这份代码主要是根据鼠标在屏幕上的移动来操作摄像机

using UnityEngine;using System.Collections;public class LookAt:MonoBehaviour{         public Transform target;//摄像机跟随目标         public float distance;//摄像机跟随距离         public Vector2 mouseAngles;//鼠标在屏幕上的位置         public float yrotationMin;         public float yrotationMax;         public float xspeed;         public float yspeed;         void Start(){                mouseAngles.x=this.target.eulerAngles.x;                mouseAngles.y=this.target.eulerAngles.y;                distance=3;                xspeed=200;                yspeed=100;                yrotationMax=60;                yrotationMin=-30;         }            void LateUpdate(){                 if(target){                        mouseAngles.x+=Input.GetAxis("Mouse X")*xspeed*0.02f;                        mouseAngles.y+=Input.GetAxis("Mouse Y")*yspeed*0.02f;                        mouseAngles.y=transformAngle(mouseAngles.y,yrotationMin,yroataionMax);                         Quaternion rotation=Quaternion.Euler(mouseAngles.y,mouseAngles.x,0);                          //下面代码的作用为 使摄像机朝向目标 并在目标后方distance米处                          Vector3 position=rotation*new Vector3(0.0f,0.0f,-distance)+target.position;                          this.transform.rotation=rotation;                          this.transform.position=position;                 }          }         float transformAngle(float angle,float min,float max){                if(angle<-360)angle+=360;                if(angle>360)angle-=360;                return Mathf.Clamp(angle,min,max);           }}