first commit

Assets/Scripts/ScaleSurface.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class ScaleSurface : MonoBehaviour
+{
+    [SerializeField] private Transform[] _slots;
+
+    private Transform[] _slotOccupied;
+
+    private void Awake()
+    {
+        _slotOccupied = new Transform[_slots.Length];
+    }
+
+    public void PlaceObject(Transform obj)
+    {
+        obj.SetParent(null);
+
+        for (int i = 0; i < _slotOccupied.Length; i++)
+            if (_slotOccupied[i] == obj)
+                _slotOccupied[i] = null;
+
+        for (int i = 0; i < _slots.Length; i++)
+        {
+            if (_slotOccupied[i] == null)
+            {
+                _slotOccupied[i] = obj;
+
+                Collider col = _slots[i].GetComponent<Collider>();
+                Vector3 targetPos = col != null ? col.bounds.center : _slots[i].position;
+
+                obj.position = targetPos;
+                obj.rotation = _slots[i].rotation;
+
+                MassController mc = GetComponentInParent<MassController>();
+                if (mc == null) mc = FindObjectOfType<MassController>();
+                if (mc != null)
+                    mc.AddObject(obj.GetComponent<Rigidbody>());
+
+                return;
+            }
+        }
+
+        obj.SetParent(null, true);
+    }
+
+    public void RemoveObject(Transform obj)
+    {
+        for (int i = 0; i < _slotOccupied.Length; i++)
+            if (_slotOccupied[i] == obj)
+                _slotOccupied[i] = null;
+    }
+}