How to make RTS camera control on smartphones?

Question

Unity

Hello Habr, I need your best minds!

What is the problem. I'm a beginner and I'm doing RTS camera control in 3D space for my phone and I'm not able to zoom the camera. As soon as I touch the screen with 2 fingers, the camera just moves forward without stopping.

The camera itself is attached to the rig and is its child object, as in this picture:


You can see the camera script below:

[SerializeField] private Camera _mainCamera;
    [SerializeField] private float speedCam;
    [SerializeField] private float speedZoom;

    private Vector3 newPosition;
    private Vector3 dragStartPosition;
    private Vector3 dragCurrentPosition;


    private Vector3 newZoom;
    [SerializeField] private Vector3 zoomAmount;

    private void Awake()
    {
        _mainCamera = GetComponentInChildren<Camera>();
        newPosition = transform.position;
    }

    private void Start()
    {

    }
    private void Update()
    {
        HandleTouchInput();
    }
    private void HandleTouchInput() // метод передвижение и зумм - сенсор
    {
        foreach (Touch touch in Input.touches)
        {
            if (Input.touchCount == 1)
            {
                if (touch.phase == TouchPhase.Began) // касается ли палец экрана и создаем плейн, куда отправляем луч
                {
                    Plane plane = new Plane(Vector3.up, Vector3.zero);
                    Ray ray = Camera.main.ScreenPointToRay(Input.GetTouch(0).position);
                    float entry;
                    if (plane.Raycast(ray, out entry)) // если луч касаеться плейна, присваеваем его позицию
                    {
                        dragStartPosition = ray.GetPoint(entry);
                    }
                }
                if (touch.phase == TouchPhase.Moved) // проверяем двигается ли палец и отправляем луч
                {
                    Plane plane = new Plane(Vector3.up, Vector3.zero);
                    Ray ray = Camera.main.ScreenPointToRay(Input.GetTouch(0).position);
                    float entry;
                    if (plane.Raycast(ray, out entry)) // если луч касаеться олейна передаем значения новой позиции
                    {
                        dragCurrentPosition = ray.GetPoint(entry);
                        newPosition = transform.position + dragStartPosition - dragCurrentPosition;
                    }
                }
            }
            if (Input.touchCount == 2) // метод для зумма
            {
                var Finger1 = Input.GetTouch(0);
                var Finger2 = Input.GetTouch(1);

                var TouchFinger0Direction = Finger1.position - Finger1.deltaPosition;
                var TouchFinger1Direction = Finger2.position - Finger2.deltaPosition;

                var TouchesPosition = Vector3.Distance(Finger1.position, Finger2.position);
                var TouchesDirection = Vector3.Distance(TouchFinger0Direction, TouchFinger1Direction);


                if (TouchesPosition > TouchesDirection)
                {
                    newZoom -= zoomAmount;
                }
                if (TouchesPosition < TouchesDirection)
                {
                    newZoom += zoomAmount;
                }
             // как движется зумм 
            _mainCamera.gameObject.transform.localPosition = Vector3.MoveTowards(_mainCamera.gameObject.transform.localPosition, newZoom, Time.deltaTime * speedZoom);
            }
        }

        newPosition.x = Mathf.Clamp(newPosition.x, 16f, 145f);  // ограничеваем передвижение
        newPosition.z = Mathf.Clamp(newPosition.z, -8.5f, 390f);
        transform.position = Vector3.MoveTowards(transform.position, newPosition, Time.deltaTime * speedCam); // плавное передвижение
        
    }

I'm asking:

• Help me zoom in on the camera!

• How can I limit the zoom?

Important:
• The camera is in Perspective mode, which means that you cannot zoom through the viewing angle!

Answer 1

1) Make such a construction from gameobjects
-NodeMove
--NodeZoom
---NodeRotate
----Camera
Then make three scripts, each of which controls only its own gameobject, i.e. NodeZoom can only control the Z coordinate. And NodeRotate rotates along Z. Thus, you will never get a situation when the X or Y coordinate on this object starts to change when you zoom. Of course, NodeMove only X and Y.
2) Next, in each script, do a check. For example, for zoom, you can ignore all situations when touch != 2, and for movement != 1.

Answer 2

When approaching, you need to limit through Mathf.clamp the upper and lower limits of the camera's distance from the camera, I would advise you 200/800