Basic camera zoom + multiple background segments

Assets/Prefabs.meta

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Assets/Prefabs/Forest.meta

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Assets/Prefabs/Forest/BackgroundSegment.prefab.meta

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Assets/Scripts.meta

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Assets/Scripts/BaseCameraController.cs

+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class BaseCameraController : MonoBehaviour
+{
+
+    [Header("Zoom")]
+    [SerializeField] float maxZoom = 5f;
+    [SerializeField] float minZoom = 1.5f;
+    [SerializeField] float zoomStepSize = 1f;
+    [SerializeField] float zoomDuration = 0.1f;
+
+    Interpolator zoomInterpolator;
+
+    new Camera camera;
+    new AudioSource audio;
+
+    void Awake()
+    {
+        camera = GetComponent<Camera>();
+        audio = GetComponent<AudioSource>();
+        zoomInterpolator = new Interpolator(zoomDuration, camera.orthographicSize, camera.orthographicSize, minZoom, maxZoom);
+    }
+
+    void Update()
+    {
+        var inputZoomDelta = Input.mouseScrollDelta.y * -zoomStepSize;
+        if (inputZoomDelta != 0)
+        {
+            zoomInterpolator.targetValue += inputZoomDelta;
+        }
+        camera.orthographicSize = zoomInterpolator.GetCurrentValue();
+    }
+
+    public void PlayGlobalAudioClip(AudioClip clip, float volume = 1f)
+    {
+        audio.PlayOneShot(clip, volume);
+    }
+}

Assets/Scripts/BaseCameraController.cs.meta

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Assets/Scripts/Interpolator.cs

+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class Interpolator
+{
+
+    public float targetValue
+    {
+        get => _targetValue;
+        set
+        {
+            _targetValue = Mathf.Clamp(value, minValue, maxValue);
+            running = true;
+        }
+    }
+
+    private float duration;
+    private float minValue;
+    private float maxValue;
+    private float currentValue;
+    private float _targetValue;
+    private float velocity;
+    private bool running = true;
+
+    public Interpolator(float duration) : this(duration, 0)
+    {
+    }
+
+    public Interpolator(float duration, float startValue) : this(duration, startValue, startValue)
+    {
+    }
+
+    public Interpolator(float duration, float startValue, float targetValue) : this(duration, startValue, targetValue, float.NegativeInfinity, float.PositiveInfinity)
+    {
+    }
+
+    public Interpolator(float duration, float startValue, float targetValue, float minValue, float maxValue)
+    {
+        this.duration = duration;
+        this.minValue = minValue;
+        this.maxValue = maxValue;
+        currentValue = startValue;
+        _targetValue = targetValue;
+        if (Mathf.Approximately(startValue, targetValue))
+        {
+            running = false;
+        }
+    }
+
+    public float GetCurrentValue()
+    {
+        if (running)
+        {
+            currentValue = Mathf.SmoothDamp(currentValue, _targetValue, ref velocity, duration);
+            if (Mathf.Abs(velocity) < 0.001f)
+            {
+                running = false;
+                currentValue = targetValue;
+            }
+        }
+        return currentValue;
+    }
+
+}

Assets/Scripts/Interpolator.cs.meta

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ProjectSettings/TagManager.asset

@@ -41,3 +41,9 @@ TagManager:
   - name: Default
     uniqueID: 0
     locked: 0
+  - name: Player
+    uniqueID: 3566149241
+    locked: 0
+  - name: OccludesPlayer
+    uniqueID: 2463568037
+    locked: 0