Merge branch 'master' into collection-ui

.github/workflows/build_android.yml

@@ -33,4 +33,4 @@ jobs:
         git lfs pull
     - name: Build
       run: |
-        .\Development\Scripts\Windows\CallBuildTool.bat -build -log -printSDKs -arch=ARM64 -platform=Android -configuration=Release -buildtargets=FlaxGame
+        .\Development\Scripts\Windows\CallBuildTool.bat -build -log -printSDKs -dotnet=7 -arch=ARM64 -platform=Android -configuration=Release -buildtargets=FlaxGame

.github/workflows/build_ios.yml

@@ -33,4 +33,4 @@ jobs:
         git lfs pull
     - name: Build
       run: |
-        ./Development/Scripts/Mac/CallBuildTool.sh -build -log -arch=ARM64 -platform=iOS -configuration=Release -buildtargets=FlaxGame
+        ./Development/Scripts/Mac/CallBuildTool.sh -build -log -dotnet=7 -arch=ARM64 -platform=iOS -configuration=Release -buildtargets=FlaxGame

.github/workflows/build_linux.yml

@@ -36,7 +36,7 @@ jobs:
         git lfs pull
     - name: Build
       run: |
-        ./Development/Scripts/Linux/CallBuildTool.sh -build -log -printSDKs -arch=x64 -platform=Linux -configuration=Development -buildtargets=FlaxEditor
+        ./Development/Scripts/Linux/CallBuildTool.sh -build -log -printSDKs -dotnet=7 -arch=x64 -platform=Linux -configuration=Development -buildtargets=FlaxEditor
 
   # Game
   game-linux:
@@ -64,4 +64,4 @@ jobs:
         git lfs pull
     - name: Build
       run: |
-        ./Development/Scripts/Linux/CallBuildTool.sh -build -log -printSDKs -arch=x64 -platform=Linux -configuration=Release -buildtargets=FlaxGame
+        ./Development/Scripts/Linux/CallBuildTool.sh -build -log -printSDKs -dotnet=7 -arch=x64 -platform=Linux -configuration=Release -buildtargets=FlaxGame

.github/workflows/build_mac.yml

@@ -30,7 +30,7 @@ jobs:
         git lfs pull
     - name: Build
       run: |
-        ./Development/Scripts/Mac/CallBuildTool.sh -build -log -printSDKs -arch=x64 -platform=Mac -configuration=Development -buildtargets=FlaxEditor
+        ./Development/Scripts/Mac/CallBuildTool.sh -build -log -printSDKs -dotnet=7 -arch=x64 -platform=Mac -configuration=Development -buildtargets=FlaxEditor
 
   # Game
   game-mac:
@@ -55,4 +55,4 @@ jobs:
         git lfs pull
     - name: Build
       run: |
-        ./Development/Scripts/Mac/CallBuildTool.sh -build -log -printSDKs -arch=x64 -platform=Mac -configuration=Release -buildtargets=FlaxGame
+        ./Development/Scripts/Mac/CallBuildTool.sh -build -log -printSDKs -dotnet=7 -arch=x64 -platform=Mac -configuration=Release -buildtargets=FlaxGame

.github/workflows/build_windows.yml

@@ -30,7 +30,7 @@ jobs:
         git lfs pull
     - name: Build
       run: |
-        .\Development\Scripts\Windows\CallBuildTool.bat -build -log -printSDKs -arch=x64 -platform=Windows -configuration=Development -buildtargets=FlaxEditor
+        .\Development\Scripts\Windows\CallBuildTool.bat -build -log -printSDKs -dotnet=7 -arch=x64 -platform=Windows -configuration=Development -buildtargets=FlaxEditor
 
   # Game
   game-windows:
@@ -55,4 +55,4 @@ jobs:
         git lfs pull
     - name: Build
       run: |
-        .\Development\Scripts\Windows\CallBuildTool.bat -build -log -printSDKs -arch=x64 -platform=Windows -configuration=Release -buildtargets=FlaxGame
+        .\Development\Scripts\Windows\CallBuildTool.bat -build -log -printSDKs -dotnet=7 -arch=x64 -platform=Windows -configuration=Release -buildtargets=FlaxGame

