用C#代码完成以下功能：1.完成第一人称操作及镜头控制脚本 2.完成角色持有物体的功能 3.完成物体被扔出的功能 4.完成物体与物体碰撞消失的功能

以下是用C#代码实现以上功能的示例：

1.完成第一人称操作及镜头控制脚本

using UnityEngine;

public class FirstPersonController : MonoBehaviour
{
    public float speed = 5f;
    public float lookSensitivity = 3f;

    private CharacterController controller;
    private Camera cam;

    private float xRotation = 0f;

    void Start()
    {
        controller = GetComponent<CharacterController>();
        cam = GetComponentInChildren<Camera>();

        Cursor.lockState = CursorLockMode.Locked;
    }

    void Update()
    {
        float x = Input.GetAxis("Horizontal");
        float z = Input.GetAxis("Vertical");

        Vector3 move = transform.right * x + transform.forward * z;
        controller.Move(move * speed * Time.deltaTime);

        float mouseX = Input.GetAxis("Mouse X") * lookSensitivity * Time.deltaTime;
        float mouseY = Input.GetAxis("Mouse Y") * lookSensitivity * Time.deltaTime;

        xRotation -= mouseY;
        xRotation = Mathf.Clamp(xRotation, -90f, 90f);

        cam.transform.localRotation = Quaternion.Euler(xRotation, 0f, 0f);
        transform.Rotate(Vector3.up * mouseX);
    }
}

2.完成角色持有物体的功能

using UnityEngine;

public class PickupObject : MonoBehaviour
{
    public float pickupRange = 5f;

    private GameObject heldObject;

    void Update()
    {
        if (Input.GetKeyDown(KeyCode.E))
        {
            if (heldObject == null)
            {
                RaycastHit hit;
                if (Physics.Raycast(transform.position, transform.forward, out hit, pickupRange))
                {
                    heldObject = hit.collider.gameObject;
                    heldObject.transform.parent = transform;
                    heldObject.transform.localPosition = Vector3.zero;
                    heldObject.GetComponent<Rigidbody>().isKinematic = true;
                }
            }
            else
            {
                heldObject.transform.parent = null;
                heldObject.GetComponent<Rigidbody>().isKinematic = false;
                heldObject = null;
            }
        }
    }
}

3.完成物体被扔出的功能

using UnityEngine;

public class ThrowObject : MonoBehaviour
{
    public float throwForce = 10f;

    private GameObject heldObject;

    void Update()
    {
        if (Input.GetKeyDown(KeyCode.Mouse0))
        {
            if (heldObject != null)
            {
                heldObject.transform.parent = null;
                heldObject.GetComponent<Rigidbody>().isKinematic = false;
                heldObject.GetComponent<Rigidbody>().AddForce(transform.forward * throwForce, ForceMode.Impulse);
                heldObject = null;
            }
        }
    }
}

4.完成物体与物体碰撞消失的功能

using UnityEngine;

public class DestroyOnCollision : MonoBehaviour
{
    void OnCollisionEnter(Collision collision)
    {
        Destroy(gameObject);
    }
}