您需要在此处使用A-Frame的底层three.js API。答案有,但这里是A-Frame版本:
// get three.js object from aframe entity
var el = document.querySelector('#my-element');
var object = el.getObject3D('mesh');
// compute bounding box
var bbox = new THREE.Box3().setFromObject(obj);
console.log(bbox.min, bbox.max)