.github/workflows/tests.yml

@@ -34,8 +34,8 @@ jobs:
         sudo apt-get install libx11-dev libxcursor-dev libxinerama-dev build-essential gettext libtool libtool-bin libpulse-dev libasound2-dev libjack-dev portaudio19-dev
     - name: Build
       run: |
-        ./GenerateProjectFiles.sh -vs2022 -log -verbose -printSDKs
-        ./Development/Scripts/Linux/CallBuildTool.sh -build -log -arch=x64 -platform=Linux -configuration=Development -buildtargets=FlaxTestsTarget
+        ./GenerateProjectFiles.sh -vs2022 -log -verbose -printSDKs -dotnet=7
+        ./Development/Scripts/Linux/CallBuildTool.sh -build -log -dotnet=7 -arch=x64 -platform=Linux -configuration=Development -buildtargets=FlaxTestsTarget
         dotnet msbuild Source/Tools/Flax.Build.Tests/Flax.Build.Tests.csproj /m /t:Restore,Build /p:Configuration=Debug /p:Platform=AnyCPU /nologo
         dotnet msbuild Source/Tools/Flax.Build.Tests/Flax.Build.Tests.csproj /m /t:Restore,Build /p:Configuration=Debug /p:Platform=AnyCPU /nologo
     - name: Test
@@ -48,7 +48,7 @@ jobs:
         dotnet test -f net7.0 Binaries/Tests/FlaxEngine.CSharp.dll
     - name: Test UseLargeWorlds
       run: |
-        ./Development/Scripts/Linux/CallBuildTool.sh -build -log -arch=x64 -platform=Linux -configuration=Development -buildtargets=FlaxTestsTarget -UseLargeWorlds=true
+        ./Development/Scripts/Linux/CallBuildTool.sh -build -log -dotnet=7 -arch=x64 -platform=Linux -configuration=Development -buildtargets=FlaxTestsTarget -UseLargeWorlds=true
         ${GITHUB_WORKSPACE}/Binaries/Editor/Linux/Development/FlaxTests
 
   # Tests on Windows
@@ -72,8 +72,8 @@ jobs:
         git lfs pull
     - name: Build
       run: |
-        .\GenerateProjectFiles.bat -vs2022 -log -verbose -printSDKs
-        .\Development\Scripts\Windows\CallBuildTool.bat -build -log -arch=x64 -platform=Windows -configuration=Development -buildtargets=FlaxTestsTarget
+        .\GenerateProjectFiles.bat -vs2022 -log -verbose -printSDKs -dotnet=7
+        .\Development\Scripts\Windows\CallBuildTool.bat -build -log -dotnet=7 -arch=x64 -platform=Windows -configuration=Development -buildtargets=FlaxTestsTarget
         dotnet msbuild Source\Tools\Flax.Build.Tests\Flax.Build.Tests.csproj /m /t:Restore,Build /p:Configuration=Debug /p:Platform=AnyCPU /nologo
     - name: Test
       run: |

.gitignore

@@ -12,6 +12,7 @@ Source/*.csproj
 /Package_*/
 !Source/Engine/Debug
 /Source/Platforms/Editor/Linux/Mono/etc/mono/registry
+PackageEditor_Cert.command
 PackageEditor_Cert.bat
 PackagePlatforms_Cert.bat
 

Content/Editor/MaterialTemplates/Features/ForwardShading.hlsl

@@ -133,6 +133,8 @@ void PS_Forward(
 	// Add lighting (apply ambient occlusion)
 	output.rgb += light.rgb * gBuffer.AO;
 
+#endif
+
 #if USE_FOG
 	// Calculate exponential height fog
 	float4 fog = GetExponentialHeightFog(ExponentialHeightFog, materialInput.WorldPosition, ViewPos, 0);
@@ -148,7 +150,5 @@ void PS_Forward(
 	output = float4(lerp(float3(1, 1, 1), output.rgb, fog.aaa * fog.aaa), output.a);
 #endif
 
-#endif
-	
 #endif
 }

Content/Editor/Scripting/ScriptTemplate.cs

@@ -33,4 +33,3 @@ public class %class% : Script
         // Here you can add code that needs to be called every frame
     }
 }
-

Flax.flaxproj

@@ -3,7 +3,8 @@
   "Version": {
     "Major": 1,
     "Minor": 7,
-    "Build": 6401
+    "Revision": 2,
+    "Build": 6407
   },
   "Company": "Flax",
   "Copyright": "Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.",

GenerateProjectFiles.bat

@@ -15,7 +15,7 @@ if errorlevel 1 goto BuildToolFailed
 
 :: Build bindings for all editor configurations
 echo Building C# bindings...
-Binaries\Tools\Flax.Build.exe -build -BuildBindingsOnly -arch=x64 -platform=Windows --buildTargets=FlaxEditor,FlaxGame
+Binaries\Tools\Flax.Build.exe -build -BuildBindingsOnly -arch=x64 -platform=Windows --buildTargets=FlaxEditor
 
 popd
 echo Done!

