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+    forceMaximumCompressionQuality_BC6H_BC7: 0
+  spriteSheet:
+    serializedVersion: 2
+    sprites: []
+    outline: []
+    customData: 
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+    bones: []
+    spriteID: 
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+    nameFileIdTable: {}
+  mipmapLimitGroupName: 
+  pSDRemoveMatte: 0
+  userData: 
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+  spriteBorder: {x: 0, y: 0, z: 0, w: 0}
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+  - serializedVersion: 4
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+  spriteSheet:
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+    spriteID: 
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Editor/PrefabPainter/Model.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: c822feadf9228f342af3c4ad28582b64
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Editor/PrefabPainter/Model/AlignmentType.cs

@@ -0,0 +1,9 @@
+namespace Misaki.ArtToolEditor
+{
+    public enum AlignmentType
+    {
+        Surface,
+        Stroke,
+        Object
+    }
+}

Editor/PrefabPainter/Model/AlignmentType.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: f772b54ba4b26684783b464429761c76

Editor/PrefabPainter/Model/BrustSetting.cs

@@ -0,0 +1,15 @@
+namespace Misaki.ArtToolEditor
+{
+    public class BrustSetting
+    {
+        public float BrushSize = 1.0f;
+        public float SplatSpacing = 0.0f;
+        public float Density = 1.0f;
+        //public AnimationCurve DensityFalloff = new() { keys = new Keyframe[2] { new(0, 1, 0, 0f, 0.33f, 0.33f), new(1, 0, -2.71698f, -2.71698f, 0.04166669f, 0.3333333f) } };
+
+        public bool GpuInstancing;
+        public bool Gravity;
+        public int PaintLayer = 1;
+        public bool AvoidOverlap = true;
+    }
+}

Editor/PrefabPainter/Model/BrustSetting.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 86238205cd9e2fa46b2d968712f138a8

Editor/PrefabPainter/Model/PaintType.cs

@@ -0,0 +1,9 @@
+namespace Misaki.ArtToolEditor
+{
+    public enum PaintType
+    {
+        Disable,
+        Paint,
+        Erase
+    }
+}

Editor/PrefabPainter/Model/PaintType.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 62169afb2f6013f459419503b0ff9d54

Editor/PrefabPainter/Model/ParentType.cs

@@ -0,0 +1,9 @@
+namespace Misaki.ArtToolEditor
+{
+    public enum ParentType
+    {
+        None,
+        Target,
+        Custom
+    }
+}

Editor/PrefabPainter/Model/ParentType.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: d1b4396dd01848242910a05acbd0b1f2

Editor/PrefabPainter/Model/RandomnessType.cs

@@ -0,0 +1,13 @@
+using System;
+
+namespace Misaki.ArtToolEditor
+{
+    [Flags]
+    public enum RandomnessType
+    {
+        None = 0,
+        Position = 1 << 0,
+        Rotation = 1 << 1,
+        Scale = 1 << 2
+    }
+}

Editor/PrefabPainter/Model/RandomnessType.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 13f48dca3ecc2a048897b24de62a947f

Editor/PrefabPainter/Model/ReferencePointType.cs

@@ -0,0 +1,8 @@
+namespace Misaki.ArtToolEditor
+{
+    public enum ReferencePointType
+    {
+        Axis,
+        BoundingBox
+    }
+}

Editor/PrefabPainter/Model/ReferencePointType.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 828353399e10eb847aa0dc512523b9b1

Editor/PrefabPainter/Model/SourcePrefab.cs

@@ -0,0 +1,27 @@
+using UnityEngine;
+
+namespace Misaki.ArtToolEditor
+{
+    public class SourcePrefab
+    {
+        public bool Enabled = true;
+        public Texture2D Icon;
+        public GameObject Prefab;
+
+        public float Frequency = 1.0f;
+        public AlignmentType Alignment;
+        public ParentType Parent;
+        public GameObject ParentObject;
+        public float ObjectSpacing = 1.0f;
+        public ReferencePointType ReferencePoint;
+        public float SlopeFilter = 45;
+
+        public RandomnessType Randomness;
+        public Vector3 PositionMin;
+        public Vector3 PositionMax;
+        public Vector3 RotationMin;
+        public Vector3 RotationMax;
+        public Vector3 ScaleMin = Vector3.one;
+        public Vector3 ScaleMax = Vector3.one;
+    }
+}

Editor/PrefabPainter/Model/SourcePrefab.cs.meta

@@ -0,0 +1,2 @@
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+guid: e7f6438ee4d032d469a646aa2f17c1d9

Editor/PrefabPainter/Utilities.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: 983178edcf0295a4f82dd5b00863b302
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Editor/PrefabPainter/Utilities/BoundUtilities.cs

