel="stylesheet" href="page.css" />
</head>
<body>
[page:Object3D] &rarr; [page:Line] &rarr; [page:LineSegments] &rarr;
<h1>[name]</h1>
<p class="desc">
Renders arrows to visualize an object's vertex tangent vectors.
Requires that tangents have been specified in a [page:BufferAttribute custom attribute] or
have been calculated using [page:BufferGeometry.computeTangents computeTangents].<br /><br />
This helper supports [page:BufferGeometry] only.
</p>
<h2>代码示例</h2>
<code>
const geometry = new THREE.BoxGeometry( 10, 10, 10, 2, 2, 2 );
const material = new THREE.MeshNormalMaterial();
const box = new THREE.Mesh( geometry, material );
const helper = new VertexTangentsHelper( box, 1, 0x00ffff, 1 );
scene.add( box );
scene.add( helper );
</code>
<h2>例子</h2>
<p>
[example:webgl_helpers WebGL / helpers]
</p>
<h2>Constructor</h2>
<h3>[name]( [param:Object3D object], [param:Number size], [param:Hex color], [param:Number linewidth] )</h3>
<p>
[page:Object3D object] -- object for which to render vertex tangents.<br />
[page:Number size] -- (optional) length of the arrows. Default is *1*.<br />
[page:Hex color] -- hex color of the arrows. Default is 0x00ffff.<br />
[page:Number linewidth] -- (optional) width of the arrow lines. Default is *1*. (Setting lineWidth is currently not supported.)
</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 vertex tangents 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:undefined update]()</h3>
<p>Updates the vertex tangents preview based on the object's world transform.</p>
<h2>Source</h2>
<p>
[link:https://github.com/mrdoob/three.js/blob/master/examples/jsm/helpers/VertexTangentsHelper.js examples/jsm/helpers/VertexTangentsHelper.js]
</p>
</body>
</html>