GenerateProjectFiles.command

@@ -14,4 +14,4 @@ bash ./Development/Scripts/Mac/CallBuildTool.sh --genproject "$@"
 # Build bindings for all editor configurations
 echo Building C# bindings...
 # TODO: Detect the correct architecture here
-Binaries/Tools/Flax.Build -build -BuildBindingsOnly -arch=ARM64 -platform=Mac --buildTargets=FlaxEditor,FlaxGame
+Binaries/Tools/Flax.Build -build -BuildBindingsOnly -arch=ARM64 -platform=Mac --buildTargets=FlaxEditor

GenerateProjectFiles.sh

@@ -14,4 +14,4 @@ bash ./Development/Scripts/Linux/CallBuildTool.sh --genproject "$@"
 # Build bindings for all editor configurations
 echo Building C# bindings...
 # TODO: Detect the correct architecture here
-Binaries/Tools/Flax.Build -build -BuildBindingsOnly -arch=x64 -platform=Linux --buildTargets=FlaxEditor,FlaxGame
+Binaries/Tools/Flax.Build -build -BuildBindingsOnly -arch=x64 -platform=Linux --buildTargets=FlaxEditor

PackageAll.bat

@@ -7,7 +7,7 @@ pushd
 echo Performing the full package...
 
 rem Run the build tool.
-call "Development\Scripts\Windows\CallBuildTool.bat" -deploy -deployEditor -deployPlatforms -verbose -log -logFile="Cache\Intermediate\PackageLog.txt" %*
+call "Development\Scripts\Windows\CallBuildTool.bat" -deploy -deployEditor -deployPlatforms -dotnet=7 -verbose -log -logFile="Cache\Intermediate\PackageLog.txt" %*
 if errorlevel 1 goto BuildToolFailed
 
 popd

PackageEditor.bat

@@ -7,7 +7,7 @@ pushd
 echo Building and packaging Flax Editor...
 
 rem Run the build tool.
-call "Development\Scripts\Windows\CallBuildTool.bat" -deploy -deployEditor -verbose -log -logFile="Cache\Intermediate\PackageLog.txt" %*
+call "Development\Scripts\Windows\CallBuildTool.bat" -deploy -deployEditor -dotnet=7 -verbose -log -logFile="Cache\Intermediate\PackageLog.txt" %*
 if errorlevel 1 goto BuildToolFailed
 
 popd

PackageEditor.command

@@ -9,4 +9,4 @@ echo Building and packaging Flax Editor...
 cd "`dirname "$0"`"
 
 # Run Flax.Build (also pass the arguments)
-bash ./Development/Scripts/Mac/CallBuildTool.sh --deploy --deployEditor --verbose --log --logFile="Cache/Intermediate/PackageLog.txt" "$@"
+bash ./Development/Scripts/Mac/CallBuildTool.sh --deploy --deployEditor --dotnet=7 --verbose --log --logFile="Cache/Intermediate/PackageLog.txt" "$@"

PackageEditor.sh

@@ -9,4 +9,4 @@ echo Building and packaging Flax Editor...
 cd "`dirname "$0"`"
 
 # Run Flax.Build (also pass the arguments)
-bash ./Development/Scripts/Linux/CallBuildTool.sh --deploy --deployEditor --verbose --log --logFile="Cache/Intermediate/PackageLog.txt" "$@"
+bash ./Development/Scripts/Linux/CallBuildTool.sh --deploy --deployEditor --dotnet=7 --verbose --log --logFile="Cache/Intermediate/PackageLog.txt" "$@"

PackagePlatforms.bat

@@ -7,7 +7,7 @@ pushd
 echo Building and packaging platforms data...
 
 rem Run the build tool.
-call "Development\Scripts\Windows\CallBuildTool.bat" -deploy -deployPlatforms -verbose -log -logFile="Cache\Intermediate\PackageLog.txt" %*
+call "Development\Scripts\Windows\CallBuildTool.bat" -deploy -deployPlatforms -dotnet=7 -verbose -log -logFile="Cache\Intermediate\PackageLog.txt" %*
 if errorlevel 1 goto BuildToolFailed
 
 popd

PackagePlatforms.command

@@ -9,4 +9,4 @@ echo Building and packaging platforms data...
 cd "`dirname "$0"`"
 
 # Run Flax.Build (also pass the arguments)
-bash ./Development/Scripts/Mac/CallBuildTool.sh --deploy --deployPlatforms --verbose --log --logFile="Cache/Intermediate/PackageLog.txt" "$@"
+bash ./Development/Scripts/Mac/CallBuildTool.sh --deploy --deployPlatforms --dotnet=7 --verbose --log --logFile="Cache/Intermediate/PackageLog.txt" "$@"

PackagePlatforms.sh

@@ -9,4 +9,4 @@ echo Building and packaging platforms data...
 cd "`dirname "$0"`"
 
 # Run Flax.Build (also pass the arguments)
-bash ./Development/Scripts/Linux/CallBuildTool.sh --deploy --deployPlatforms --verbose --log --logFile="Cache/Intermediate/PackageLog.txt" "$@"
+bash ./Development/Scripts/Linux/CallBuildTool.sh --deploy --deployPlatforms --dotnet=7 --verbose --log --logFile="Cache/Intermediate/PackageLog.txt" "$@"

README.md

@@ -4,7 +4,7 @@
 <a href="https://flaxengine.com/discord"><img src="https://discordapp.com/api/guilds/437989205315158016/widget.png"/></a>
 
 Flax Engine is a high quality modern 3D game engine written in C++ and C#.
-From stunning graphics to powerful scripts - Flax can give everything for your games. Designed for fast workflow with many ready to use features waiting for you right now. To learn more see the website ([www.flaxengine.com](https://flaxengine.com)).
+From stunning graphics to powerful scripts, it's designed for fast workflow with many ready-to-use features waiting for you right now. To learn more see the website ([www.flaxengine.com](https://flaxengine.com)).
 
