Threejs raycast不与collada模型相交

Question

在使用threejs选择collada模型的不同部分时遇到问题。使用raycaster，我能够检测到网格，但是无法检测到collada模型（在中间）。 click here for image

这是我的代码块。

 MouseDownListener: function(event)  {
            this.projector = new THREE.Projector();
            console.log("Mouse DOWN");
            this.vector = new THREE.Vector3(( event.clientX / window.innerWidth ) * 2 - 1, -( event.clientY / window.innerHeight ) * 2 + 1, 0.5);
            this.projector.unprojectVector(this.vector, this.camera);
            this.raycaster = new THREE.Raycaster(this.camera.position, this.vector.sub(this.camera.position).normalize());
            
            var intersects = this.raycaster.intersectObjects([this.cube, this.cube2, this.dae]);
            
        },