用于鼠标拾取的OBJMTLLoader对象周围的three.js boundingBox

Question

我正在寻找一个解决方案来获取我用OBJMTLLoader加载的对象周围的边界框。我需要这个，因为我加载的Object对我的鼠标拾取方法没有反应，所以我会尝试使用boundingBox运行它。

这就是我最后的尝试：

function furnitureII(){
var loaderI = new THREE.OBJMTLLoader();
loaderI.load('models/lettoCiliegio.obj', 'models/lettoCiliegio.mtl', function(object) {
    var bbox = new THREE.Box3().setFromObject(object);    
    object.position.z = 5;
    object.position.y = -5.95;
    object.position.x = 10;
    object.scale.set(0.05,0.05,0.05);
    scene.add(bbox);
});    
}

错误：TypeError：bbox.position未定义 如果我为盒子设置位置，它也不起作用。

function furnitureII(){
var loaderI = new THREE.OBJMTLLoader();
loaderI.load('models/lettoCiliegio.obj', 'models/lettoCiliegio.mtl', function(object) {
    var bbox = new THREE.Box3().setFromObject(object); 
    bbox.position.set(2,-4,0);
    object.position.z = 5;
    object.position.y = -5.95;
    object.position.x = 10;
    object.scale.set(0.05,0.05,0.05);
    scene.add(bbox);
});}