@@ -0,0 +1,88 @@
+using UnityEngine;
+
+namespace Misaki.ArtToolEditor
+{
+    internal class BoundUtilities
+    {
+        internal struct SphereBounds
+        {
+            internal Vector3 position;
+            internal float radius;
+
+            /// <summary>
+            /// Create a sphere bound based on a position and a radius.
+            /// </summary>
+            /// <param name="p">Position</param>
+            /// <param name="r">Radius</param>
+            internal SphereBounds(Vector3 p, float r)
+            {
+                position = p;
+                radius = r;
+            }
+
+            /// <summary>
+            /// Return true if the other sphere is in the radius of this sphere bound.
+            /// </summary>
+            /// <param name="other"></param>
+            /// <returns></returns>
+            internal bool Intersects(SphereBounds other)
+            {
+                return Vector3.Distance(position, other.position) < (radius + other.radius);
+            }
+        }
+
+        /// <summary>
+        /// Create a spherical bounds inside of a Renderer bounds.
+        /// It'll take every meshes found in the hierarchy into account.
+        /// </summary>
+        /// <param name="go">GameObject having Renderer component(s).</param>
+        /// <param name="bounds">Sphere bounds instance in which sphere information will be store.</param>
+        /// <returns>True if bounds data has been set.</returns>
+        internal static bool GetSphereBounds(GameObject go, out SphereBounds bounds)
+        {
+            var entireObjectBounds = GetHierarchyBounds(go);
+
+            bounds = default(SphereBounds);
+
+            if (entireObjectBounds.size == Vector3.zero)
+                return false;
+
+            bounds.position = entireObjectBounds.center;
+            bounds.radius = Mathf.Max(entireObjectBounds.extents.x, entireObjectBounds.extents.z);
+
+            return true;
+        }
+
+        /// <summary>
+        /// Create bounds based on meshes found in the given GameObject hierarchy.
+        /// </summary>
+        /// <param name="parent">Root object.</param>
+        /// <returns>New bounds around the given GameObject.
+        /// If GameObject has no Renderer, bounds will have a size of zero.</returns>
+        internal static Bounds GetHierarchyBounds(GameObject parent)
+        {
+            var renderers = parent.GetComponentsInChildren<Renderer>();
+
+            var bounds = default(Bounds);
+
+            if (renderers.Length == 0)
+                return bounds;
+
+            for (var i = 0; i < renderers.Length; ++i)
+            {
+                var it = renderers[i].bounds;
+
+                if (i == 0)
+                {
+                    // World position
+                    bounds.center = it.center;
+                }
+
+                bounds.Encapsulate(it.max);
+                bounds.Encapsulate(it.min);
+            }
+
+            return bounds;
+        }
+    }
+}

Editor/PrefabPainter/Utilities/BoundUtilities.cs.meta

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+guid: 8b26f9e24f955774aa8129e3cf5e6b4f

Editor/PrefabPainter/View.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: 17aeae943c40d294b834f6b3916ba7d8
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Editor/PrefabPainter/View/PrefabListItemTemplate.uxml

@@ -0,0 +1,26 @@
+<engine:UXML xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:engine="UnityEngine.UIElements" xmlns:editor="UnityEditor.UIElements" noNamespaceSchemaLocation="../../../../../UIElementsSchema/UIElements.xsd" editor-extension-mode="True">
+    <engine:VisualElement name="Root" data-source-type="Misaki.ArtToolEditor.SourcePrefab, Misaki.ArtTool.Editor" style="flex-grow: 1; flex-direction: row; height: 50px;">
+        <engine:Toggle style="margin-right: 8px; margin-top: 3px;">
+            <Bindings>
+                <engine:DataBinding property="value" data-source-path="Enabled" binding-mode="TwoWay" />
+            </Bindings>
+        </engine:Toggle>
+        <engine:VisualElement name="Icon" style="width: 50px;">
+            <Bindings>
+                <engine:DataBinding property="style.backgroundImage" data-source-path="Icon" binding-mode="TwoWay" />
+            </Bindings>
+        </engine:VisualElement>
+        <engine:VisualElement style="flex-grow: 1; margin-top: 2px; margin-right: 2px; margin-bottom: 2px; margin-left: 8px; justify-content: center;">
+            <editor:ObjectField type="UnityEngine.GameObject, UnityEngine.CoreModule">
+                <Bindings>
+                    <engine:DataBinding property="value" data-source-path="Prefab" binding-mode="TwoWay" />
+                </Bindings>
+            </editor:ObjectField>
+            <engine:Slider value="0.5" high-value="1" show-input-field="true">
+                <Bindings>
+                    <engine:DataBinding property="value" data-source-path="Frequency" binding-mode="TwoWay" />
+                </Bindings>
+            </engine:Slider>
+        </engine:VisualElement>
+    </engine:VisualElement>
+</engine:UXML>

Editor/PrefabPainter/View/PrefabListItemTemplate.uxml.meta

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+ScriptedImporter:
+  internalIDToNameTable: []
+  externalObjects: {}
+  serializedVersion: 2
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
+  script: {fileID: 13804, guid: 0000000000000000e000000000000000, type: 0}

