本章代码基于前两章。
1. 我们新建CameraController脚本，将其挂载到Camera上
2. 在角色Player下新建一个空物体，命名为cameraTargetPoint，并将该物体挂载至CameraController脚本中【注意代码中的这行：public Transform cameraTargetPoint;】，将该空物体放在人物头部附近位置
3.将PlayerController脚本绑定至CameraController中【public PlayerController playerController;】
4.本章代码的实现原理是让摄像机对准空物件，并保持一定距离
5. 具体代码如下
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class CameraController : MonoBehaviour
{
private static float lower_upper_bound = 60f;
public Transform cameraTargetPoint;
public float cameraDistance = 5.0f;
public Vector2 verticalRange = new Vector2(-lower_upper_bound, lower_upper_bound);
public float cameraSensitivity = 120f;
private Transform verticalObj;
private Transform horizontalObj;
private float horizontalValue;
private float verticalValue;
public PlayerController playerController;
// Start is called before the first frame update
void Start()
{
horizontalObj = new GameObject("Camera Horizontal").transform;
horizontalObj.SetParent(cameraTargetPoint);
horizontalObj.localPosition = Vector3.zero;
horizontalObj.localRotation = Quaternion.identity;
verticalObj = new GameObject("Camera Vertical").transform;
verticalObj.SetParent(horizontalObj);
verticalObj.localPosition = Vector3.zero;
verticalObj.localRotation = Quaternion.identity;
transform.SetParent(verticalObj);
transform.localPosition = new Vector3(0,0,-cameraDistance);
transform.localRotation = Quaternion.identity;
}
// Update is called once per frame
void Update()
{
cameraMoving();
DoNotTouchTheGround();
}
private void cameraMoving()
{
horizontalValue += Input.GetAxis("Mouse X") * Time.deltaTime * cameraSensitivity;
horizontalObj.localRotation = Quaternion.Euler(new Vector3(0, horizontalValue, 0));
verticalValue += Input.GetAxis("Mouse Y") * Time.deltaTime * cameraSensitivity;
verticalValue = Mathf.Clamp(verticalValue, verticalRange.x, verticalRange.y);
verticalObj.localRotation = Quaternion.Euler(new Vector3(-verticalValue, 0, 0));
}
private void DoNotTouchTheGround() // 摄像机与角色点中间有物体时，让摄像机处于物体前，避免遮挡
{
Vector3 distanceVec = transform.position - cameraTargetPoint.position;
float distance = distanceVec.magnitude;
RaycastHit hit;
if(Physics.Raycast(cameraTargetPoint.position,distanceVec, out hit,distance))
{
if(hit.transform.tag != "Player")
{
transform.position = hit.point;
}
else
{
transform.localPosition = Vector3.Lerp(transform.localPosition, new Vector3(0, 0, -distance), 0.3f);
}
}
else
{
transform.localPosition = Vector3.Lerp(transform.localPosition, new Vector3(0, 0, -distance), 0.3f);
}
}
}
Tips:以上代码中，DoNotTouchTheGround()方法不是必须的，该方法是用于限制当摄像机与角色之间有障碍物时，把摄像机放在障碍物前方以避免视觉阻碍，可以看情况添加。
至此，我们可以实现摄像机跟随角色移动，并且鼠标能操控摄像机绕着角色转动，但仍有一个问题：当摄像机位于人物前方时，人物前进方向仍是我们的后方，这是由于参考坐标系的缘故，具体修复如下：
1. 在PlayerController脚本中，添加
public Transform cameraTargetPoint;
在Move方法中添加【moveingVec = cameraTargetPoint.TransformDirection(moveingVec);】：
private void Move()
{
float horizontalInput = Input.GetAxis("Horizontal");
float verticalInput = Input.GetAxis("Vertical");
Vector3 moveingVec = new Vector3(horizontalInput, 0f, verticalInput) * Time.deltaTime * speed;
moveingVec = cameraTargetPoint.TransformDirection(moveingVec);
transform.Translate(moveingVec);
}
2. 在CameraController脚本中的cameraMoving()方法中添加下句：文章来源：https://www.toymoban.com/news/detail-835167.html
playerController.cameraTargetPoint = horizontalObj;
于是即可实现摄像头跟随鼠标，并围绕角色运动，并且角色运动方向【仅仅是方向，如果要人物转向，则还需其他修改，本系列其他章节会有涉及】可以自适应为当前摄像头的前方文章来源地址https://www.toymoban.com/news/detail-835167.html
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