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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] → [page:Line] → [page:LineSegments] →
- <h1>顶点切线辅助对象([name])</h1>
- <p class="desc">
- 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
- computeTangents] 计算切线。<br /><br />
- </p>
- <h2>导入</h2>
- <p>
- [name] 是一个附加组件,必须显式导入。请参阅 [link:#manual/introduction/Installation Installation / Addons].
- </p>
- <code>
- import { VertexTangentsHelper } from 'three/addons/helpers/VertexTangentsHelper.js';
- </code>
- <h2>代码示例</h2>
- <code>
- const geometry = new THREE.BoxGeometry( 10, 10, 10, 2, 2, 2 );
- const material = new THREE.MeshStandardMaterial();
- const mesh = new THREE.Mesh( geometry, material );
- const helper = new VertexTangentsHelper( mesh, 1, 0x00ffff );
- scene.add( mesh );
- scene.add( helper );
- </code>
- <h2>例子</h2>
- <p>
- [example:webgl_helpers WebGL / helpers]
- </p>
- <h2>构造函数</h2>
- <h3>[name]( [param:Object3D object], [param:Number size], [param:Hex color] )</h3>
- <p>
- [page:Object3D object] -- 要为其渲染顶点切线的对象。<br />
- [page:Number size] -- (可选)箭头的长度。默认值为 *1*。<br />
- [page:Hex color] --(可选)箭头的十六进制颜色。默认值为 *0x00ffff*。
- </p>
- <h2>属性</h2>
- <p>有关常见属性,请参阅 [page:LineSegments] 基类。</p>
- <h3>[property:Object matrixAutoUpdate]</h3>
- <p>
- 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]。
- </p>
- <h3>[property:Object3D object]</h3>
- <p>对其顶点切线进行可视化的对象。</p>
- <h3>[property:Number size]</h3>
- <p>箭头的长度。默认值为 *1*。</p>
- <h2>方法</h2>
- <p>有关常用方法,请参阅 [page:LineSegments] 基类。</p>
- <h3>[method:undefined update]()</h3>
- <p>根据对象的世界变换更新顶点切线预览。</p>
- <h3>[method:undefined dispose]()</h3>
- <p>
- 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。
- </p>
- <h2>源代码</h2>
- <p>
- [link:https://github.com/mrdoob/three.js/blob/master/examples/jsm/helpers/VertexTangentsHelper.js examples/jsm/helpers/VertexTangentsHelper.js]
- </p>
- </body>
- </html>
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