fix: use OnEnable/OnDisable on CameraManager

Assets/Scripts/CameraManager.cs

@@ -11,17 +11,26 @@ public class CameraManager : MonoBehaviour
     private Texture2D photo;
 
     // Start is called before the first frame update
+    void OnEnable()
+    {
+        wTexture = new WebCamTexture(wDevice.name);
+        WebcamResume();
+    }
+
+    void OnDisable()
+    {
+        wTexture = null;
+    }
+
     void Start()
     {
         wDevice = WebCamTexture.devices.FirstOrDefault(x => x.isFrontFacing == false);
-        wTexture = new WebCamTexture(wDevice.name);
-        WebcamResume();
     }
 
     // Update is called once per frame
     void Update()
     {
-        gameObject.GetComponent<RawImage>().texture = photo ? photo : GetPhoto();
+        gameObject.GetComponent<RawImage>().texture = GetPhoto();
         Resources.UnloadUnusedAssets();
     }
 
@@ -103,8 +112,16 @@ Texture2D CropTexture(WebCamTexture originalTexture)
         return croppedTexture;
     }
 
-    Texture2D GetPhoto()
+    public Texture2D GetPhoto()
     {
+        if (photo) {
+            return photo;
+        }
+
+        if (!wTexture) {
+            return null;
+        }
+
         Texture2D cropped = CropTexture(wTexture);
         Texture2D rotated = RotateTexture(cropped, !wDevice.isFrontFacing);
         rotated.Apply();