Initial Upload;

Runtime/Models/VolumeEntity.cs

@@ -0,0 +1,17 @@
+namespace Misaki.AoVolume
+{
+    internal readonly struct VolumeEntity
+    {
+        private const int _INVALID_INDEX = -1;
+
+        public readonly int entityIndex;
+        public readonly bool IsValid => entityIndex != _INVALID_INDEX;
+
+        public static readonly VolumeEntity InvalidEntity = new(_INVALID_INDEX);
+
+        public VolumeEntity(int index)
+        {
+            entityIndex = index;
+        }
+    }
+}

Runtime/Models/VolumeEntity.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: de5e2eab102d42b4fa1e2b7a06810b4d

Runtime/Models/VolumeObject.cs

@@ -0,0 +1,39 @@
+using UnityEngine;
+
+namespace Misaki.AoVolume
+{
+    internal abstract class VolumeObject : MonoBehaviour
+    {
+        private VolumeEntity _entity = VolumeEntity.InvalidEntity;
+
+        public VolumeData data;
+
+        protected virtual void InitializeEntity()
+        {
+            if (_entity.IsValid)
+            {
+                return;
+            }
+
+            _entity = VolumeDatabase.Instance.CreateEntity(this);
+        }
+
+        protected virtual void OnEnable()
+        {
+            InitializeEntity();
+        }
+
+        protected virtual void OnDisable()
+        {
+            if (_entity.IsValid)
+            {
+                VolumeDatabase.Instance.DestroyEntity(_entity);
+            }
+        }
+
+        protected virtual void Update()
+        {
+
+        }
+    }
+}

Runtime/Models/VolumeObject.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 410059065965c744db4523b0dec8a3aa