 This repository contains full source code of the Flax Engine (excluding NDA-protected platforms support). Anyone is welcome to contribute or use the modified source in Flax-based games.
 

Source/Editor/Content/AssetPickerValidator.cs

@@ -0,0 +1,292 @@
+using System;
+using System.IO;
+using FlaxEditor.Scripting;
+using FlaxEngine;
+using FlaxEngine.Utilities;
+
+namespace FlaxEditor.Content;
+
+/// <summary>
+/// Manages and converts the selected content item to the appropriate types. Useful for drag operations.
+/// </summary>
+public class AssetPickerValidator : IContentItemOwner
+{
+    private Asset _selected;
+    private ContentItem _selectedItem;
+    private ScriptType _type;
+    private string _fileExtension;
+
+    /// <summary>
+    /// Gets or sets the selected item.
+    /// </summary>
+    public ContentItem SelectedItem
+    {
+        get => _selectedItem;
+        set
+        {
+            if (_selectedItem == value)
+                return;
+            if (value == null)
+            {
+                if (_selected == null && _selectedItem is SceneItem)
+                {
+                    // Deselect scene reference
+                    _selectedItem.RemoveReference(this);
+                    _selectedItem = null;
+                    _selected = null;
+                    OnSelectedItemChanged();
+                    return;
+                }
+
+                // Deselect
+                _selectedItem?.RemoveReference(this);
+                _selectedItem = null;
+                _selected = null;
+                OnSelectedItemChanged();
+            }
+            else if (value is SceneItem item)
+            {
+                if (_selectedItem == item)
+                    return;
+                if (!IsValid(item))
+                    item = null;
+
+                // Change value to scene reference (cannot load asset because scene can be already loaded - duplicated ID issue)
+                _selectedItem?.RemoveReference(this);
+                _selectedItem = item;
+                _selected = null;
+                _selectedItem?.AddReference(this);
+                OnSelectedItemChanged();
+            }
+            else if (value is AssetItem assetItem)
+            {
+                SelectedAsset = FlaxEngine.Content.LoadAsync(assetItem.ID);
+            }
+            else
+            {
+                // Change value
+                _selectedItem?.RemoveReference(this);
+                _selectedItem = value;
+                _selected = null;
+                OnSelectedItemChanged();
+            }
+        }
+    }
+
+    /// <summary>
+    /// Gets or sets the selected asset identifier.
+    /// </summary>
+    public Guid SelectedID
+    {
+        get
+        {
+            if (_selected != null)
+                return _selected.ID;
+            if (_selectedItem is AssetItem assetItem)
+                return assetItem.ID;
+            return Guid.Empty;
+        }
+        set => SelectedItem = Editor.Instance.ContentDatabase.FindAsset(value);
+    }
+
+    /// <summary>
+    /// Gets or sets the selected content item path.
+    /// </summary>
+    public string SelectedPath
+    {
+        get
+        {
+            string path = _selectedItem?.Path ?? _selected?.Path;
+            if (path != null)
+            {
+                // Convert into path relative to the project (cross-platform)
+                var projectFolder = Globals.ProjectFolder;
+                if (path.StartsWith(projectFolder))
+                    path = path.Substring(projectFolder.Length + 1);
+            }
+            return path;
+        }
+        set
+        {
+            if (string.IsNullOrEmpty(value))
+            {
+                SelectedItem = null;
+            }
+            else
+            {
+                var path = StringUtils.IsRelative(value) ? Path.Combine(Globals.ProjectFolder, value) : value;
+                SelectedItem = Editor.Instance.ContentDatabase.Find(path);
+            }
+        }
+    }
+
+    /// <summary>
+    /// Gets or sets the selected asset object.
+    /// </summary>
+    public Asset SelectedAsset
+    {
+        get => _selected;
+        set
+        {
+            // Check if value won't change
+            if (value == _selected)
+                return;
+
+            // Find item from content database and check it
+            var item = value ? Editor.Instance.ContentDatabase.FindAsset(value.ID) : null;
+            if (item != null && !IsValid(item))
+                item = null;
+
+            // Change value
+            _selectedItem?.RemoveReference(this);
+            _selectedItem = item;
+            _selected = value;
+            _selectedItem?.AddReference(this);
+            OnSelectedItemChanged();
+        }
+    }
+
+    /// <summary>
+    /// Gets or sets the assets types that this picker accepts (it supports types derived from the given type). Use <see cref="ScriptType.Null"/> for generic file picker.
+    /// </summary>
+    public ScriptType AssetType
+    {
+        get => _type;
+        set
+        {
+            if (_type != value)
+            {
+                _type = value;
+
