判断两个物体之间的距离

方法一:

    
    
    
    
01 var aa:GameObject;//A
02 var bb:GameObject;//B
03 var dis: float;
04 function Update () {
05   dis=Vector3.Distance(bb.transform.position,aa.transform.position);
06 }
07
08 function OnGUI () {
09   GUI.Label (Rect (10,40,200,20), dis + "m");
10 }

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方法二:

    
    
    
    
01 var startPoint:Vector3;
02 var endPoint:Vector3;
03 var showDistance:float = 0.0;
04 var isStart:boolean;
05 var isOver:boolean;
06 var isFollow:boolean;
07 var mLine:LineRenderer;
08 var aMaterial:Material;
09 var mx:float = 0.0;
10 var my:float = 0.0;
11
12 function Start ()
13 {
14    mLine = this.gameObject.AddComponent(LineRenderer);
15    mLine.SetWidth(1, 1);
16    mLine.SetVertexCount(2);
17    mLine.SetColors (Color.yellow,Color.yellow);
18    //aMaterial.color = Color.red;
19    mLine.material = aMaterial;
20    mLine.material.color = Color (0, 1, 0, 0.25);
21    mLine.renderer.enabled = true;
22 }
23
24 function Update () {
25 //print(Input.mousePosition);
26 if (Input.GetButtonDown ("Fire1")) {
27    showDistance = 0;
28    startPoint = Vector3.zero;
29    endPoint = Vector3.zero;
30    isFollow = true;
31    var sRay = camera.ScreenPointToRay (Input.mousePosition);
32    var sHit : RaycastHit;
33    if (Physics.Raycast (sRay,sHit)) {
34     //Debug.DrawRay (ray.origin, ray.direction * 10, Color.yellow);
35     //Debug.DrawLine (sRay.origin, sHit.point);
36     startPoint = sHit.point;
37     print("startPoint:" +sHit.point);
38     mLine.SetPosition(0,startPoint);
39     isStart = true;
40     isOver = false;
41    }else{
42     print("");
43    }
44 }
45
46 if(isStart && !isOver){
47    var mRay = camera.ScreenPointToRay (Input.mousePosition);
48    var mHit : RaycastHit;
49    if (Physics.Raycast (mRay,mHit)) {
50     endPoint = mHit.point;
51     print("mPoint:" +mHit.point);
52     mLine.SetPosition(1,endPoint);
53     showDistance = Vector3.Distance(endPoint,startPoint);
54    }else{
55     print("");
56    }
57 }
58
59 if (Input.GetButtonUp ("Fire1")) {
60    var eRay = camera.ScreenPointToRay (Input.mousePosition);
61    var eHit : RaycastHit;
62    isFollow = false;
63    if (Physics.Raycast(eRay,eHit)) {
64     //Debug.DrawRay (ray.origin, ray.direction * 10, Color.yellow);
65     //Debug.DrawLine (eRay.origin, eHit.point);
66     endPoint = eHit.point;
67     print("endPoint:" +eHit.point);
68     isOver = true;
69     isStart = false;
70     showDistance = Vector3.Distance(endPoint,startPoint);
71     //Debug.DrawLine (startPoint,endPoint, Color.red);
72     mLine.SetPosition(1,endPoint);
73    }else{
74     print("");
75    }
76 }
77 }
78
79
80
81
82 function OnGUI () {
83 //GUI.TextArea (Rect (300, 80, 50, 20), showDistance.ToString());
84 if(isFollow){
85    mx = Input.mousePosition.x + 5;
86    my = Screen.height-Input.mousePosition.y - 20;
87 }
88 GUI.Label(Rect (mx,my, 100, 20), showDistance.ToString() + " M");
89 }

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方法三

var a:GameObject;  

    
    
    
    

     
     
     
     
01 var b:GameObject;
02 //a,b 分别定义两个公共GameObject对象//
03 function Update () {
04 if (a==null || b==null) {
05 print("a or b = null");
06 return;
07 //如果a或者是b实例化失败就跳出函数
08 }
09 var m:Vector3;
10 var n:Vector3;
11 //m,n定义两个私有 Vector3类型
12 m=a.transform.position;
13 n=b.transform.position;
14 //赋m,n予a,b的位置
15 print(Vector3.Distance(m,n));
16 //函数Vector3.Distance计算a，b间距，并在控制台输出
17 }