【精华】鼠标控制摄像机 （Mouse Orbit与Mouse Look合二为一）

（二.添加光线判断距离伸远缩进和人物透明）

//效果就是左右鼠标晃动改变人物x轴的轴向，//——–上下晃动改变摄像机围绕人朝向
//滚动滚轮伸远缩进
//距离近了使人物身上的材质隐藏

//改变人物透明度的时候需要右键添加一个"Material"透明材质 shader里面选择 Transparent下的Diffuse

using UnityEngine;
using System.Collections;

public class CameraWhirl : MonoBehaviour {

    public GameObject target;
    //旋转度数
    float rotationX = 0F;
    float rotationY = 0F;

    //灵敏度
    public float sensitivityX = 5F;
    public float sensitivityY = 5F;
    public float sensitivityZ = 5F;

    //旋转范围
    public float minimumX = -360F;
    public float maximumX = 360F;
    public float minimumY = -90F;
    public float maximumY = 90F;

    public float minimumZ = -20F;
    public float maximumZ = 0.1F;

    //相机与主角的距离
    public float distance=-3.0F;

    Quaternion originalRotation;
    Vector3 angles ;
    // Use this for initialization
    void Start () {
        distance=-3.0F;
        originalRotation =target.transform.localRotation;
        angles = transform.eulerAngles;
    }

    // Update is called once per frame
    void Update () {
    //滚动鼠标中轮    镜头缩进伸远
    distance += Input.GetAxis("Mouse ScrollWheel")*sensitivityZ;
    //~ mousescrollwheel_z += Input.GetAxis("Mouse ScrollWheel")*sensitivityZ;
    if(distance>maximumZ)
    {
        distance=maximumZ;
        }else if(distance<minimumZ)
        {
            distance=minimumZ;
        }

    //x轴                 //——–左右晃动改变人物x轴的轴向
    rotationX+=Input.GetAxis("Mouse X")*sensitivityX;
    rotationX = ClampAngle (rotationX, minimumX, maximumX);
    Quaternion xQuaternion = Quaternion.AngleAxis (rotationX, Vector3.up);
    target.transform.localRotation = originalRotation * xQuaternion;

    //~ print("X:"+Input.GetAxis("Mouse X")+"    "+"Y:"+Input.GetAxis("Mouse Y"));
    //~ print("Q4:"+target.transform.localRotation);

    //Y轴      //——–上下晃动改变摄像机围绕人朝向
    rotationY+=Input.GetAxis("Mouse Y")*sensitivityY;
    rotationY = ClampAngle (rotationY, minimumY, maximumY);
    Quaternion rotation = Quaternion.Euler(-rotationY,rotationX, 0);
    transform.rotation = rotation;
    float R1=distance;        //用来控制摄像机和人物的距离
    //碰撞缩进伸远————
    RaycastHit hit;
    Vector3 spacevector =transform.position- target.transform.position;
    if (Physics.Raycast (target.transform.position,spacevector, out hit,-R1)) {
        //   print (hit.point+"      "+(hit.point- target.transform.position).magnitude);
        Debug.DrawLine (target.transform.position, hit.point);
        R1=-(hit.point- target.transform.position).magnitude;     //碰撞点和人物坐标的距离
    }
    //—————————-
    Vector3 V3=new Vector3(0.0F, 0.0F, R1);
    transform.position =rotation*V3+target.transform.position;      //用来控制摄像机和人物的距离

    //人物透明
    if(R1>-1.5F&&R1<-0.8)
    {
        target.renderer.material.color = new Color (1F, 1F,1F, 0.3F);
    }
    else if(R1>-0.8)
    {
        target.renderer.material.color = new Color (1F, 1F,1F, 0F);
        }else
        {
            target.renderer.material.color = new Color (1F, 1F,1F,1F);
        }
    }

    public static float ClampAngle (float angle, float min, float max)
    {
        if (angle < -360F)
        angle += 360F;
        if (angle > 360F)
        angle -= 360F;
        return Mathf.Clamp (angle, min, max);
    }
}

//不足的地方1.人物透明不是插值2.摄像机向上看的时候能看到地的下面

不足的地方

1. 人物透明不是插值
2. 摄像机向上看的时候能看到地的下面