The camera is moved by the keyboard, and the mouse rotates the viewing angle

The camera moves back and forth, left and right, up and down through the keyboard, and the mouse controls the rotation angle of view

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directly on the code

using UnityEngine;
public class TourCamera : MonoBehaviour
{
    
    
    // 在场景中游览的相机（不要给相机加碰撞器！）
    public Transform tourCamera;
    #region 相机移动参数
    public float moveSpeed = 1.0f;
    public float rotateSpeed = 90.0f;
    public float shiftRate = 2.0f;// 按住Shift加速
    public float minDistance = 0.5f;// 相机离不可穿过的表面的最小距离（小于等于0时可穿透任何表面）
    #endregion
    #region 运动速度和其每个方向的速度分量
    private Vector3 direction = Vector3.zero;
    private Vector3 speedForward;
    private Vector3 speedBack;
    private Vector3 speedLeft;
    private Vector3 speedRight;
    private Vector3 speedUp;
    private Vector3 speedDown;
    #endregion
    void Start()
    {
    
    
        if (tourCamera == null) tourCamera = gameObject.transform;
        // 防止相机边缘穿透
        //if (tourCamera.GetComponent<Camera>().nearClipPlane > minDistance / 3)
        //｛
        //    tourCamera.GetComponent<Camera>().nearClipPlane /= 3;
        //}
    }
    void Update()
    {
    
    
        GetDirection();
        // 检测是否离不可穿透表面过近
        RaycastHit hit;
        while (Physics.Raycast(tourCamera.position, direction, out hit, minDistance))
        {
    
    
            // 消去垂直于不可穿透表面的运动速度分量
            float angel = Vector3.Angle(direction, hit.normal);
            float magnitude = Vector3.Magnitude(direction) * Mathf.Cos(Mathf.Deg2Rad * (180 - angel));
            direction += hit.normal * magnitude;
        }
        tourCamera.Translate(direction * moveSpeed * Time.deltaTime, Space.World);
    }
    private void GetDirection()
    {
    
    
        #region 加速移动
        if (Input.GetKeyDown(KeyCode.LeftShift)) moveSpeed *= shiftRate;
        if (Input.GetKeyUp(KeyCode.LeftShift)) moveSpeed /= shiftRate;
        #endregion
        #region 键盘移动
        // 复位
        speedForward = Vector3.zero;
        speedBack = Vector3.zero;
        speedLeft = Vector3.zero;
        speedRight = Vector3.zero;
        speedUp = Vector3.zero;
        speedDown = Vector3.zero;
        // 获取按键输入
        if (Input.GetKey(KeyCode.W)) speedForward = tourCamera.forward;
        if (Input.GetKey(KeyCode.S)) speedBack = -tourCamera.forward;
        if (Input.GetKey(KeyCode.A)) speedLeft = -tourCamera.right;
        if (Input.GetKey(KeyCode.D)) speedRight = tourCamera.right;
        if (Input.GetKey(KeyCode.E)) speedUp = Vector3.up;
        if (Input.GetKey(KeyCode.Q)) speedDown = Vector3.down;
        direction = speedForward + speedBack + speedLeft + speedRight + speedUp + speedDown;
        #endregion
        #region 鼠标旋转
        if (Input.GetMouseButton(1))
        {
    
    
            // 转相机朝向
            tourCamera.RotateAround(tourCamera.position, Vector3.up, Input.GetAxis("Mouse X") * rotateSpeed * Time.deltaTime);
            tourCamera.RotateAround(tourCamera.position, tourCamera.right, -Input.GetAxis("Mouse Y") * rotateSpeed * Time.deltaTime);
            // 转运动速度方向
            direction = V3RotateAround(direction, Vector3.up, Input.GetAxis("Mouse X") * rotateSpeed * Time.deltaTime);
            direction = V3RotateAround(direction, tourCamera.right, -Input.GetAxis("Mouse Y") * rotateSpeed * Time.deltaTime);
        }
        #endregion
    }
    /// <summary>
    /// 计算一个Vector3绕旋转中心旋转指定角度后所得到的向量。
    /// </summary>
    /// <param name="source">旋转前的源Vector3</param>
    /// <param name="axis">旋转轴</param>
    /// <param name="angle">旋转角度</param>
    /// <returns>旋转后得到的新Vector3</returns>
    public Vector3 V3RotateAround(Vector3 source, Vector3 axis, float angle)
    {
    
    
        Quaternion q = Quaternion.AngleAxis(angle, axis);// 旋转系数
        return q * source;// 返回目标点
    }
}

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The original link is: https://gameinstitute.qq.com/community/detail/132946
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