unity相机运动并在撞到碰撞后停止往运动的那个方向运动

一个简单的测试，wasd可以控制相机运动，右键可以控制旋转角度，当相机移动到距离碰撞距离超过所设定的距离时，停止往移动的方向移动，主要利用射线检测距离的功能。

using UnityEngine;
using System.Collections;


public class FlyCamera : MonoBehaviour {
    public float _mFSpeed = 250f;
    public float _mMaxSpeed = 500.0f;
    public float _mMinSpeed = 0.1f;

    /// <summary>
    /// 旋转轴向控制
    /// </summary>
    public enum RotateAxes {
        MouseXAndY=0,
        MouseX=1,
        MouseY=2
    }
    /// <summary>
    /// 实际使用的旋转轴向 
    /// </summary>
    public RotateAxes _mRotateAxes = RotateAxes.MouseXAndY;

    /// <summary>
    /// X轴向分量
    /// </summary>
    public float _mFsensitivityX = 12.0f;

    /// <summary>
    /// Y轴向分量
    /// </summary>
    public float _mFSensitivityY = 12.0f;

    /// <summary>
    /// X轴向最小旋转角度
    /// </summary>
    public float _mFminiX = -360.0f;
    
    /// <summary>
    /// X轴向最大旋转角度
    /// </summary>
    public float _mFmaxX = 360.0f;

    /// <summary>
    /// Y轴最小旋转角度
    /// </summary>
    public float _mFminiY = -60.0f;

    /// <summary>
    /// Y轴最大旋转速度
    /// </summary>
    public float _mFmaxY = 60.0f;

    /// <summary>
    /// Y轴向旋转
    /// </summary>
    float _mFrotateY = 0.0f;
	
	public float _mLimitHeight=1.2f;
	public bool _mCanLimitHeight=false;

    
    public float _mPadRotAngle = 8.0f;

	public enum RotateMode{
		RotateByMoveMouse=0,
		RotateByRightMouseButton=1
	}
	
	public  RotateMode _mRotMode=RotateMode.RotateByRightMouseButton;

    private Vector2 _mFirstVec = Vector2.zero, _mSceondVec = Vector2.zero;
       	
    void Awake() {
        _mCanLimitHeight = false;
        _mFirstVec=Vector2.zero;
        _mSceondVec=Vector2.zero;

        Hide("UI");                
    }
	
    void FixedUpdate () {
      		if(Input.GetKey(KeyCode.Delete)){
                if(Input.GetKeyDown(KeyCode.B)){
                    _mCanLimitHeight = !_mCanLimitHeight;
                }
            }

            if(_mCanLimitHeight){
      			transform.localPosition=new Vector3 (transform.localPosition.x,_mLimitHeight,transform.localPosition.z);
      		}
    }
	
	void Update () {
        _MoveCamera();
        if(_mRotMode==RotateMode.RotateByMoveMouse){
        	_RotateCamera(0);
        }else{
            _RotateCamera(1);
        }
        _ModifySpeed();

	}

    void _ModifySpeed() {
        if (Input.GetKeyDown(KeyCode.KeypadPlus)) {
            _mFSpeed+=0.1f;
            if (_mFSpeed >= _mMaxSpeed) _mFSpeed = _mMaxSpeed;
            //print(_mFSpeed);
        }

        if (Input.GetKeyDown(KeyCode.KeypadMinus)) {
            _mFSpeed -= 0.1f;
            if (_mFSpeed <= _mMinSpeed) _mFSpeed = _mMinSpeed;
            //print(_mFSpeed);
        }
    }

    void _MoveCamera() {
        if (Input.GetKey(KeyCode.W) && CanMove(transform.forward)) transform.Translate(Vector3.forward * Time.deltaTime * _mFSpeed);

        if (Input.GetKey(KeyCode.S) && CanMove(-transform.forward)) transform.Translate(Vector3.back * Time.deltaTime * _mFSpeed);

        if (Input.GetKey(KeyCode.A) && CanMove(-transform.right)) transform.Translate(Vector3.left * Time.deltaTime * _mFSpeed);

        if (Input.GetKey(KeyCode.D) && CanMove(transform.right)) transform.Translate(Vector3.right * Time.deltaTime * _mFSpeed);

        if (Input.GetKey(KeyCode.Q) && CanMove(transform.up)) transform.Translate(Vector3.up * Time.deltaTime * _mFSpeed);

        if (Input.GetKey(KeyCode.E) && CanMove(-transform.up)) transform.Translate(Vector3.down * Time.deltaTime * _mFSpeed);
       
    }
   
    void _RotateCamera(int m_MouseKeycodeNumber) {
        
        if(Input.GetMouseButton(m_MouseKeycodeNumber)){
        		 if (_mRotateAxes == RotateAxes.MouseXAndY) {
	           
	            float rotateX = transform.localEulerAngles.y + Input.GetAxis("Mouse X") * _mFsensitivityX;
	
	          
	            _mFrotateY += Input.GetAxis("Mouse Y") * _mFSensitivityY;
	           
	            _mFrotateY = Mathf.Clamp(_mFrotateY, _mFminiY, _mFmaxY);
	
	          
	           transform.localEulerAngles = new Vector3(-_mFrotateY, rotateX,0);
	           //Debug.Log("MouseXY");
	           }else if(_mRotateAxes==RotateAxes.MouseX){
		           
		            transform.Rotate(0, Input.GetAxis("Mouse X") * _mFsensitivityX, 0);
		            //Debug.Log("MouseX");
		        }else{
		           
		            _mFrotateY += Input.GetAxis("Mouse Y") * _mFSensitivityY;
		
		           
		            _mFrotateY = Mathf.Clamp(_mFrotateY, _mFminiY, _mFmaxY);
	
		           transform.localEulerAngles = new Vector3(-_mFrotateY, transform.localEulerAngles.y, 0);
		           //Debug.Log("MouseY");
		       }
        }
     

        }

    private void Hide(string someLayer)
    {
        GetComponent<Camera>().cullingMask &= ~(1 << LayerMask.NameToLayer(someLayer));
    }
    private RaycastHit _hit;
    public float rayLength = 0.5f;
    /// <summary>
    /// 相机距离检测与设定距离对比并返回是否运动的判断
    /// </summary>
    /// <param name="dir">本物体所朝的方向</param>
    /// <returns></returns>
    bool CanMove(Vector3 dir)
    {
        Ray ray = new Ray(transform.position, dir);

        //if (Physics.Raycast(ray, out _hit, RayLength, 1 << LayerMask.NameToLayer("wall")))
        if (Physics.Raycast(ray, out _hit, rayLength))
        {
            //print(_hit.transform.name);
            return false;
        }

        return true;
    }
}

工程的下载地址链接：链接: https://pan.baidu.com/s/1nhjrJ6eKB68oUfINPGcwQQ 密码: kd8r 。

unity版本：Unity 2017.3.1p4

大家有好的想法，可以写一下