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<!DOCTYPE html>
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<html lang="zh">
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<head>
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<meta charset="utf-8" />
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<base href="../../../" />
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<script src="page.js"></script>
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<link type="text/css" rel="stylesheet" href="page.css" />
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</head>
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<body>
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[page:Object3D] → [page:Line] → [page:LineSegments] →
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<h1>顶点切线辅助对象([name])</h1>
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<p class="desc">
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可视化对象的顶点切线。要求已在 [page:BufferAttribute custom attribute] 中指定切线或已使用 [page:BufferGeometry.computeTangents
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computeTangents] 计算切线。<br /><br />
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</p>
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<h2>导入</h2>
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<p>
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[name] 是一个附加组件，必须显式导入。请参阅 [link:#manual/introduction/Installation Installation / Addons].
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</p>
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<code>
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import { VertexTangentsHelper } from 'three/addons/helpers/VertexTangentsHelper.js';
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</code>
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<h2>代码示例</h2>
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<code>
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const geometry = new THREE.BoxGeometry( 10, 10, 10, 2, 2, 2 );
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const material = new THREE.MeshStandardMaterial();
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const mesh = new THREE.Mesh( geometry, material );
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const helper = new VertexTangentsHelper( mesh, 1, 0x00ffff );
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scene.add( mesh );
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scene.add( helper );
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</code>
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<h2>例子</h2>
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<p>
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[example:webgl_helpers WebGL / helpers]
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</p>
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<h2>构造函数</h2>
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<h3>[name]( [param:Object3D object], [param:Number size], [param:Hex color] )</h3>
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<p>
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[page:Object3D object] -- 要为其渲染顶点切线的对象。<br />
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[page:Number size] -- （可选）箭头的长度。默认值为 *1*。<br />
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[page:Hex color] --（可选）箭头的十六进制颜色。默认值为 *0x00ffff*。
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</p>
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<h2>属性</h2>
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<p>有关常见属性，请参阅 [page:LineSegments] 基类。</p>
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<h3>[property:Object matrixAutoUpdate]</h3>
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<p>
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请参阅 [page:Object3D.matrixAutoUpdate]。默认设置为 `false`，因为正在使用对象的 [page:Object3D.matrixWorld matrixWorld]。
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</p>
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<h3>[property:Object3D object]</h3>
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<p>对其顶点切线进行可视化的对象。</p>
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<h3>[property:Number size]</h3>
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<p>箭头的长度。默认值为 *1*。</p>
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<h2>方法</h2>
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<p>有关常用方法，请参阅 [page:LineSegments] 基类。</p>
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<h3>[method:undefined update]()</h3>
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<p>根据对象的世界变换更新顶点切线预览。</p>
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<h3>[method:undefined dispose]()</h3>
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<p>
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释放该实例分配的GPU相关资源。每当您的应用程序中不再使用此实例时，请调用此方法。
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</p>
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<h2>源代码</h2>
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<p>
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[link:https://github.com/mrdoob/three.js/blob/master/examples/jsm/helpers/VertexTangentsHelper.js examples/jsm/helpers/VertexTangentsHelper.js]
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</p>
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</body>
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</html>
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