挑选和抛出预制模型

Question

我正在使用此代码进行立方体拾取和投掷，但是当我使用此代码来挑选预制模型（在我的情况下灭火器）时，它不起作用..请帮助我..代码附加到多维数据集。 实际上我想选择灭火器并想用来解决火灾，但我无法挑选灭火器。我正在使用灭火器的资产。

void start() {
    mainCamera = GameObject.FindWithTag("MainCamera");
}
void Update()
{
    if (carrying)
    {
        carry(carryObject);
        checkDrop();
    }
    else
    {
        pickup();
    }
}
void carry(GameObject o)
{
    o.transform.position = Vector3.Lerp(o.transform.position,Camera.main.transform.position + Camera.main.transform.forward * distance,Time.deltaTime * smooth);
}
void pickup()
{
//  PickupCube.Addcomponent(Rigidbody);

    if (Input.GetKeyDown(KeyCode.F))
    {
        int x = Screen.width / 2;
        int y = Screen.height / 2;
        Ray ray =Camera.main.ScreenPointToRay(new Vector3(x, y));
        RaycastHit hit;
        if (Physics.Raycast(ray, out hit))
        {
            PickupCube p = hit.collider.GetComponent<PickupCube>();
            if (p != null)
            {
                carrying = true;
                carryObject = p.gameObject;
                p.gameObject.GetComponent<Rigidbody>().isKinematic = true;
            }
        }
    }
}
// Update is called once per frame

void checkDrop(){
    if (Input.GetKeyDown (KeyCode.F)) 
        dropObject();
}
void dropObject(){
    carrying = false;
    carryObject.gameObject.GetComponent<Rigidbody>().isKinematic = false;
    carryObject = null;
}

}