3d 射线检测不到呢?

Creator 2.x
#1

版本2.3.3

        let ray = cc.Camera.main.getRay(touchLocation)
        let results = cc.director.getPhysics3DManager().raycast(ray ,"enemy",1000)
        results 一直是 null

节点设置了刚体和碰撞的.
开启了物理 cc.director.getPhysics3DManager().enabled = true