Editor/PrefabPainter/View/PrefabPainterWindow.cs

@@ -0,0 +1,166 @@
+using Misaki.ArtToolEditor;
+using System.Linq;
+using UnityEditor;
+using UnityEditor.UIElements;
+using UnityEngine;
+using UnityEngine.UIElements;
+
+public class PrefabPainterWindow : EditorWindow
+{
+    public PrefabPainterWindow()
+    {
+        ViewModel = PrefabPainterViewModel.Instance;
+    }
+
+    public PrefabPainterViewModel ViewModel;
+
+    [SerializeField]
+    private VisualTreeAsset visualTreeAsset = default;
+
+    [SerializeField]
+    private VisualTreeAsset listViewItemTemplate = default;
+
+    [MenuItem("Tools/Prefab Painter")]
+    public static void ShowExample()
+    {
+        var wnd = GetWindow<PrefabPainterWindow>();
+        var icon = EditorGUIUtility.IconContent("Prefab Icon");
+        wnd.titleContent = new GUIContent("Prefab Painter", icon.image);
+    }
+
+    public void CreateGUI()
+    {
+        var root = rootVisualElement;
+
+        VisualElement visualAsset = visualTreeAsset.Instantiate();
+
+        var visualAssetRoot = visualAsset.Q<VisualElement>("Root");
+        visualAssetRoot.dataSource = this;
+
+        SetupModeButton(visualAsset);
+        SetupListView(visualAsset);
+
+        root.Add(visualAsset);
+    }
+
+    private void OnEnable()
+    {
+        SceneView.duringSceneGui += OnSceneGUI;
+        ViewModel.OnNavigatedTo();
+    }
+
+    private void OnDisable()
+    {
+        SceneView.duringSceneGui -= OnSceneGUI;
+    }
+
+    private void OnSceneGUI(SceneView sceneView)
+    {
+        ViewModel.DrawBrush();
+    }
+
+    private void SetupModeButton(VisualElement visualAsset)
+    {
+        var disableModeButton = visualAsset.Q<Button>("Disable-Mode-Button");
+        var paintModeButton = visualAsset.Q<Button>("Paint-Mode-Button");
+        var eraseModeButton = visualAsset.Q<Button>("Erase-Mode-Button");
+
+        disableModeButton.clicked += () =>
+        {
+            disableModeButton.AddToClassList("Selected");
+            paintModeButton.RemoveFromClassList("Selected");
+            eraseModeButton.RemoveFromClassList("Selected");
+
+            ViewModel.CurrentPaintType = PaintType.Disable;
+        };
+
+        paintModeButton.clicked += () =>
+        {
+            paintModeButton.AddToClassList("Selected");
+            disableModeButton.RemoveFromClassList("Selected");
+            eraseModeButton.RemoveFromClassList("Selected");
+
+            ViewModel.CurrentPaintType = PaintType.Paint;
+        };
+
+        eraseModeButton.clicked += () =>
+        {
+            eraseModeButton.AddToClassList("Selected");
+            disableModeButton.RemoveFromClassList("Selected");
+            paintModeButton.RemoveFromClassList("Selected");
+
+            ViewModel.CurrentPaintType = PaintType.Erase;
+        };
+    }
+
+    private void SetupListView(VisualElement visualAsset)
+    {
+        var listView = visualAsset.Q<ListView>("SourcePrefabs-ListView");
+        var PrefabSettingSection = visualAsset.Q<VisualElement>("Prefab-Setting");
+        PrefabSettingSection.style.display = DisplayStyle.None;
+
+        listView.makeItem = () => listViewItemTemplate.CloneTree();
+
+        listView.selectionChanged += objects =>
+        {
+            if (objects.Count() <= 0)
+            {
+                return;
+            }
+
+            if (objects.First() is not SourcePrefab sourcePrefab)
+            {
+                return;
+            }
+
+            ViewModel.CurrentSelection = sourcePrefab;
+            PrefabSettingSection.style.display = DisplayStyle.Flex;
+        };
+
+        listView.bindItem = (element, i) =>
+        {
+            var objectField = element.Q<ObjectField>();
+            objectField.RegisterValueChangedCallback((evt) =>
+            {
+                if (evt.newValue == null)
+                {
+                    return;
+                }
+
+                var icon = AssetPreview.GetAssetPreview(evt.newValue);
+                while (icon == null)
+                {
+                    icon = AssetPreview.GetAssetPreview(evt.newValue);
+                }
+                ViewModel.SourcePrefabs[i].Icon = icon;
+            });
+        };
+
+        listView.itemsAdded += (items) =>
+        {
+            for (var i = 0; i < items.Count(); i++)
+            {
+                var index = listView.itemsSource.Count - i - 1;
+                ViewModel.SourcePrefabs[index] = new SourcePrefab();
+            }
+
+            listView.Rebuild();
+        };
+
+        listView.itemsRemoved += (items) =>
+        {
+            if (ViewModel.SourcePrefabs.Count - items.Count() <= 0)
+            {
+                PrefabSettingSection.style.display = DisplayStyle.None;
+                return;
+            }
+
+            listView.Rebuild();
+        };
+
+        listView.itemIndexChanged += (from, to) =>
+        {
+            listView.Rebuild();
+        };
+    }
+}

Editor/PrefabPainter/View/PrefabPainterWindow.cs.meta

@@ -0,0 +1,16 @@
+fileFormatVersion: 2
+guid: 09eefec055820c24785d451ce8c3c2eb
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences:
+  - m_ViewDataDictionary: {instanceID: 0}
+  - visualTreeAsset: {fileID: 9197481963319205126, guid: a4196f221910b5442bc80d8305ee937e,
+      type: 3}
+  - listViewItemTemplate: {fileID: 9197481963319205126, guid: 05d16995f16706d48957fd51a6f23988,
+      type: 3}
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Editor/PrefabPainter/View/PrefabPainterWindow.uss

@@ -0,0 +1,45 @@
+.Header {
+    -unity-font-style: bold;
+    margin-top: 16px;
+    margin-bottom: 12px;
+    font-size: 14px;
+}
+
+.SubHeader {
+    margin-bottom: 6px;
+    -unity-font-style: bold;
+    font-size: 12px;
+    margin-top: 8px;
+}
+
+.SmallHeader {
+    margin-top: 6px;
+    margin-bottom: 4px;
+}
+
+.PropertyContainer {
+    flex-grow: 1;
+    margin-left: 8px;
+}
+
+#Root > .unity-tab-view > #unity-tab-view__header-container {
+    align-self: center;
+}
+
+#unity-tab__content-container {
+    padding-top: 16px;
+    padding-right: 5px;
+    padding-bottom: 5px;
+    padding-left: 5px;
+}
+
+.Selected {
+    border-top-width: 1px;
+    border-right-width: 1px;
+    border-bottom-width: 1px;
+    border-left-width: 1px;
+    border-left-color: rgb(186, 186, 186);
+    border-right-color: rgb(186, 186, 186);
+    border-top-color: rgb(186, 186, 186);
+    border-bottom-color: rgb(186, 186, 186);
+}

