first commit

Assets/Scripts/MassController.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using TMPro;
+
+public class MassController : MonoBehaviour
+{
+    [SerializeField] private TextMeshProUGUI _weightText;
+    [SerializeField] private float _animationSpeed = 2f;
+
+    private List<Rigidbody> _bodies = new List<Rigidbody>();
+    private Coroutine _weightRoutine;
+    private float _currentDisplayedValue = 0f;
+
+    private enum UnitMode { Kg, G, Mg }
+    private UnitMode _currentMode = UnitMode.Kg;
+
+    private void Reset()
+    {
+        Collider c = GetComponent<Collider>();
+        if (c != null) c.isTrigger = true;
+    }
+
+    private void Update()
+    {
+        if (_bodies.Count > 0) UpdateWeight();
+    }
+
+    public void AddObject(Rigidbody rb)
+    {
+        if (rb == null) return;
+        if (!_bodies.Contains(rb))
+            _bodies.Add(rb);
+    }
+
+    public void RemoveObject(Rigidbody rb)
+    {
+        if (rb == null) return;
+        _bodies.Remove(rb);
+        UpdateWeight();
+    }
+
+    public void SwitchUnit()
+    {
+        _currentMode = _currentMode switch
+        {
+            UnitMode.Kg => UnitMode.G,
+            UnitMode.G => UnitMode.Mg,
+            _ => UnitMode.Kg
+        };
+        UpdateWeight();
+    }
+
+    private void UpdateWeight()
+    {
+        float totalKg = 0f;
+        foreach (var rb in _bodies)
+        {
+            if (rb == null) continue;
+            LiquidContainer lc = rb.GetComponent<LiquidContainer>()
+                ?? rb.GetComponentInChildren<LiquidContainer>();
+            totalKg += lc != null ? lc.GetTotalMassKg() : rb.mass;
+        }
+        float target = ConvertValue(totalKg);
+        if (_weightRoutine != null) StopCoroutine(_weightRoutine);
+        _weightRoutine = StartCoroutine(AnimateWeight(target));
+    }
+
+    private float ConvertValue(float kg)
+    {
+        return _currentMode switch
+        {
+            UnitMode.G => kg * 1000f,
+            UnitMode.Mg => kg * 1_000_000f,
+            _ => kg
+        };
+    }
+
+    private string GetUnitLabel()
+    {
+        return _currentMode switch
+        {
+            UnitMode.G => " g",
+            UnitMode.Mg => " mg",
+            _ => " kg"
+        };
+    }
+
+    private IEnumerator AnimateWeight(float targetValue)
+    {
+        float elapsed = 0f;
+        float startValue = _currentDisplayedValue;
+        float duration = 1f / _animationSpeed;
+        while (elapsed < duration)
+        {
+            elapsed += Time.deltaTime;
+            _currentDisplayedValue = Mathf.Lerp(startValue, targetValue, elapsed / duration);
+            _weightText.text = _currentDisplayedValue.ToString("F2") + GetUnitLabel();
+            yield return null;
+        }
+        _currentDisplayedValue = targetValue;
+        _weightText.text = targetValue.ToString("F2") + GetUnitLabel();
+    }
+}