+                // Auto deselect if the current value is invalid
+                if (_selectedItem != null && !IsValid(_selectedItem))
+                    SelectedItem = null;
+            }
+        }
+    }
+
+    /// <summary>
+    /// Gets or sets the content items extensions filter. Null if unused.
+    /// </summary>
+    public string FileExtension
+    {
+        get => _fileExtension;
+        set
+        {
+            if (_fileExtension != value)
+            {
+                _fileExtension = value;
+
+                // Auto deselect if the current value is invalid
+                if (_selectedItem != null && !IsValid(_selectedItem))
+                    SelectedItem = null;
+            }
+        }
+    }
+
+    /// <summary>
+    /// Occurs when selected item gets changed.
+    /// </summary>
+    public event Action SelectedItemChanged;
+
+    /// <summary>
+    /// The custom callback for assets validation. Cane be used to implement a rule for assets to pick.
+    /// </summary>
+    public Func<ContentItem, bool> CheckValid;
+
+    /// <summary>
+    /// Returns whether item is valid.
+    /// </summary>
+    /// <param name="item"></param>
+    /// <returns></returns>
+    public bool IsValid(ContentItem item)
+    {
+        if (_fileExtension != null && !item.Path.EndsWith(_fileExtension))
+            return false;
+        if (CheckValid != null && !CheckValid(item))
+            return false;
+        if (_type == ScriptType.Null)
+            return true;
+
+        if (item is AssetItem assetItem)
+        {
+            // Faster path for binary items (in-built)
+            if (assetItem is BinaryAssetItem binaryItem)
+                return _type.IsAssignableFrom(new ScriptType(binaryItem.Type));
+
+            // Type filter
+            var type = TypeUtils.GetType(assetItem.TypeName);
+            if (_type.IsAssignableFrom(type))
+                return true;
+
+            // Json assets can contain any type of the object defined by the C# type (data oriented design)
+            if (assetItem is JsonAssetItem && (_type.Type == typeof(JsonAsset) || _type.Type == typeof(Asset)))
+                return true;
+
+            // Special case for scene asset references
+            if (_type.Type == typeof(SceneReference) && assetItem is SceneItem)
+                return true;
+        }
+
+        return false;
+    }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="AssetPickerValidator"/> class.
+    /// </summary>
+    public AssetPickerValidator()
+    : this(new ScriptType(typeof(Asset)))
+    {
+    }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="AssetPickerValidator"/> class.
+    /// </summary>
+    /// <param name="assetType">The assets types that this picker accepts.</param>
+    public AssetPickerValidator(ScriptType assetType)
+    {
+        _type = assetType;
+    }
+
+    /// <summary>
+    /// Called when selected item gets changed.
+    /// </summary>
+    protected virtual void OnSelectedItemChanged()
+    {
+        SelectedItemChanged?.Invoke();
+    }
+
+    /// <inheritdoc />
+    public void OnItemDeleted(ContentItem item)
+    {
+        // Deselect item
+        SelectedItem = null;
+    }
+
+    /// <inheritdoc />
+    public void OnItemRenamed(ContentItem item)
+    {
+    }
+
+    /// <inheritdoc />
+    public void OnItemReimported(ContentItem item)
+    {
+    }
+
+    /// <inheritdoc />
+    public void OnItemDispose(ContentItem item)
+    {
+        // Deselect item
+        SelectedItem = null;
+    }
+
+    /// <summary>
+    /// Call to remove reference from the selected item.
+    /// </summary>
+    public void OnDestroy()
+    {
+        _selectedItem?.RemoveReference(this);
+        _selectedItem = null;
+        _selected = null;
+    }
+}

Source/Editor/Content/Import/ModelImportEntry.cs

@@ -12,13 +12,14 @@ namespace FlaxEngine.Tools
     {
         partial struct Options
         {
-            private bool ShowGeometry => Type == ModelTool.ModelType.Model || Type == ModelTool.ModelType.SkinnedModel;
-            private bool ShowModel => Type == ModelTool.ModelType.Model;
-            private bool ShowSkinnedModel => Type == ModelTool.ModelType.SkinnedModel;
-            private bool ShowAnimation => Type == ModelTool.ModelType.Animation;
+            private bool ShowGeometry => Type == ModelType.Model || Type == ModelType.SkinnedModel || Type == ModelType.Prefab;
+            private bool ShowModel => Type == ModelType.Model || Type == ModelType.Prefab;
+            private bool ShowSkinnedModel => Type == ModelType.SkinnedModel || Type == ModelType.Prefab;
+            private bool ShowAnimation => Type == ModelType.Animation || Type == ModelType.Prefab;
             private bool ShowSmoothingNormalsAngle => ShowGeometry && CalculateNormals;
             private bool ShowSmoothingTangentsAngle => ShowGeometry && CalculateTangents;
-            private bool ShowFramesRange => ShowAnimation && Duration == ModelTool.AnimationDuration.Custom;
+            private bool ShowFramesRange => ShowAnimation && Duration == AnimationDuration.Custom;
+            private bool ShowSplitting => Type != ModelType.Prefab;
         }
     }
 }

