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Assets/Scripts/CameraController.cs

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+using System.Collections;
+using UnityEngine;
+using UnityEngine.InputSystem;
+
+public class CameraController : MonoBehaviour
+{
+    [SerializeField]
+    private Camera _cam;
+    
+    [SerializeField]
+    private InputAction pressed, axis, scroll;
+    
+    private float speed = 1f;
+    private Vector2 rotation;
+    private float scrollVal;
+    private bool canRotate;
+    
+    // Start is called before the first frame update
+    void Awake()
+    {
+        pressed.Enable();
+        axis.Enable();
+        scroll.Enable();
+
+        pressed.performed += _ => { StartCoroutine(Rotate()); };
+        pressed.canceled += _ => { canRotate = false; };
+
+        axis.performed += context => { rotation = context.ReadValue<Vector2>(); };
+        axis.canceled += _ => { rotation = Vector3.zero; };
+        
+        scroll.performed += context =>
+        {
+            scrollVal = context.ReadValue<float>(); 
+            ZoomIn();
+        };
+    }
+
+    private void ZoomIn()
+    {
+        RaycastHit hit;
+        if(scrollVal < 0 && Physics.Raycast(_cam.transform.position, transform.forward, out hit, 4))
+            return;
+        if(scrollVal < 0 || Vector3.Distance(_cam.transform.position, transform.position) < 20)
+            _cam.transform.position += -scrollVal * transform.forward;
+    }
+
+    private IEnumerator Rotate()
+    {
+        canRotate = true;
+        while (canRotate)
+        {
+            rotation *= speed;
+            transform.Rotate(Vector3.up, rotation.x);
+            transform.Rotate(transform.right, -rotation.y, Space.World);
+            yield return null;
+        }
+    }
+}

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Assets/Scripts/Demo.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.InputSystem.HID;
+using UnityEngine.UI;
+
+public class Demo : MonoBehaviour
+{
+    [SerializeField]
+    private ObjectQ _queue;
+
+    [SerializeField] private Button previousBtn;
+    [SerializeField] private Button nextBtn;
+    
+    void Awake()
+    {
+        GameObject cube = GameObject.CreatePrimitive(PrimitiveType.Cube);
+        GameObject sphere = GameObject.CreatePrimitive(PrimitiveType.Sphere);
+        GameObject capsule = GameObject.CreatePrimitive(PrimitiveType.Capsule);
+        GameObject cylinder = GameObject.CreatePrimitive(PrimitiveType.Cylinder);
+        GameObject plane = GameObject.CreatePrimitive(PrimitiveType.Quad);
+        
+        _queue.Add(cube);
+        _queue.Add(sphere);
+        _queue.Add(capsule);
+        _queue.Add(cylinder);
+        _queue.Add(plane);
+
+        previousBtn.onClick.AddListener(() => _queue.Change(true));
+        nextBtn.onClick.AddListener(() => _queue.Change(false));
+    }
+    
+}

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Assets/Scripts/ObjectQ.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.SceneManagement;
+
+//Handle Objects in Queue
+public class ObjectQ : MonoBehaviour
+{
+    //all objects in the Q(ueue) are stored here
+    [SerializeField]
+    private List<QableObject> queue = new List<QableObject>();
+    [SerializeField]
+    private Material material;
+
+    private QableObject currentObject = null;
+    private int currentIndex = 0;
+    private State currentState = State.Changing;
+    
+
+    //switch to next or previous object in Q
+    public void Change(bool previous = false)
+    {
+        if(queue.Count < 2 || currentState != State.ViewMode)
+            return;
+
+        currentIndex = previous ? currentIndex - 1 : currentIndex + 1;
+        currentIndex = (currentIndex + queue.Count) % queue.Count;
+        StartCoroutine(ShowNext());
+        currentState = State.Changing;
+    }
+
+    //add Object to Q
+    public void Add(GameObject gameObject)
+    {
+        var o = gameObject.AddComponent<QableObject>();
+        gameObject.transform.SetParent(transform);
+        gameObject.transform.position = transform.position;
+        o.renderer.material = material;
+
+        queue.Add(o);
+        
+        //if no object is currently visible then show the first object in Q
+        if(currentObject == null)
+            StartCoroutine(ShowNext());
+    }
+
+    //Show next object from currentIndex
+    private IEnumerator ShowNext()
+    {
+        if(currentObject != null)
+            yield return StartCoroutine(currentObject.Dissolve());
+        
+        currentObject = queue[currentIndex];
+        StartCoroutine(currentObject.Dissolve(true));
+        currentState = State.ViewMode;
+    }
+
+    
+    //States of ObjectQ
+    public enum State
+    {
+        ViewMode,
+        Changing
+    }
+    
+}
+
+

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Assets/Scripts/QableObject.cs

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+using System;
+using System.Collections;
+using UnityEngine;
+using UnityEngine.PlayerLoop;
+
+//Q(ueue)able Object used by the ObjectQ handler.
+public class QableObject : MonoBehaviour
+{
+   public float _dissolveTime = 0.5f;
+   public Renderer renderer;
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+         timer += Time.deltaTime;
+         yield return new WaitForEndOfFrame();
+      }
+      
+
+      yield return timer;
+   }
+}

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