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unity初探之黑暗之光(2)

一、设置角色跟随鼠标点击移动

思路：使用charactercollider的SimpleMove方法来控制角色的移动。通过摄像机的射线投射到地面，通过屏幕上的一个点也就是鼠标单击的点。该射线与地面发生碰撞返回发生碰撞的点，然后让角色转向该点，开始移动。当移动到一定范围时停止移动。

使用到的方法：

Camera.ScreenPointToRay 屏幕位置转射线

function ScreenPointToRay (position : Vector3) : Ray

Description描述

Returns a ray going from camera through a screen point.

返回一条射线从摄像机通过一个屏幕点。

Resulting ray is in world space, starting on the near plane of the camera and going through position‘s (x,y) pixel coordinates on the screen (position.z is ignored).

产生的射线是在世界空间中，从相机的近裁剪面开始并穿过屏幕position(x,y)像素坐标（position.z被忽略）。

Screenspace is defined in pixels. The bottom-left of the screen is (0,0); the right-top is (pixelWidth,pixelHeight).

屏幕空间以像素定义。屏幕的左下为(0,0)；右上是(pixelWidth,pixelHeight)。

Physics.Raycast 光线投射

static function Raycast (origin : Vector3, direction : Vector3, distance : float = Mathf.Infinity, layerMask : int = kDefaultRaycastLayers) : bool

Parameters参数

• origin
  The starting point of the ray in world coordinates.
  在世界坐标，射线的起始点。
• direction
  The direction of the ray.
  射线的方向。
• distance
  The length of the ray
  射线的长度。
• layerMask
  A Layer mask that is used to selectively ignore colliders when casting a ray.
  只选定Layermask层内的碰撞器，其它层内碰撞器忽略。

• static function Raycast (origin : Vector3, direction : Vector3, out hitInfo : RaycastHit, distance : float = Mathf.Infinity, layerMask : int = kDefaultRaycastLayers) : bool

Parameters参数

• origin
  The starting point of the ray in world coordinates.
  在世界坐标，射线的起始点。
• direction
  The direction of the ray.
  射线的方向。
• distance
  The length of the ray
  射线的长度。
• hitInfo
  If true is returned, hitInfo will contain more information about where the collider was hit (See Also: RaycastHit).
  如果返回true，hitInfo将包含碰到器碰撞的更多信息。
• layerMask
  A Layer mask that is used to selectively ignore colliders when casting a ray.
  只选定Layermask层内的碰撞器，其它层内碰撞器忽略。 

二、绕物相机旋转，拉近拉远

 1 　  public float maxDis = 20f;
 2     public float minDis = 2f;
 3     public int scrollSpeed = 10;
 4     public float distance=0;
 5     public int rotateSpeed = 1;
 6 
 7     private Transform player;
 8     private Vector3 offSet;
 9     private bool isRotate = false;
10     // Use this for initialization
11     void Start () {
12         player = GameObject.FindGameObjectWithTag(Tags.Player).transform;
13         transform.LookAt(player);
14         offSet = transform.position - player.position;//偏位
15     }
16     
17     // Update is called once per frame
18     void Update () {
19         transform.position = player.position + offSet;
20         
21         Rotate();
22         scroll();
23     }
24     //右键控制相机围绕对象旋转
25     void Rotate()
26     {
27         if (Input.GetMouseButtonDown(1))
28         {
29             isRotate = true;
30         }
31         if (Input.GetMouseButtonUp(1))
32         {
33             isRotate = false;
34         }
35 
36         if (isRotate)
37         {
38             Vector3 originalPosion = transform.position;
39             Quaternion originalRotate = transform.rotation;
40 
41             transform.RotateAround(player.position, Vector3.up, rotateSpeed * Input.GetAxis("Mouse X"));
42 
43             print(rotateSpeed * Input.GetAxis("Mouse Y"));
44             transform.RotateAround(player.position, Vector3.right, rotateSpeed * Input.GetAxis("Mouse Y"));
45             float x = transform.eulerAngles.x;
46             if (x > 80||x<10)
47             {
48                 transform.position = originalPosion;
49                 transform.rotation = originalRotate;
50             }
51         }
52         offSet = transform.position - player.position;//重新得到相机与当前人物对象的向量
53     }
54     //滑轮控制镜头远近
55     void scroll()
56     {
57         distance = offSet.magnitude;
58         distance -= Input.GetAxis("Mouse ScrollWheel")*scrollSpeed;
59         distance = Mathf.Clamp(distance, minDis, maxDis);
60         offSet = offSet.normalized * distance;
61     }

使用到的方法：

Transform.RotateAround 围绕旋转

function RotateAround (point : Vector3, axis : Vector3, angle : float) : void

Description描述

Rotates the transform about axis passing through point in world coordinates by angle degrees.

按照angle度通过在世界坐标的point轴旋转物体。

简单的说，按照多少度在世界坐标的某位置轴旋转物体。

This modifies both the position and the rotation of the transform.

这个修改变换的位置和旋转角度。

Input.GetAxis("Mouse X")和Input.GetAxis("Mouse Y")可以分别得到鼠标在水平和垂直方向上拖动的动作信息。

Input.GetAxis("Mouse ScrollWheel")可以获得鼠标滚轮的前后滚动的动作信息。

Vector3.normalized 规范化

var normalized : Vector3

Description描述

Returns this vector with a magnitude of 1 (Read Only).

返回向量的长度为1（只读）。

When normalized, a vector keeps the same direction but its length is 1.0.

当规格化后，向量保持同样的方向，但是长度变为1.0。

Note that the current vector is unchanged and a new normalized vector is returned. If you want to normalize the current vector, use Normalize function.

注意，当前向量是不改变的并且返回一个新的规范化的向量。如果你想规范化当前向量，使用Normalize函数。

If the vector is too small to be normalized a zero vector will be returned.

如果这个向量太小而不能被规范化，一个零向量将会被返回。

unity初探之黑暗之光(2)

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原文地址：http://www.cnblogs.com/Firepad-magic/p/5186903.html