Editor/PrefabPainter/View/PrefabPainterWindow.uss.meta

@@ -0,0 +1,11 @@
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Editor/PrefabPainter/View/PrefabPainterWindow.uxml

@@ -0,0 +1,181 @@
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+    <Style src="project://database/Packages/com.misaki.art-tools/Editor/PrefabPainter/View/PrefabPainterWindow.uss?fileID=7433441132597879392&amp;guid=1d93d96e22cd7f1429707b56e9402af2&amp;type=3#PrefabPainterWindow" />
+    <engine:VisualElement name="Root" data-source-type="PrefabPainterWindow, Misaki.ArtTool.Editor" style="flex-grow: 1; padding-top: 5px; padding-right: 5px; padding-bottom: 5px; padding-left: 5px;">
+        <engine:VisualElement name="Title" style="flex-grow: 0;">
+            <engine:Label text="Prefab Painter" style="align-self: center; font-size: 28px; margin-top: 32px; margin-bottom: 24px;" />
+        </engine:VisualElement>
+        <engine:VisualElement name="Toolbar" style="flex-grow: 0; flex-direction: row; justify-content: center; margin-bottom: 16px;">
+            <engine:Button icon-image="project://database/Packages/com.misaki.art-tools/Editor/PrefabPainter/Icon/unavailable.png?fileID=2800000&amp;guid=89f753d5e2b91c842a8de6447e3fe8b3&amp;type=3#unavailable" name="Disable-Mode-Button" tooltip="Paint" class="Selected" style="width: 30px; height: 30px;" />
+            <engine:Button icon-image="project://database/Packages/com.misaki.art-tools/Editor/PrefabPainter/Icon/Paint.png?fileID=2800000&amp;guid=a36d0148cfebe8c428c95a88eae0819a&amp;type=3#Paint" name="Paint-Mode-Button" tooltip="Paint" style="width: 30px; height: 30px;" />
+            <engine:Button icon-image="project://database/Packages/com.misaki.art-tools/Editor/PrefabPainter/Icon/erase.png?fileID=2800000&amp;guid=937646d041ffb2c4c8b4139900477869&amp;type=3#erase" name="Erase-Mode-Button" tooltip="Erase" style="width: 30px; height: 30px;" />
+        </engine:VisualElement>
+        <engine:TabView style="flex-grow: 1;">
+            <engine:Tab label="Prefab" name="Prefab-Tab" icon-image="project://database/Packages/com.misaki.art-tools/Editor/PrefabPainter/Icon/object.png?fileID=2800000&amp;guid=a61bfbad022af42448490799093b2d97&amp;type=3#object" style="flex-grow: 1;">
+                <engine:VisualElement name="Prefab-List" style="padding-top: 0; padding-right: 0; padding-bottom: 0; padding-left: 0;">
+                    <editor:Toolbar style="margin-top: 0; margin-right: 0; margin-bottom: 8px; margin-left: 0;">
+                        <editor:ToolbarButton icon-image="project://database/Packages/com.misaki.art-tools/Editor/PrefabPainter/Icon/import.png?fileID=2800000&amp;guid=bc1c9a2da21fe83448b139a8a35aa32e&amp;type=3#import" tooltip="Import prefab list" style="width: 30px; padding-top: 2px; padding-right: 2px; padding-bottom: 2px; padding-left: 2px;" />
+                        <editor:ToolbarButton icon-image="project://database/Packages/com.misaki.art-tools/Editor/PrefabPainter/Icon/export.png?fileID=2800000&amp;guid=c87abe98330a0ef46b5bbf5b784e8bc3&amp;type=3#export" tooltip="Export prefab list" style="padding-top: 2px; padding-right: 2px; padding-bottom: 2px; padding-left: 2px; width: 30px;" />
+                        <editor:ToolbarSpacer style="flex-grow: 1;" />
+                        <editor:ToolbarSearchField style="width: 50%;" />
+                    </editor:Toolbar>
+                    <engine:ListView reorderable="true" reorder-mode="Animated" show-border="true" fixed-item-height="50" item-template="project://database/Packages/com.misaki.art-tools/Editor/PrefabPainter/View/PrefabListItemTemplate.uxml?fileID=9197481963319205126&amp;guid=05d16995f16706d48957fd51a6f23988&amp;type=3#PrefabListItemTemplate" name="SourcePrefabs-ListView" data-source-path="ViewModel" show-add-remove-footer="true" binding-source-selection-mode="AutoAssign" virtualization-method="DynamicHeight" style="max-height: 1000px;">
+                        <Bindings>
+                            <engine:DataBinding property="itemsSource" data-source-path="SourcePrefabs" binding-mode="TwoWay" />
+                        </Bindings>
+                    </engine:ListView>
+                    <engine:VisualElement name="List-Setting" class="SettingContainer PropertyContainer">
+                        <engine:Label text="List setting" name="List-Setting-Header" class="SubHeader" />
+                        <engine:VisualElement name="Scatter-Properties" class="PropertyContainer" style="flex-grow: 1;">
+                            <engine:DropdownField label="Random Order" choices="Disable,Enable" index="1" data-source-path="ViewModel">
+                                <Bindings>
+                                    <engine:DataBinding property="index" data-source-path="RandomOrder" binding-mode="TwoWay" />
+                                </Bindings>
+                            </engine:DropdownField>
+                        </engine:VisualElement>
+                    </engine:VisualElement>
+                </engine:VisualElement>
+                <engine:VisualElement name="Prefab-Setting" data-source-path="ViewModel" style="flex-grow: 1;">
+                    <engine:Label text="Prefab setting" class="Header" />
+                    <engine:VisualElement class="PropertyContainer">
+                        <engine:VisualElement name="Scatter-Setting" class="SettingContainer">
+                            <engine:Label text="Scatter setting" name="Scatter-Header" class="SubHeader" />
+                            <engine:VisualElement name="Scatter-Properties" class="PropertyContainer" style="flex-grow: 1;">
