相机跟随效果的实现
固定距离相机跟随（带有角度旋转）
using UnityEngine;
using System.Collections;
using UnityEditor;
public class CameraFlow : MonoBehaviour
{
public Transform target;
//平滑系数
public float smoothing = 1.2f;
//移动速度
public float speed = 10;
//相机与目标保持的距离
private Vector3 offset;
// Use this for initialization
void Start ()
{
offset = target.position - transform.position;
}
// Update is called once per frame
void Update ()
{
var ps = Vector3.Lerp(transform.position, target.position - offset, Time.deltaTime* speed *smoothing);
transform.position = ps;
//角度旋转
transform.rotation = Quaternion.Slerp(transform.rotation, angle, Time.deltaTime*speed);
Debug.DrawLine(Vector3.zero,Vector3.forward,Color.blue);
Debug.DrawLine(Vector3.zero,Vector3.up,Color.green);
Debug.DrawLine(Vector3.zero,Vector3.right,Color.red);
}
}
这里用到了一个Quaternion.lookRotation 方法，他与 transform.lookAt 有点相像，一开始我也有点迷糊，后来明白他们还是不同的：
- lookAt 始终是 自身的Z轴（forward）对着目标位置
- lookRotation 可以是随意一个角度对准目标位置。
如下图：
猪脚不在是用正前方（z轴）而是歪着头看向妹子的，不管妹子移动到什么地方，都保持这个方向的姿势看向妹子。
相机跟随玩家，一直显示玩家的后面（滚轮缩放视野fieldView）
using UnityEngine;
using System.Collections;
using UnityEditor;
public class CameraFlow : MonoBehaviour
{
public Transform target;
public float smooth = 2f;
//相机控制视野缩放的速度
public float cameraDeepSmooth = 50f;
//限定视野范围
public float minFieldView = 30f;
public float maxFieldView = 90f;
//相机与目标上下的距离
public float distanceUp = 15f;
//相机与目标前后的距离
public float distanceAway = 10f;
// Use this for initialization
void Start ()
{
}
// Update is called once per frame
void Update ()
{
//鼠标滚轮 控制视野大小
Camera.main.fieldOfView -= Input.mouseScrollDelta.y*Time.deltaTime*cameraDeepSmooth;
Camera.main.fieldOfView = Mathf.Clamp(Camera.main.fieldOfView,minFieldView, maxFieldView);
}
void LateUpdate()
{
var disPos = target.position + Vector3.up*distanceUp + Vector3.back*distanceAway;
transform.position = Vector3.Lerp(transform.position, disPos, Time.deltaTime*smooth);
transform.LookAt(target.position);
}
}
`
先说下视野的问题，正常情况下人的视野是固定大小的，看桌子上的一个杯子，走近时杯子在你视野中所占的比例变大，就感觉变大了，相反变小。
//鼠标滚轮 控制视野大小
Camera.main.fieldOfView -= Input.mouseScrollDelta.y*Time.deltaTime*cameraDeepSmooth;
Camera.main.fieldOfView = Mathf.Clamp(Camera.main.fieldOfView,minFieldView, maxFieldView);
当鼠标滚轮朝前滚动时候 Input.mouseScrollDelta.y 为正数，越滚fieldOfview数值越小，看到的物体就越大
var disPos = target.position + Vector3.up*distanceUp + Vector3.back*distanceAway;
这里限定了相机的位置，在目标的上面，然后具体目标的屁股一段距离，也可以这么写
var disPos = target.position + Vector3.up*distanceUp - Vector3.forward*distanceAway;
都是一样的
最后使相机的Z轴始终对着目标位置
transform.LookAt(target.position);
相机跟随，通过鼠标进行上下左右旋转
using UnityEngine;
using System.Collections;
using UnityEditor;
public class CameraFlow : MonoBehaviour
{
public Transform target;
public Vector3 offset ;
public float cameraDeepth = 20f;
public Vector3 rotateAroundPostion;
// Use this for initialization
void Start ()
{
offset = transform.position - target.position;
rotateAroundPostion = target.position;
}
// Update is called once per frame
void Update()
{
//偏移的长度 + 滚轮的delta
var dis = offset.magnitude + Input.mouseScrollDelta.y*cameraDeepth*Time.deltaTime;
dis = Mathf.Clamp(dis, 1.2f, 10f);
//对象的位置 = 单位向量 x 距离 + 目标的位置
transform.position = target.position + offset.normalized*dis;
//重新计算偏移
offset = transform.position - target.position;
//button values are 0 for left button, 1 for right button, 2 for the middle button.
if (Input.GetMouseButton(0))
{
//根据鼠标的拉扯 相机围绕世界坐标系点旋转
transform.RotateAround(rotateAroundPostion,Vector3.up,Input.GetAxis("Mouse X") * 5);
transform.RotateAround(rotateAroundPostion, Vector3.right, Input.GetAxis("Mouse Y") * 5);
}
}
}
简单的 MouseLook 和 Carmera Orbit
using UnityEngine;
using System.Collections;
public class MouseOrbit : MonoBehaviour
{
public Transform target ;
public void Update()
{
if (target != null)
{
transform.LookAt(target.position);
if (Input.GetMouseButton(0))
{
transform.RotateAround(target.position, Vector3.up, Input.GetAxis("Mouse X") * 10);
transform.RotateAround(target.position, Vector3.right, Input.GetAxis("Mouse Y")*-10);
}
}
}
}
鼠标左右上下滑动控制围绕目标的旋转