Unity3d camera, the keyboard controls the front and rear left and right up and down movement, and the mouse controls the rotation, zoom in and out

Unity3D When running scenarios in , Realize the front of the camera 、 after 、 Left 、 Right 、 On 、 Next , And the zoom of the mouse wheel , Rotate the right mouse button . Close test effectively , For reference .
Introduction to key functions ：W—— front ;S—— after ;A—— Left ;D—— Right ;Q—— falling ;E—— rising ; Right mouse button —— rotate ; Mouse wheel —— Shrinkage .
Tourcamera The script needs to be hung on the camera component .
You also need to add “Physics Raycaster” Components .

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

public class Tourcamera : MonoBehaviour
{
    
    public Transform tourCamera;
    #region  Camera movement parameters 
    public float moveSpeed = 1.0f;
    public float rotateSpeed = 90.0f;
    public float shiftRate = 2.0f;//  Hold down Shift Speed up 
    public float minDistance = 0.5f;//  The minimum distance of the camera from an impenetrable surface （ Less than or equal to 0 Can penetrate any surface ）
    #endregion

    #region  The velocity of motion and its velocity component in each direction 
    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;
        //  Prevent camera edges from penetrating 
        //if (tourCamera.GetComponent<Camera>().nearClipPlane > minDistance / 3)
        //{
    
        // tourCamera.GetComponent<Camera>().nearClipPlane /= 3;
        //}
    }
    void Update()
    {
    
        GetDirection();
        //  Check whether it is too close to the impenetrable surface 
        RaycastHit hit;
        while (Physics.Raycast(tourCamera.position, direction, out hit, minDistance))
        {
    
            //  Eliminate the velocity component perpendicular to the impenetrable surface 
            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  Move faster 
        if (Input.GetKeyDown(KeyCode.LeftShift)) moveSpeed *= shiftRate;
        if (Input.GetKeyUp(KeyCode.LeftShift)) moveSpeed /= shiftRate;
        #endregion

        #region  The keyboard moves 
        //  Reset 
        speedForward = Vector3.zero;
        speedBack = Vector3.zero;
        speedLeft = Vector3.zero;
        speedRight = Vector3.zero;
        speedUp = Vector3.zero;
        speedDown = Vector3.zero;
        //  Get key input 
        if (Input.GetKey(KeyCode.UpArrow) || Input.GetKey(KeyCode.W)) speedForward = tourCamera.forward;
        if (Input.GetKey(KeyCode.DownArrow) || Input.GetKey(KeyCode.S)) speedBack = -tourCamera.forward;
        if (Input.GetKey(KeyCode.LeftArrow) || Input.GetKey(KeyCode.A)) speedLeft = -tourCamera.right;
        if (Input.GetKey(KeyCode.RightArrow) || 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  Mouse rotation 
        if (Input.GetMouseButton(1))
        {
    
            //  Turn the camera towards 
            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);
            //  Turn the speed direction 
            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

        #region  Mouse wheel effect 
        if (Input.GetAxis("Mouse ScrollWheel") < 0)
        {
    
            if (Camera.main.fieldOfView <= 100)
                Camera.main.fieldOfView += 2;
            if (Camera.main.orthographicSize <= 20)
                Camera.main.orthographicSize += 0.5F;
        }
        //Zoom in
        if (Input.GetAxis("Mouse ScrollWheel") > 0)
        {
    
            if (Camera.main.fieldOfView > 2)
                Camera.main.fieldOfView -= 2;
            if (Camera.main.orthographicSize >= 1)
                Camera.main.orthographicSize -= 0.5F;
        }
        #endregion
    }

    public Vector3 V3RotateAround(Vector3 source, Vector3 axis, float angle)
    {
    
        Quaternion q = Quaternion.AngleAxis(angle, axis);//  Rotation coefficient 
        return q * source;//  Return to target point 
    }
}