006 == RPG相机测试

功能实现：

1、跟随玩家，按住鼠标右键可自由移动相机视觉

2、相机不会到底地下

3、相机不会被遮挡

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

public class CameraFollow : MonoBehaviour 
{
    public const float DISTANCE_DEAFULT = 8.0f;	//默认主角和摄像机的距离
    private float curDistance = 0.0f;			//运行时的距离
	
    private Transform transTarget;				//摄像机跟随目标（主角）
    public float target_offsety = 0.5f;			//盯着目标往上偏移值

    private Vector3 vLooker;					//摄像机盯着的位置
    private Vector3 rotateXY;					//保存X,Y方向的旋转，鼠标移动的时候会发生改变
	
    private float speedAngelX = 200;			//x方向的旋转速度
    private float speedAngelY = 100;			//y方向的旋转速度
	
    public float minAngleAtY = -90.0f;       	//摄像机在Y方向的角度的最小值
    public float maxAngleAtY = 90.0f;       	//摄像机在Y方向的角度的最大值
	
    Quaternion rotation;						//摄像机的旋转角度

	void Start () 
	{
        curDistance = DISTANCE_DEAFULT;
        transTarget = GameObject.FindGameObjectWithTag("Player").transform;
       
        rotation = transform.rotation;
        rotateXY.y = transform.eulerAngles.x;
        rotateXY.x = transform.eulerAngles.y;
        transform.position = transTarget.position + rotation * Vector3.back * curDistance; 
       
	}
	
    void Update()
    {
        vLooker = transTarget.position;
        vLooker.y += target_offsety;

        if (Input.GetMouseButton(1))//0:左键，1：右键，2：中键
        {
            float x = Input.GetAxis("Mouse X");//鼠标在X方向上的移动,控制Y轴的旋转
            float y = Input.GetAxis("Mouse Y");//鼠标在Y方向上的移动,控制X轴的旋转
			
            rotateXY.x += speedAngelX * Time.deltaTime * x;
            rotateXY.y -= speedAngelY * Time.deltaTime * y;
			
			//在最小值和最大值之间取值
            rotateXY.y = Mathf.Clamp(rotateXY.y, minAngleAtY, maxAngleAtY);
			
			//相机旋转
            rotation = Quaternion.Euler(rotateXY.y, rotateXY.x, 0);
            transform.rotation = rotation;
        }
        transform.position = transTarget.position + rotation * Vector3.back * curDistance;
	}

    //一般用在摄像机的控制
	//射线的碰撞检测
    void LateUpdate() 
    {
        if (transTarget)
        {
	   //玩家的位置发送射线
            RaycastHit[] hits = Physics.RaycastAll(new Ray(vLooker, (transform.position - vLooker).normalized));
            curDistance = DISTANCE_DEAFULT;

            List<RaycastHit> listHits = new List<RaycastHit>(hits);
            foreach (RaycastHit hit in listHits)
            {
                if (hit.collider.gameObject.tag == "Player")
                {
                    listHits.Remove(hit);
                    break;
                }
            }
            if (listHits.Count > 0)
            {
                RaycastHit stand = listHits[0];
                foreach (RaycastHit hit in listHits)
                {
                    if (hit.distance < stand.distance)
                    {
                        stand = hit;
                    }
                }
                Debug.Log(stand.point + " " + stand.collider.gameObject.tag);
                string tag = stand.collider.gameObject.tag;
                curDistance = Vector3.Distance(stand.point, vLooker);
                if (curDistance > DISTANCE_DEAFULT)
                {
                    curDistance = DISTANCE_DEAFULT;
                }



                Vector3 position = transTarget.position + rotation * Vector3.back * curDistance;

                //为了不让摄像机看到地下的东西
                position.y += 1.5f;
                transform.position = Vector3.Lerp(transform.position, position, 0.3f);

                transform.LookAt(vLooker);

                Debug.DrawRay(vLooker, position - vLooker, Color.red);

            }

        }

    }
}