Improved the culling result of HizCulling;

Added custom inspector for VolumeObject;
Change the name of AoVolume to VolumeObject;

Editor/PropertyDrawer/PopupBooleanDrawer.cs

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+using System.Collections.Generic;
+using UnityEditor;
+using UnityEngine;
+using UnityEngine.UIElements;
+
+namespace Misaki.AoVolume.Editor
+{
+    [CustomPropertyDrawer(typeof(PopupBooleanAttribute))]
+    public class PopupBooleanDrawer : PropertyDrawer
+    {
+        private static readonly GUIContent[] _popupContent = { new("False"), new("True") };
+        private static readonly List<bool> _popupOptions = new() { false, true };
+
+        public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
+        {
+            var value = property.boolValue;
+            var index = value ? 1 : 0;
+
+            EditorGUI.BeginChangeCheck();
+            index = EditorGUI.Popup(position, label, index, _popupContent);
+            if (EditorGUI.EndChangeCheck())
+            {
+                property.boolValue = index == 1;
+            }
+        }
+
+        public override VisualElement CreatePropertyGUI(SerializedProperty property)
+        {
+            var popupField = new PopupField<bool>(property.displayName, _popupOptions, false);
+            popupField.AddToClassList(PopupField<bool>.alignedFieldUssClassName);
+            popupField.bindingPath = property.propertyPath;
+
+            return popupField;
+        }
+    }
+}

Editor/PropertyDrawer/PopupBooleanDrawer.cs.meta

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+fileFormatVersion: 2
+guid: 60948f0da82ab5849b3df0b869031b01