有没有办法在更新旋转时使相机围绕游戏对象运行？答案

【问题标题】：Is there a way to make a the camera orbit around a GameObject while updating rotation?有没有办法在更新旋转时使相机围绕游戏对象运行？
【发布时间】：2019-07-10 01:11:02
【问题描述】：

我一直在尝试在 Unity 5 中编写一辆汽车，它可以像普通汽车一样移动，但摄像头围绕它运行。我有这个工作，但是当汽车转弯时，相机不能保持它的轨道位置。示例：我正在看汽车的后部，然后我右转。我现在要看看汽车的右侧。有什么方法可以让相机相对于汽车保持在相同的位置。

我从本教程中获得了汽车运动，但我不喜欢其中的摄像机运动，我希望摄像机围绕汽车运行。我跟着这个相机移动。但是，我正在尝试对其进行修改，以便相机随车转动并且不会重置到车后部

CameraManager.cs：

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

public class CameraManager : MonoBehaviour
{
    public InputManager im;
    public bool lockCursor;
    public float distance = 5f;
    public float mouseSensitivity = 10f;
    public Transform target;
    public Vector2 pitchMinMax = new Vector2 (-40, 85);
    public float rotationSmoothTime = 0.12f;

    Vector3 rotationSmoothVelocity;
    Vector3 currentRotation;
    float yaw;
    float pitch;

    void Start()
    {
        im = GetComponent<InputManager>();
        if (lockCursor)
        {
            Cursor.lockState = CursorLockMode.Locked;
            Cursor.visible = false;
        }
    }

    // Update is called once per frame
    void LateUpdate()
    {

        yaw += (Input.GetAxis("Mouse X")) * mouseSensitivity;
        pitch -= Input.GetAxis("Mouse Y") * mouseSensitivity;
        pitch = Mathf.Clamp(pitch, pitchMinMax.x, pitchMinMax.y);

        currentRotation = Vector3.SmoothDamp(currentRotation, new Vector3(pitch, yaw), ref rotationSmoothVelocity, rotationSmoothTime);
        transform.eulerAngles = currentRotation;

        print(target.transform.forward);
        transform.position = target.position - transform.forward * distance;

    }
}

InputManager.cs：

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

public class InputManager : MonoBehaviour
{
    public float throttle;
    public float steer;

    // Update is called once per frame
    void Update()
    {
        throttle = Input.GetAxis("Vertical");
        steer = Input.GetAxis("Horizontal");
        print(steer);
    }
}

CarController.cs：

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


[RequireComponent(typeof(InputManager))]
[RequireComponent(typeof(Rigidbody))]
public class CarController : MonoBehaviour
{
    public InputManager im;
    public List<WheelCollider> throttleWheels;
    public List<WheelCollider> steeringWheels;
    public float strengthCo = 10000f; //Strength Coefficent
    public float maxTurn = 20f;
    public Transform CM;
    public Rigidbody rb;

    // Start is called before the first frame update
    void Start()
    {
        im = GetComponent<InputManager>();
        rb = GetComponent<Rigidbody>();

        if (CM)
        {
            rb.centerOfMass = CM.position;
        }
    }

    // Update is called once per frame
    void FixedUpdate()
    {
        foreach (WheelCollider wheel in throttleWheels)
        {
            wheel.motorTorque = strengthCo * Time.deltaTime * im.throttle;
        }
        foreach (WheelCollider wheel in steeringWheels)
        {
            wheel.steerAngle = maxTurn * im.steer;
        }
    }
}

【问题讨论】：

无需在代码中执行此操作。制作一个作为汽车子对象的游戏对象，并将其放置在您希望发生旋转的位置。将相机对准该游戏对象指向汽车，然后将其移到您想要的任意位置。旋转游戏对象。当汽车绕汽车运行时，摄像头将继续指向汽车。

标签： c# unity3d

【解决方案1】：

您可以使用Quaternion.Euler(currentRotation) 作为相对旋转来应用到target.rotation，并使用target.rotation * Quaternion.Euler(currentRotation) 应用它：

void LateUpdate()
{

    yaw += (Input.GetAxis("Mouse X")) * mouseSensitivity;
    pitch -= Input.GetAxis("Mouse Y") * mouseSensitivity;
    pitch = Mathf.Clamp(pitch, pitchMinMax.x, pitchMinMax.y);

    currentRotation = Vector3.SmoothDamp(currentRotation, new Vector3(pitch, yaw), ref rotationSmoothVelocity, rotationSmoothTime);
    transform.rotation = target.rotation * Quaternion.Euler(currentRotation);

    print(target.transform.forward);
    transform.position = target.position - transform.forward * distance;

}

【讨论】：