鼠标控制物体移动360旋转和视距

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class NewBehaviourScript : MonoBehaviour {
    Color color = Color.blue;
    Color defaultcolor;
    private float fileviewdefault = 60;
    //-----------------------------------
    public float eulery;
    public float eulerx;
    Vector3 angler;
    //Texture2D这里是为了更改鼠标图标所以在设置图片时 Texture2D类型选择Cursor（如果Texture2D为空那么鼠标就是默认的小箭头）
    public Texture2D normalCursor,touch;
    // Use this for initialization
    void Start () {
        //首先获取该物体的默认渲染颜色
        defaultcolor= transform.GetComponent<MeshRenderer>().sharedMaterial.color;
        angler = transform.eulerAngles;
        eulery = angler.y;
        eulerx = angler.x;

    }
    //鼠标接触
    private void OnMouseEnter()
    {
        transform.GetComponent<MeshRenderer>().material.color = color;
       
    }
    //鼠标离开
    private void OnMouseExit()
    {
        transform.GetComponent<MeshRenderer>().material.color = defaultcolor;
        Cursor.SetCursor(touch, Vector2.zero, CursorMode.Auto);
    }
    //鼠标持续接触 持续更新
    private void OnMouseOver()
    {
        // Cursor是鼠标图标的一个类 这里可以设置替换鼠标图标
        Cursor.SetCursor(normalCursor, Vector2.zero, CursorMode.Auto);
        //fieldOfView是主摄像机上的视距实现的功能是 鼠标放在该物体上通过滚轮调节视距
        Camera.main.fieldOfView = Camera.main.fieldOfView + Input.GetAxis("Mouse ScrollWheel") * 20;
        //当一直按下鼠标右键 eulery eulerx会随鼠标的移动数值发生变化
        if (Input.GetMouseButton(1))
        {
            eulery += Input.GetAxis("Mouse X") * 10;
            eulerx += Input.GetAxis("Mouse Y") * 10;
        }
        //当按下 F1视距拉回原来的默认视距
        if (Input.GetKeyDown(KeyCode.F1))
        {
            Camera.main.fieldOfView = fileviewdefault;
        }
    }



    //之所以用协程是因为 unity所有线程必须在主协程调用，否怎你试试unity会卡死在 while的循环中
    IEnumerator OnMouseDown()
    {
        Vector3 wts = Camera.main.WorldToScreenPoint(transform.position);
        Vector3 stw = Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, wts.z));
        var offets = transform.position - stw;
        //当一直按下鼠标左键时执行||此时实现的功能是左键拖动物体移动
        while (Input.GetMouseButton(0))
        {
            Vector3 v1 = Camera.main.WorldToScreenPoint(transform.position);
            Vector3 v2 = Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, v1.z));
            transform.position = v2 + offets;
            yield return new WaitForFixedUpdate();
        }
    }
    //这里接收eulery eulerx值，并插入transform 的旋转插值动画中从而实现360鼠标右键拖动旋转
    private void LateUpdate()
    {
        eulerx = Mathf.Clamp(eulerx, -60, 60);
        Quaternion q = Quaternion.Euler(eulerx, -eulery, 0);
      //  transform.rotation = q;
       transform.rotation = Quaternion.Lerp(transform.rotation,q,Time.deltaTime*5);
    }
}