Source/Editor/Content/PreviewsCache.cpp

@@ -5,6 +5,7 @@
 #include "Engine/Graphics/GPUContext.h"
 #include "Engine/Threading/Threading.h"
 #include "Engine/Graphics/RenderTools.h"
+#include "Engine/Content/Content.h"
 #include "Engine/Content/Factories/BinaryAssetFactory.h"
 #include "Engine/ContentImporters/AssetsImportingManager.h"
 #include "Engine/Content/Upgraders/TextureAssetUpgrader.h"
@@ -92,15 +93,12 @@ SpriteHandle PreviewsCache::FindSlot(const Guid& id)
 {
     if (WaitForLoaded())
         return SpriteHandle::Invalid;
-
-    // Find entry
     int32 index;
     if (_assets.Find(id, index))
     {
         const String spriteName = StringUtils::ToString(index);
         return FindSprite(spriteName);
     }
-
     return SpriteHandle::Invalid;
 }
 
@@ -114,6 +112,17 @@ Asset::LoadResult PreviewsCache::load()
         return LoadResult::Failed;
     _assets.Set(previewsMetaChunk->Get<Guid>(), ASSETS_ICONS_PER_ATLAS);
 
+    // Verify if cached assets still exist (don't store thumbnails for removed files)
+    AssetInfo assetInfo;
+    for (Guid& id : _assets)
+    {
+        if (id.IsValid() && Content::GetAsset(id) == nullptr && !Content::GetAssetInfo(id, assetInfo))
+        {
+            // Free slot (no matter the texture contents)
+            id = Guid::Empty;
+        }
+    }
+
     // Setup atlas sprites array
     Sprite sprite;
     sprite.Area.Size = static_cast<float>(ASSET_ICON_SIZE) / ASSETS_ICONS_ATLAS_SIZE;
@@ -162,7 +171,7 @@ SpriteHandle PreviewsCache::OccupySlot(GPUTexture* source, const Guid& id)
     if (WaitForLoaded())
         return SpriteHandle::Invalid;
 
-    // Find free slot and for that asset
+    // Find this asset slot or use the first empty
     int32 index = _assets.Find(id);
     if (index == INVALID_INDEX)
         index = _assets.Find(Guid::Empty);
@@ -201,14 +210,12 @@ bool PreviewsCache::ReleaseSlot(const Guid& id)
 {
     bool result = false;
     ScopeLock lock(Locker);
-
     int32 index = _assets.Find(id);
     if (index != INVALID_INDEX)
     {
         _assets[index] = Guid::Empty;
         result = true;
     }
-
     return result;
 }
 

Source/Editor/Content/Proxy/AssetProxy.cs

@@ -22,6 +22,22 @@ namespace FlaxEditor.Content
         /// </summary>
         public abstract string TypeName { get; }
 
+        /// <summary>
+        /// Gets a value indicating whether this instance is virtual Proxy not linked to any asset.
+        /// </summary>
+        protected virtual bool IsVirtual { get; }
+
+        /// <summary>
+        /// Determines whether [is virtual proxy].
+        /// </summary>
+        /// <returns>
+        ///   <c>true</c> if [is virtual proxy]; otherwise, <c>false</c>.
+        /// </returns>
+        public bool IsVirtualProxy()
+        {
+            return IsVirtual && CanExport == false;
+        }
+
         /// <summary>
         /// Checks if this proxy supports the given asset type id at the given path.
         /// </summary>

Source/Editor/Content/Proxy/ModelProxy.cs

@@ -72,7 +72,10 @@ namespace FlaxEditor.Content
         {
             if (_preview == null)
             {
-                _preview = new ModelPreview(false);
+                _preview = new ModelPreview(false)
+                {
+                    ScaleToFit = false,
+                };
                 InitAssetPreview(_preview);
             }
 
@@ -91,6 +94,7 @@ namespace FlaxEditor.Content
             _preview.Model = (Model)request.Asset;
             _preview.Parent = guiRoot;
             _preview.SyncBackbufferSize();
+            _preview.ViewportCamera.SetArcBallView(_preview.Model.GetBox());
 