+                                <engine:EnumField label="Align To" type="Misaki.ArtToolEditor.AlignmentType, Misaki.ArtTool.Editor" data-source-path="CurrentSelection">
+                                    <Bindings>
+                                        <engine:DataBinding property="value" data-source-path="Alignment" binding-mode="TwoWay" />
+                                    </Bindings>
+                                </engine:EnumField>
+                                <engine:EnumField label="Set Parent To" value="Center" type="Misaki.ArtToolEditor.ParentType, Misaki.ArtTool.Editor" data-source-path="CurrentSelection">
+                                    <Bindings>
+                                        <engine:DataBinding property="value" data-source-path="Parent" binding-mode="TwoWay" />
+                                    </Bindings>
+                                </engine:EnumField>
+                                <editor:ObjectField label="Parent Object" type="UnityEngine.GameObject, UnityEngine.CoreModule" data-source-path="CurrentSelection">
+                                    <Bindings>
+                                        <engine:DataBinding property="value" data-source-path="ParentObject" binding-mode="TwoWay" />
+                                    </Bindings>
+                                </editor:ObjectField>
+                                <engine:Slider label="Object Spacing" value="1" high-value="100" show-input-field="true" data-source-path="CurrentSelection" low-value="0.01">
+                                    <Bindings>
+                                        <engine:DataBinding property="value" data-source-path="ObjectSpacing" binding-mode="TwoWay" />
+                                    </Bindings>
+                                </engine:Slider>
+                                <engine:EnumField label="Reference Point" type="Misaki.ArtToolEditor.ReferencePointType, Misaki.ArtTool.Editor" data-source-path="CurrentSelection">
+                                    <Bindings>
+                                        <engine:DataBinding property="value" data-source-path="ReferencePoint" binding-mode="TwoWay" />
+                                    </Bindings>
+                                </engine:EnumField>
+                                <engine:Slider label="Slop Filter" value="45" high-value="90" show-input-field="true" data-source-path="CurrentSelection">
+                                    <Bindings>
+                                        <engine:DataBinding property="value" data-source-path="SlopeFilter" binding-mode="TwoWay" />
+                                    </Bindings>
+                                </engine:Slider>
+                            </engine:VisualElement>
+                        </engine:VisualElement>
+                        <engine:VisualElement name="Randomness-Setting" class="SettingContainer">
+                            <engine:Label text="Randomness" name="Randomness-Header" class="SubHeader" />
+                            <engine:VisualElement name="Randomness-Properties" class="PropertyContainer" style="flex-grow: 1;">
+                                <editor:EnumFlagsField label="Enable" value="None" type="Misaki.ArtToolEditor.RandomnessType, Misaki.ArtTool.Editor" data-source-path="CurrentSelection">
+                                    <Bindings>
+                                        <engine:DataBinding property="value" data-source-path="Randomness" binding-mode="TwoWay" />
+                                    </Bindings>
+                                </editor:EnumFlagsField>
+                                <engine:Label text="Position" class="SmallHeader" />
+                                <engine:VisualElement class="PropertyContainer" style="flex-grow: 1;">
+                                    <engine:Vector3Field label="Min" value="0,0,0" name="Randomness-Position-Min" data-source-path="CurrentSelection">
+                                        <Bindings>
+                                            <engine:DataBinding property="value" data-source-path="PositionMin" binding-mode="TwoWay" />
+                                        </Bindings>
+                                    </engine:Vector3Field>
+                                    <engine:Vector3Field label="Max" value="0,0,0" name="Randomness-Position-Min" data-source-path="CurrentSelection">
+                                        <Bindings>
+                                            <engine:DataBinding property="value" data-source-path="PositionMax" binding-mode="TwoWay" />
+                                        </Bindings>
+                                    </engine:Vector3Field>
+                                </engine:VisualElement>
+                                <engine:Label text="Rotation" class="SmallHeader" />
+                                <engine:VisualElement class="PropertyContainer" style="flex-grow: 1;">
+                                    <engine:Vector3Field label="Min" value="0,0,0" name="Randomness-Rotation-Min" data-source-path="CurrentSelection">
+                                        <Bindings>
+                                            <engine:DataBinding property="value" data-source-path="RotationMin" binding-mode="TwoWay" />
+                                        </Bindings>
+                                    </engine:Vector3Field>
+                                    <engine:Vector3Field label="Max" value="0,0,0" name="Randomness-Rotation-Min" data-source-path="CurrentSelection">
+                                        <Bindings>
+                                            <engine:DataBinding property="value" data-source-path="RotationMax" binding-mode="TwoWay" />
