HoHCI-BikeSim/Assets/Wheels/Scripts/FreeCamera.cs

using UnityEngine;

public class FreeCamera : MonoBehaviour
{
    private Vector3 MousePos;
    [SerializeField] private float MoveAccelerationSpeed;
    [SerializeField] private float MoveSpeed;

    [SerializeField] private float RotateSpeed;

    private Vector3 Velocity;

    private void Update()
    {
        Velocity.z = Mathf.MoveTowards(Velocity.z, Input.GetAxis("Vertical") * MoveSpeed,
            MoveAccelerationSpeed * Time.deltaTime);
        Velocity.x = Mathf.MoveTowards(Velocity.x, Input.GetAxis("Horizontal") * MoveSpeed,
            MoveAccelerationSpeed * Time.deltaTime);
        Velocity.y = Mathf.MoveTowards(Velocity.y,
            (Input.GetKey(KeyCode.E) ? 1 : Input.GetKey(KeyCode.Q) ? -1 : 0) * MoveSpeed * 0.3f,
            MoveAccelerationSpeed * Time.deltaTime);

        transform.position += transform.TransformDirection(Velocity);

        var mousePosDelta = Input.mousePosition - MousePos;
        MousePos = Input.mousePosition;

        transform.rotation *= Quaternion.AngleAxis(Input.GetAxis("Mouse Y") * RotateSpeed, Vector3.left);
        transform.rotation *= Quaternion.AngleAxis(Input.GetAxis("Mouse X") * RotateSpeed, Vector3.up);

        var eulerAngles = transform.eulerAngles;
        eulerAngles.z = 0;
        transform.eulerAngles = eulerAngles;

        if (Input.GetKey(KeyCode.LeftAlt))
        {
            Cursor.visible = true;
            Cursor.lockState = CursorLockMode.None;
        }
        else
        {
            Cursor.visible = false;
            Cursor.lockState = CursorLockMode.Locked;
        }

        Camera.main.fieldOfView = Mathf.Clamp(Camera.main.fieldOfView + Input.mouseScrollDelta.y, 5, 150);
    }
}