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83 lines
2.4 KiB
83 lines
2.4 KiB
2 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] → [page:LineSegments] →
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<h1>[name]</h1>
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<p class="desc">
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Renders arrows to visualize an object's vertex tangent vectors.
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Requires that tangents have been specified in a [page:BufferAttribute custom attribute] or
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have been calculated using [page:BufferGeometry.computeTangents computeTangents].<br /><br />
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This helper supports [page:BufferGeometry] only.
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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.MeshNormalMaterial();
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const box = new THREE.Mesh( geometry, material );
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const helper = new VertexTangentsHelper( box, 1, 0x00ffff, 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>Constructor</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] -- object for which to render vertex tangents.<br />
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[page:Number size] -- (optional) length of the arrows. Default is *1*.<br />
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[page:Hex color] -- hex color of the arrows. Default is 0x00ffff.<br />
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[page:Number linewidth] -- (optional) width of the arrow lines. Default is *1*. (Setting lineWidth is currently not supported.)
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</p>
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<h2>Properties</h2>
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<p>See the base [page:LineSegments] class for common properties.</p>
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<h3>[property:Object matrixAutoUpdate]</h3>
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<p>
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See [page:Object3D.matrixAutoUpdate]. Set to *false* here as the helper is using the
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objects's [page:Object3D.matrixWorld matrixWorld].
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</p>
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<h3>[property:Object3D object]</h3>
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<p>The object for which the vertex tangents are being visualized.</p>
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<h3>[property:Number size]</h3>
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<p>Length of the arrows. Default is *1*.</p>
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<h2>Methods</h2>
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<p>See the base [page:LineSegments] class for common methods.</p>
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<h3>[method:undefined update]()</h3>
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<p>Updates the vertex tangents preview based on the object's world transform.</p>
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<h2>Source</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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