+                                        </Bindings>
+                                    </engine:Vector3Field>
+                                </engine:VisualElement>
+                                <engine:Label text="Scale" class="SmallHeader" />
+                                <engine:VisualElement class="PropertyContainer" style="flex-grow: 1;">
+                                    <engine:Vector3Field label="Min" value="1,1,1" name="Randomness-Scale-Min" data-source-path="CurrentSelection">
+                                        <Bindings>
+                                            <engine:DataBinding property="value" data-source-path="ScaleMin" binding-mode="TwoWay" />
+                                        </Bindings>
+                                    </engine:Vector3Field>
+                                    <engine:Vector3Field label="Max" value="1,1,1" name="Randomness-Scale-Max" data-source-path="CurrentSelection">
+                                        <Bindings>
+                                            <engine:DataBinding property="value" data-source-path="ScaleMax" binding-mode="TwoWay" />
+                                        </Bindings>
+                                    </engine:Vector3Field>
+                                </engine:VisualElement>
+                            </engine:VisualElement>
+                        </engine:VisualElement>
+                    </engine:VisualElement>
+                </engine:VisualElement>
+            </engine:Tab>
+            <engine:Tab label="Brush" name="Brush-Tab" icon-image="project://database/Packages/com.misaki.art-tools/Editor/PrefabPainter/Icon/brush.png?fileID=2800000&amp;guid=08654cfbeb927194e962e78c4aa830c8&amp;type=3#brush" data-source-path="ViewModel.CurrentBrushSetting">
+                <engine:VisualElement name="Brush-Shape" style="flex-grow: 1;">
+                    <engine:Label text="Brush Shape" class="SubHeader" />
+                    <engine:VisualElement class="PropertyContainer" style="flex-grow: 1;">
+                        <engine:DropdownField label="Shape" choices="Circle,Grid,Spline" index="0" />
+                        <engine:Slider label="Size" value="1" high-value="10" show-input-field="true">
+                            <Bindings>
+                                <engine:DataBinding property="value" data-source-path="BrushSize" binding-mode="TwoWay" />
+                            </Bindings>
+                        </engine:Slider>
+                        <engine:FloatField label="Splat Spacing" value="0">
+                            <Bindings>
+                                <engine:DataBinding property="value" data-source-path="SplatSpacing" binding-mode="TwoWay" />
+                            </Bindings>
+                        </engine:FloatField>
+                        <engine:Slider label="Density" value="0.5" high-value="1" show-input-field="true">
+                            <Bindings>
+                                <engine:DataBinding property="value" data-source-path="Density" binding-mode="TwoWay" />
+                            </Bindings>
+                        </engine:Slider>
+                    </engine:VisualElement>
+                </engine:VisualElement>
+                <engine:VisualElement name="Brush-Feature" style="flex-grow: 1;">
+                    <engine:Label text="Brush Feature" class="SubHeader" />
+                    <engine:VisualElement class="PropertyContainer" style="flex-grow: 1;">
+                        <engine:HelpBox message-type="Warning" text="You need to set a GPU instancing drawer to let GPU instancing work properly" />
+                        <engine:DropdownField label="Use GPU Instancing" choices="Disable,Enable" index="0">
+                            <Bindings>
+                                <engine:DataBinding property="index" data-source-path="GpuInstancing" binding-mode="TwoWay" />
+                            </Bindings>
+                        </engine:DropdownField>
+                        <engine:DropdownField label="Use Gravity" choices="Disable,Enable" index="0">
+                            <Bindings>
+                                <engine:DataBinding property="index" data-source-path="Gravity" binding-mode="TwoWay" />
+                            </Bindings>
+                        </engine:DropdownField>
+                        <editor:LayerMaskField label="Paint Layer" value="1">
+                            <Bindings>
+                                <engine:DataBinding property="value" data-source-path="PaintLayer" binding-mode="TwoWay" />
+                            </Bindings>
+                        </editor:LayerMaskField>
+                        <engine:DropdownField label="Avoid Overlap" choices="Disable,Enable" index="1">
+                            <Bindings>
+                                <engine:DataBinding property="index" data-source-path="AvoidOverlap" binding-mode="TwoWay" />
+                            </Bindings>
+                        </engine:DropdownField>
+                    </engine:VisualElement>
+                </engine:VisualElement>
+            </engine:Tab>
+            <engine:Tab label="Setting" name="Setting-Tab" icon-image="project://database/Packages/com.misaki.art-tools/Editor/PrefabPainter/Icon/setting.png?fileID=2800000&amp;guid=1517c386de843a742afb10e4d9f20241&amp;type=3#setting">
+                <editor:ObjectField label="Instance Drawer" type="Misaki.ArtTool.InstanceDrawer, Misaki.ArtTool" />
+            </engine:Tab>
+        </engine:TabView>
+    </engine:VisualElement>
+</engine:UXML>