             _preview.Task.OnDraw();
         }

Source/Editor/Content/Proxy/SceneProxy.cs

@@ -1,6 +1,7 @@
 // Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
 
 using System;
+using FlaxEditor.GUI.ContextMenu;
 using FlaxEditor.Windows;
 using FlaxEngine;
 
@@ -30,6 +31,12 @@ namespace FlaxEditor.Content
             return item is SceneItem;
         }
 
+        /// <inheritdoc />
+        public override bool AcceptsAsset(string typeName, string path)
+        {
+            return (typeName == Scene.AssetTypename || typeName == Scene.EditorPickerTypename) && path.EndsWith(FileExtension, StringComparison.OrdinalIgnoreCase);
+        }
+
         /// <inheritdoc />
         public override bool CanCreate(ContentFolder targetLocation)
         {
@@ -62,5 +69,15 @@ namespace FlaxEditor.Content
         {
             return new SceneItem(path, id);
         }
+
+        /// <inheritdoc />
+        public override void OnContentWindowContextMenu(ContextMenu menu, ContentItem item)
+        {
+            var id = ((SceneItem)item).ID;
+            if (Level.FindScene(id) == null)
+            {
+                menu.AddButton("Open (additive)", () => { Editor.Instance.Scene.OpenScene(id, true); });
+            }
+        }
     }
 }

Source/Editor/Content/Thumbnails/ThumbnailRequest.cs

@@ -35,6 +35,11 @@ namespace FlaxEditor.Content.Thumbnails
             /// The finalized state.
             /// </summary>
             Disposed,
+
+            /// <summary>
+            /// The request has failed (eg. asset cannot be loaded).
+            /// </summary>
+            Failed,
         };
 
         /// <summary>
@@ -78,6 +83,14 @@ namespace FlaxEditor.Content.Thumbnails
             Proxy = proxy;
         }
 
+        internal void Update()
+        {
+            if (State == States.Prepared && (!Asset || Asset.LastLoadFailed))
+            {
+                State = States.Failed;
+            }
+        }
+
         /// <summary>
         /// Prepares this request.
         /// </summary>
@@ -85,11 +98,8 @@ namespace FlaxEditor.Content.Thumbnails
         {
             if (State != States.Created)
                 throw new InvalidOperationException();
-
-            // Prepare
             Asset = FlaxEngine.Content.LoadAsync(Item.Path);
             Proxy.OnThumbnailDrawPrepare(this);
-
             State = States.Prepared;
         }
 
@@ -101,9 +111,7 @@ namespace FlaxEditor.Content.Thumbnails
         {
             if (State != States.Prepared)
                 throw new InvalidOperationException();
-
             Item.Thumbnail = icon;
-
             State = States.Rendered;
         }
 

Source/Editor/Content/Thumbnails/ThumbnailsModule.cs

@@ -21,15 +21,11 @@ namespace FlaxEditor.Content.Thumbnails
         /// </summary>
         public const float MinimumRequiredResourcesQuality = 0.8f;
 
-        // TODO: free atlas slots for deleted assets
-
         private readonly List<PreviewsCache> _cache = new List<PreviewsCache>(4);
         private readonly string _cacheFolder;
-
-        private DateTime _lastFlushTime;
-
         private readonly List<ThumbnailRequest> _requests = new List<ThumbnailRequest>(128);
         private readonly PreviewRoot _guiRoot = new PreviewRoot();
+        private DateTime _lastFlushTime;
         private RenderTask _task;
         private GPUTexture _output;
 
@@ -88,7 +84,6 @@ namespace FlaxEditor.Content.Thumbnails
                         }
                     }
 
-                    // Add request
                     AddRequest(assetItem, proxy);
                 }
             }
@@ -118,15 +113,15 @@ namespace FlaxEditor.Content.Thumbnails
                 for (int i = 0; i < _cache.Count; i++)
                 {
                     if (_cache[i].ReleaseSlot(assetItem.ID))
-                    {
                         break;
-                    }
                 }
             }
         }
 
         internal static bool HasMinimumQuality(TextureBase asset)
         {
+            if (asset.HasStreamingError)
+                return true; // Don't block thumbnails queue when texture fails to stream in (eg. unsupported format)
             var mipLevels = asset.MipLevels;
             var minMipLevels = Mathf.Min(mipLevels, 7);
             return asset.IsLoaded && asset.ResidentMipLevels >= Mathf.Max(minMipLevels, (int)(mipLevels * MinimumRequiredResourcesQuality));
@@ -198,13 +193,7 @@ namespace FlaxEditor.Content.Thumbnails
         /// <inheritdoc />
         void IContentItemOwner.OnItemDeleted(ContentItem item)
         {
-            if (item is AssetItem assetItem)
-            {
-                lock (_requests)
-                {
-                    RemoveRequest(assetItem);
-                }
-            }
+            DeletePreview(item);
         }
 
