滚轮拉近相机

using UnityEngine;
using System.Collections;

public class CubeStatic : MonoBehaviour
{

public float minFov = 15f;
public float maxFov = 90f;
public float sensitivity = 10f;

void Update()
{
float fov = Camera.main.fieldOfView;
fov += Input.GetAxis("Mouse ScrollWheel") * sensitivity;
fov = Mathf.Clamp(fov, minFov, maxFov);
Camera.main.fieldOfView = fov;
}
}

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