利用射线实现鼠标控制角色转向和移动

1 using UnityEngine;
2 using System.Collections;
3
4 public class Test : MonoBehaviour {
5
6     private bool flagMove;
7     private RaycastHit hit;
8     private Vector3 mousePos;
9     private Vector3 targetDir;
10     // Use this for initialization
11     void Start ()
12     {
13         flagMove = false;
14     }
15
16     void Update ()
17     {
18
19         if(Input.GetMouseButtonDown(0))
20         {
21             RayControl();
22         }
23         if(flagMove)
24         {
25             if(Vector3.Distance(transform.position,mousePos)>0.1)
26             {
27                 transform.Translate(transform.worldToLocalMatrix* transform.right * Time.deltaTime*0.5f);
28             }
29             else
30             {
31                 flagMove=false;
32             }
33         }
34     }
35
36     void RayControl()
37     {
38          Ray ray=Camera.main.ScreenPointToRay(Input.mousePosition);//从Camera发射射线到屏幕
39          if(Physics.Raycast(ray,out hit))//射线碰撞检测
40          {
41              mousePos=hit.point;
42                mousePos.z=transform.position.z;
43               targetDir=mousePos-transform.position;//计算到目标点的方向
44               Vector3 tempDir=Vector3.Cross(transform.right,targetDir.normalized);
45              float dotValue=Vector3.Dot(transform.right,targetDir.normalized);
46              float angle=Mathf.Acos(dotValue)*Mathf.Rad2Deg;//计算夹角
47              if(tempDir.z < 0)//根据叉乘判断夹角的正负
48              {
49                  angle=angle*(-1);
50              }
51              if(!float.IsNaN(angle))
52              {
53                 transform.RotateAround(transform.position,Vector3.forward,angle);//转向目标点
54              }
55
56              flagMove=true;
57         }
58     }
59 }