Three.js：有没有办法获取组的边界框

我可以为 Threejs.js 中的组获取​​边界框吗？我在 Three.js 中有一个对象列表，我将它们全部分组在一个单元中。我想获取组的高度和宽度，所以我尝试使用 Box3 来确定高度和宽度。有什么方法可以获取 Threejs 中对象组的高度和宽度

var geometry = new THREE.BoxBufferGeometry( 1, 1, 1 );
var material = new THREE.MeshBasicMaterial( {color: 0x00ff00} );

var cubeA = new THREE.Mesh( geometry, material );
cubeA.position.set( 100, 100, 0 );

var cubeB = new THREE.Mesh( geometry, material );
cubeB.position.set( -100, -100, 0 );

//create a group and add the two cubes
//These cubes can now be rotated / scaled etc as a group
var group = new THREE.Group();
group.add( cubeA );
group.add( cubeB );

scene.add( group );

Use Box3.setFromObject() https://threejs.org/docs/index.html#api/en/math/Box3.setFromObject计算一组对象的 AABB。代码示例：

const aabb = new THREE.Box3();
aabb.setFromObject( group );

three.js R118