加载gltf文件的代码如下：

function loadGLTF(path, fileName) {
      var loader = new THREE.GLTFLoader();
      loader.load(`${path}${fileName}.gltf`, function (gltf) {
      
        let object = gltf.scene;
        object.scale.set(scale, scale, scale);
        scene.add(object);
      });
    }

这里加载出来的object是一个scene。
点击代码如下：

 window.addEventListener("mousedown", mousedown);
    var raycaster = new THREE.Raycaster();
    var mouse = new THREE.Vector2();
    function mousedown() {
      mouse.x = e.clientX / renderer.domElement.clientWidth * 2 - 1;
      mouse.y = -(e.clientY / renderer.domElement.clientHeight * 2) + 1;
      raycaster.setFromCamera(mouse, camera);
      var intersects = raycaster.intersectObjects(scene.children);
      if (intersects.length > 0) {
        console.log(intersects[0].object);
      }
    }

点击时，点击不到加载的gltf物体，返回的总是空，或者是其它非加载的物体。