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<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="utf-8" />
<base href="../../../" />
<script src="list.js"></script>
<script src="page.js"></script>
<link type="text/css" rel="stylesheet" href="page.css" />
</head>
<body>
[page:Object3D] → [page:Line] → [page:LineSegments] →
<h1>[name]</h1>
<p class="desc">
用于图形化地展示对象世界轴心对齐的包围盒的辅助对象。The actual bounding box is handled with [page:Box3], this is just a visual helper for debugging.
It can be automatically resized with the [page:BoxHelper.update] method when the object it's created from is transformed.
注意:要想能正常运行,目标对象必须包含 [page:Geometry] 或 [page:BufferGeometry] ,
所以当目标对象是精灵 [page:Sprite Sprites] 时将不能正常运行.
</p>
<h2>例子</h2>
<div>[example:webgl_helpers WebGL / helpers]</div>
<div>[example:webgl_loader_nrrd WebGL / loader / nrrd]</div>
<div>[example:webgl_buffergeometry_drawcalls advanced / buffergeometry / drawcalls]</div>
<code>
var sphere = new THREE.SphereGeometry();
var object = new THREE.Mesh( sphere, new THREE.MeshBasicMaterial( 0xff0000 ) );
var box = new THREE.BoxHelper( object, 0xffff00 );
scene.add( box );
</code>
<h2>构造函数</h2>
<h3>[name]( [param:Object3D object], [param:Color color] )</h3>
<p>
[page:Object3D object] -- (可选的) 被展示世界轴心对齐的包围盒的对象.<br />
[page:Color color] -- (可选的) 线框盒子的16进制颜色值. 默认为 0xffff00.<br /><br />
创建一个新的线框盒子包围指定的对象. 内部使用 [page:Box3.setFromObject]
方法来计算尺寸. 注意:此线框盒子将包围对象的所有子对象.
</p>
<h2>属性</h2>
<p>请到基类 [page:LineSegments] 页面查看公共属性.</p>
<h2>方法</h2>
<p>请到基类 [page:LineSegments] 页面查看公共方法.</p>
<h3>[method:null update]()</h3>
<p>
更新辅助对象的几何体，与目标对象尺寸
保持一致, 包围目标对象所有子对象. 请查看 [page:Box3.setFromObject].
</p>
<h3>[method:BoxHelper setFromObject]( [param:Object3D object] )</h3>
<p>
[page:Object3D object] - 用于创建辅助对象的目标 [page:Object3D] 对象.<br /><br />
更新指定对象的线框盒子.
</p>
<h2>源码</h2>
<p>
[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]
</p>
</body>
</html>
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