Editor/PrefabPainter/View/PrefabPainterWindow.uxml.meta

@@ -0,0 +1,10 @@
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+guid: a4196f221910b5442bc80d8305ee937e
+ScriptedImporter:
+  internalIDToNameTable: []
+  externalObjects: {}
+  serializedVersion: 2
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
+  script: {fileID: 13804, guid: 0000000000000000e000000000000000, type: 0}

Editor/PrefabPainter/ViewModel.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: cb4e69531da1a7a458134f4817b84290
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Editor/PrefabPainter/ViewModel/PrefabPainterViewModel.cs

@@ -0,0 +1,344 @@
+using System.Collections.Generic;
+using System.Linq;
+using UnityEditor;
+using UnityEngine;
+
+namespace Misaki.ArtToolEditor
+{
+    public class PrefabPainterViewModel
+    {
+        private static PrefabPainterViewModel _instance;
+        public static PrefabPainterViewModel Instance
+        {
+            get
+            {
+                _instance ??= new PrefabPainterViewModel();
+                return _instance;
+            }
+        }
+
+        private const string NamePrefix = "_(PainterInstance)";
+
+        public PaintType CurrentPaintType = PaintType.Disable;
+
+        public List<SourcePrefab> SourcePrefabs = new();
+        public bool RandomOrder = true;
+
+        public SourcePrefab CurrentSelection = new();
+
+        public BrustSetting CurrentBrushSetting = new();
+
+        private List<GameObject> paintedObjects;
+
+        // Use a grid to store painted objects for faster overlap checking
+        private const int GridSize = 5;
+        private Dictionary<Vector3, List<GameObject>> _grid = new Dictionary<Vector3, List<GameObject>>();
+
+        private Vector3 _lastBrushPosition = Vector3.zero;
+        private double _lastBrushApplication = 0;
+        private int _paintIndex;
+
+        public void OnNavigatedTo()
+        {
+            paintedObjects = new List<GameObject>();
+
+            var count = UnityEngine.SceneManagement.SceneManager.sceneCount;
+
+            for (var i = 0; i < count; i++)
+            {
+                var scene = UnityEngine.SceneManagement.SceneManager.GetSceneAt(i);
+
+                foreach (var rootGameObject in scene.GetRootGameObjects())
+                {
+                    paintedObjects.AddRange(Object.FindObjectsByType<GameObject>(FindObjectsSortMode.None).Where(go => go.name.Contains(NamePrefix)));
+                }
+            }
+
+            // Add to grid
+            foreach (var go in paintedObjects)
+            {
+                var gridPosition = new Vector3(
+                    Mathf.Floor(go.transform.position.x / GridSize) * GridSize,
+                    Mathf.Floor(go.transform.position.y / GridSize) * GridSize,
+                    Mathf.Floor(go.transform.position.z / GridSize) * GridSize
+                );
+
+                if (!_grid.ContainsKey(gridPosition))
+                {
+                    _grid[gridPosition] = new List<GameObject>();
+                }
+
+                _grid[gridPosition].Add(go);
+            }
+        }
+
+        public void DrawBrush()
+        {
+            if (CurrentPaintType == PaintType.Disable)
+            {
+                return;
+            }
+
+            var ray = HandleUtility.GUIPointToWorldRay(Event.current.mousePosition);
+
+            if (Physics.Raycast(ray, out var hit, Mathf.Infinity, CurrentBrushSetting.PaintLayer))
+            {
+                Handles.color = Color.blue;
+                Handles.DrawWireDisc(hit.point, hit.normal, CurrentBrushSetting.BrushSize);
+
+                if ((Event.current.type == EventType.MouseDown || Event.current.type == EventType.MouseDrag) && Event.current.button == 0 && !Event.current.alt)
+                {
+                    HandleUtility.AddDefaultControl(GUIUtility.GetControlID(FocusType.Passive));
+
+                    switch (CurrentPaintType)
+                    {
+                        case PaintType.Paint:
+                            PaintPrefabs(hit.point, hit.normal);
+                            break;
+                        case PaintType.Erase:
+                            ErasePrefabs(hit.point);
+                            break;
+                        default:
+                            break;
+                    }
+                    Event.current.Use();
+                }
+            }
+        }
+
+        private void PaintPrefabs(Vector3 position, Vector3 normal)
+        {
+
+            if (CurrentBrushSetting.Density <= 0 || Vector3.Distance(position, _lastBrushPosition) < CurrentBrushSetting.SplatSpacing)
+            {
+                return;
+            }
+
+            var activePrefabs = SourcePrefabs.FindAll(prefab => prefab.Enabled);
+            if (!activePrefabs.Any())
+            {
+                return;
+            }
+
+            // Prevent painting too frequently
+            if ((EditorApplication.timeSinceStartup - _lastBrushApplication) < Mathf.Max(0.016f, (1f - CurrentBrushSetting.Density)))
+            {
+                return;
+            }
+
+            _lastBrushApplication = EditorApplication.timeSinceStartup;
+
+            var useableArea = CurrentBrushSetting.BrushSize * CurrentBrushSetting.BrushSize * Mathf.PI * CurrentBrushSetting.Density;
+
+            if (CurrentBrushSetting.AvoidOverlap)
+            {
+                var gridPos = new Vector3(
+                    Mathf.Floor(position.x / GridSize) * GridSize,
+                    Mathf.Floor(position.y / GridSize) * GridSize,
+                    Mathf.Floor(position.z / GridSize) * GridSize
+                );
+
+                if (_grid.TryGetValue(gridPos, out var objectList))
+                {
+                    var count = objectList.Count;
+                    for (var i = 0; i < count; i++)
+                    {
+                        var go = objectList[i];
+
+                        if (go == null)
+                        {
+                            objectList.RemoveAt(i);
+                            continue;
+                        }
+
+                        if (Vector3.Distance(go.transform.position, position) < CurrentBrushSetting.BrushSize)
+                        {
+                            if (BoundUtilities.GetSphereBounds(go, out var spBound))
+                            {
+                                useableArea -= spBound.radius * spBound.radius * Mathf.PI;
+                            }
+                        }
+                    }
+                }
+            }
+
+            while (useableArea > 0)
+            {
+                // Select a prefab
+                var totalFrequency = activePrefabs.Sum(prefab => prefab.Frequency);
+
+                var index = 0;
+                if (RandomOrder)
+                {
+                    var randomValue = Random.Range(0, totalFrequency);
