first commit

Assets/Scripts/ScaleZone.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class ScaleZone : MonoBehaviour
+{
+    private List<Rigidbody> _objects = new List<Rigidbody>();
+
+    private void OnTriggerEnter(Collider other)
+    {
+        Rigidbody rb = other.GetComponentInParent<Rigidbody>();
+        if (rb == null) return;
+
+        if (!rb.CompareTag("Target")) return;
+
+        if (!_objects.Contains(rb))
+            _objects.Add(rb);
+    }
+
+    private void OnTriggerExit(Collider other)
+    {
+        Rigidbody rb = other.GetComponentInParent<Rigidbody>();
+        if (rb == null) return;
+
+        _objects.Remove(rb);
+    }
+
+    public float TotalWeight
+    {
+        get
+        {
+            float total = 0f;
+
+            foreach (var rb in _objects)
+            {
+                if (rb != null)
+                    total += rb.mass;
+            }
+
+            return total;
+        }
+    }
+}