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81 lines
2.2 KiB
81 lines
2.2 KiB
3 years ago
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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] →
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<h1>[name]</h1>
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<p class="desc">
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渲染箭头辅助对象 [page:ArrowHelper arrows] 来模拟顶点的法线.
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需要定义了法线缓存属性 [page:BufferAttribute custom attribute] 或
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使用了 [page:BufferGeometry.computeVertexNormals computeVertexNormals] 方法计算了顶点法线.<br /><br />
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</p>
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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.MeshBasicMaterial( { color: 0xff0000 } );
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const box = new THREE.Mesh( geometry, material );
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const helper = new VertexNormalsHelper( box, 2, 0x00ff00, 1 );
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scene.add( box );
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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], [param:Number linewidth] )</h3>
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<p>
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[page:Object3D object] -- 要渲染顶点法线辅助的对象.<br />
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[page:Number size] -- (可选的) 箭头的长度. 默认为 1.<br />
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[page:Hex color] -- 16进制颜色值. 默认为 0xff0000.<br />
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[page:Number linewidth] -- (可选的) 箭头线段的宽度. 默认为 1.
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</p>
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<h2>属性</h2>
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<p>请到基类 [page:LineSegments] 页面查看公共属性.</p>
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<h3>[property:Object matrixAutoUpdate]</h3>
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<p>
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请查看 [page:Object3D.matrixAutoUpdate]. 这里设置为 *false* 表示辅助对象
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使用对象的世界矩阵 [page:Object3D.matrixWorld matrixWorld].
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</p>
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<h3>[property:Object3D object]</h3>
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<p>被渲染顶点法线辅助的对象.</p>
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<h3>[property:Number size]</h3>
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<p>箭头的长度. 默认为 *1*.</p>
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<h2>方法</h2>
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<p>请到基类 [page:LineSegments] 页面查看公共方法.</p>
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<h3>[method:undefined update]()</h3>
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<p>基于对象的运动更新顶点法线辅助对象.</p>
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<h2>源码</h2>
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<p>
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[link:https://github.com/mrdoob/three.js/blob/master/examples/jsm/helpers/VertexNormalsHelper.js examples/jsm/helpers/VertexNormalsHelper.js]
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</p>
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</body>
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</html>
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