镜头拉远拉近

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using UnityEngine;

public class CameraZoom : MonoBehaviour
{
    private Camera mainCamera;

    public int[] zoomLevel = {60, 40, 20};

    private int currentLevel;


    private void Start()
    {
        mainCamera = GetComponent<Camera>();
    }


    private void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            currentLevel += 1;
            if (currentLevel >= zoomLevel.Length)
            {
                currentLevel = 0;
            }
        }

        int currentFieldOfView = zoomLevel[currentLevel];

        mainCamera.fieldOfView = Mathf.Lerp(mainCamera.fieldOfView, currentFieldOfView, 0.1f);
    }
}