+                    var cumulativeFrequency = 0.0f;
+
+                    for (var i = 0; i < activePrefabs.Count; i++)
+                    {
+                        cumulativeFrequency += activePrefabs[i].Frequency;
+                        if (randomValue < cumulativeFrequency)
+                        {
+                            index = i;
+                            break;
+                        }
+                    }
+                }
+                else
+                {
+                    _paintIndex = (_paintIndex + 1) % activePrefabs.Count;
+                    index = _paintIndex;
+                }
+
+                var selectedPrefab = activePrefabs[index];
+
+                // Filter by slope
+                if (Vector3.Angle(normal, Vector3.up) > selectedPrefab.SlopeFilter)
+                {
+                    return;
+                }
+
+                // Randomize position, rotation, and scale
+                var randomOffset2D = Random.insideUnitSphere * CurrentBrushSetting.BrushSize;
+                var randomOffset = new Vector3(randomOffset2D.x, 0, randomOffset2D.y);
+                randomOffset = Vector3.ProjectOnPlane(randomOffset, normal);
+
+                Vector3 right, forward;
+                if (Vector3.Dot(normal, Vector3.up) > 0.999f)
+                {
+                    right = Vector3.Cross(Vector3.forward, normal);
+                    forward = Vector3.Cross(normal, right);
+                }
+                else
+                {
+                    right = Vector3.Cross(Vector3.up, normal);
+                    forward = Vector3.Cross(normal, right);
+                }
+
+                var rotation = Quaternion.LookRotation(forward, normal);
+
+                var scale = Vector3.one;
+
+                if ((selectedPrefab.Randomness & RandomnessType.Position) != 0)
+                {
+                    randomOffset += new Vector3(
+                        Random.Range(selectedPrefab.PositionMin.x, selectedPrefab.PositionMax.x),
+                        Random.Range(selectedPrefab.PositionMin.y, selectedPrefab.PositionMax.y),
+                        Random.Range(selectedPrefab.PositionMin.z, selectedPrefab.PositionMax.z)
+                    );
+                }
+
+                if ((selectedPrefab.Randomness & RandomnessType.Rotation) != 0)
+                {
+                    rotation *= Quaternion.Euler(
+                        Random.Range(selectedPrefab.RotationMin.x, selectedPrefab.RotationMax.x),
+                        Random.Range(selectedPrefab.RotationMin.y, selectedPrefab.RotationMax.y),
+                        Random.Range(selectedPrefab.RotationMin.z, selectedPrefab.RotationMax.z)
+                    );
+                }
+
+                if ((selectedPrefab.Randomness & RandomnessType.Scale) != 0)
+                {
+                    scale = new Vector3(
+                        Random.Range(selectedPrefab.ScaleMin.x, selectedPrefab.ScaleMax.x),
+                        Random.Range(selectedPrefab.ScaleMin.y, selectedPrefab.ScaleMax.y),
+                        Random.Range(selectedPrefab.ScaleMin.z, selectedPrefab.ScaleMax.z)
+                    );
+                }
+
+                var finalPosition = position + randomOffset;
+                var gridPosition = new Vector3(
+                    Mathf.Floor(finalPosition.x / GridSize) * GridSize,
+                    Mathf.Floor(finalPosition.y / GridSize) * GridSize,
+                    Mathf.Floor(finalPosition.z / GridSize) * GridSize
+                );
+
+                // Avoid overlap
+                if (CurrentBrushSetting.AvoidOverlap)
+                {
+                    var shouldSkip = false;
+
+                    if (_grid.TryGetValue(gridPosition, out var objectList))
+                    {
+                        var count = objectList.Count;
+                        for (var i = 0; i < count; i++)
+                        {
+                            var go = objectList[i];
+
+                            if (go == null)
+                            {
+                                paintedObjects.RemoveAt(i);
+                                continue;
+                            }
+
+                            if (Vector3.Distance(go.transform.position, finalPosition) < selectedPrefab.ObjectSpacing * 2)
+                            {
+                                shouldSkip = true;
+                                break;
+                            }
+                        }
+                    }
+
+                    if (shouldSkip)
+                    {
+                        return;
+                    }
+                }
+
+                if (!_grid.ContainsKey(gridPosition))
+                {
+                    _grid[gridPosition] = new List<GameObject>();
+                }
+
+                // Instantiate and place the prefab
+                var gameObject = (GameObject)PrefabUtility.InstantiatePrefab(selectedPrefab.Prefab);
+
+                gameObject.name = selectedPrefab.Prefab.name + NamePrefix;
+
+                gameObject.transform.position = finalPosition;
+                gameObject.transform.rotation = rotation;
+                gameObject.transform.localScale = scale;
+
+                paintedObjects.Add(gameObject);
+                _grid[gridPosition].Add(gameObject);
+
+                useableArea -= selectedPrefab.ObjectSpacing * selectedPrefab.ObjectSpacing * Mathf.PI;
+
+                _lastBrushPosition = position;
+            }
+        }
+
+        private void ErasePrefabs(Vector3 position)
+        {
+            var count = paintedObjects.Count;
+
+            for (var i = count - 1; i >= 0; i--)
+            {
+                var go = paintedObjects[i];
+
+                if (go == null)
+                {
+                    paintedObjects.RemoveAt(i);
+                    continue;
+                }
+
+                if (Vector3.Distance(go.transform.position, position) < CurrentBrushSetting.BrushSize)
+                {
+                    paintedObjects.RemoveAt(i);
+
+                    var gridPosition = new Vector3(
+                        Mathf.Floor(go.transform.position.x / GridSize) * GridSize,
+                        Mathf.Floor(go.transform.position.y / GridSize) * GridSize,
+                        Mathf.Floor(go.transform.position.z / GridSize) * GridSize
+                    );
+
+                    if (_grid.TryGetValue(gridPosition, out var objectList))
+                    {
+                        objectList.Remove(go);
+                    }
+
+                    Object.DestroyImmediate(go);
+                }
+            }
+        }
+    }
+}

Editor/PrefabPainter/ViewModel/PrefabPainterViewModel.cs.meta

@@ -0,0 +1,2 @@
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