有什么方法可以从three.js Object3D 中获取边界框? [英] Any way to get a bounding box from a three.js Object3D?

问题描述

我正在使用 Three.js 和 OBJLoader.js 加载 OBJ 文件.这将返回一个 Three.Object3D 对象，它具有您对 3D 模型的期望(位置向量、向上向量...)

I'm loading an OBJ file using Three.js and OBJLoader.js. This returns a Three.Object3D object, which has what you'd expect from a 3D model (position vector, up vector...)

我不知道如何获得它的边界框——这可能吗?

What I can't figure out is how to get a bounding box for it-- is this possible?

推荐答案

您不需要遍历对象的所有子项；库中有一个方法可以做到这一点:THREE.Box3#setFromObject: 查看文档.例如，您可以这样做:

You don't need to iterate over all children of the object; there's a method in the library to do this: THREE.Box3#setFromObject: see the docs. For example, you can do:

var bbox = new THREE.Box3().setFromObject(obj);

获取obj的边界框，包括它的所有子元素，并考虑任何平移、旋转等.

to get the bounding box of obj, including all of its children, and accounting for any translations, rotations, etc.

请注意，BoundingBox 助手旨在在场景中绘制边界框，而不仅仅是计算某个对象的边界框.

Note that the BoundingBox helper is intended to draw a bounding box in the scene, not for just calculating the bounding box of some object.

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