         /// <inheritdoc />
@@ -406,18 +395,16 @@ namespace FlaxEditor.Content.Thumbnails
             for (int i = 0; i < maxChecks; i++)
             {
                 var request = _requests[i];
-
                 try
                 {
                     if (request.IsReady)
-                    {
                         return request;
-                    }
                 }
                 catch (Exception ex)
                 {
-                    Editor.LogWarning(ex);
                     Editor.LogWarning($"Failed to prepare thumbnail rendering for {request.Item.ShortName}.");
+                    Editor.LogWarning(ex);
+                    _requests.RemoveAt(i--);
                 }
             }
 
@@ -496,10 +483,7 @@ namespace FlaxEditor.Content.Thumbnails
         {
             // Wait some frames before start generating previews (late init feature)
             if (Time.TimeSinceStartup < 1.0f || HasAllAtlasesLoaded() == false)
-            {
-                // Back
                 return;
-            }
 
             lock (_requests)
             {
@@ -515,9 +499,9 @@ namespace FlaxEditor.Content.Thumbnails
                     for (int i = 0; i < checks; i++)
                     {
                         var request = _requests[i];
-
                         try
                         {
+                            request.Update();
                             if (request.IsReady)
                             {
                                 isAnyReady = true;
@@ -526,11 +510,16 @@ namespace FlaxEditor.Content.Thumbnails
                             {
                                 request.Prepare();
                             }
+                            else if (request.State == ThumbnailRequest.States.Failed)
+                            {
+                                _requests.RemoveAt(i--);
+                            }
                         }
                         catch (Exception ex)
                         {
-                            Editor.LogWarning(ex);
                             Editor.LogWarning($"Failed to prepare thumbnail rendering for {request.Item.ShortName}.");
+                            Editor.LogWarning(ex);
+                            _requests.RemoveAt(i--);
                         }
                     }
 

Source/Editor/Content/Tree/ContentTreeNode.cs

@@ -24,6 +24,16 @@ namespace FlaxEditor.Content
         /// </summary>
         protected ContentFolder _folder;
 
+        /// <summary>
+        /// Whether this node can be deleted.
+        /// </summary>
+        public virtual bool CanDelete => true;
+        
+        /// <summary>
+        /// Whether this node can be duplicated.
+        /// </summary>
+        public virtual bool CanDuplicate => true;
+
         /// <summary>
         /// Gets the content folder item.
         /// </summary>
@@ -86,6 +96,7 @@ namespace FlaxEditor.Content
                 Folder.ParentFolder = parent.Folder;
                 Parent = parent;
             }
+            IconColor = Style.Current.Foreground;
         }
 
         /// <summary>
@@ -300,7 +311,7 @@ namespace FlaxEditor.Content
                     StartRenaming();
                     return true;
                 case KeyboardKeys.Delete:
-                    if (Folder.Exists)
+                    if (Folder.Exists && CanDelete)
                         Editor.Instance.Windows.ContentWin.Delete(Folder);
                     return true;
                 }
@@ -309,7 +320,7 @@ namespace FlaxEditor.Content
                     switch (key)
                     {
                     case KeyboardKeys.D:
-                        if (Folder.Exists)
+                        if (Folder.Exists && CanDuplicate)
                             Editor.Instance.Windows.ContentWin.Duplicate(Folder);
                         return true;
                     }

Source/Editor/Content/Tree/MainContentTreeNode.cs

@@ -12,6 +12,12 @@ namespace FlaxEditor.Content
     {
         private FileSystemWatcher _watcher;
 
+        /// <inheritdoc />
+        public override bool CanDelete => false;
+
+        /// <inheritdoc />
+        public override bool CanDuplicate => false;
+
         /// <summary>
         /// Initializes a new instance of the <see cref="MainContentTreeNode"/> class.
         /// </summary>

Source/Editor/Cooker/CookingData.h

@@ -12,6 +12,13 @@
 class GameCooker;
 class PlatformTools;
 
+#if OFFICIAL_BUILD
+// Use the fixed .NET SDK version in packaged builds for compatibility (FlaxGame is precompiled with it)
+#define GAME_BUILD_DOTNET_VER TEXT("-dotnet=7")
+#else
+#define GAME_BUILD_DOTNET_VER TEXT("")
+#endif
+
 /// <summary>
 /// Game building options. Used as flags.
 /// </summary>

Source/Editor/Cooker/Platform/Android/AndroidPlatformTools.cpp

@@ -169,6 +169,30 @@ bool AndroidPlatformTools::OnPostProcess(CookingData& data)
         permissions += String::Format(TEXT("\n    <uses-permission android:name=\"{0}\" />"), e.Item);
     }
 
+    // Setup default Android screen orientation
+    auto defaultOrienation = platformSettings->DefaultOrientation;
+    String orientation = String("fullSensor");
+    switch (defaultOrienation)
+    {
+    case AndroidPlatformSettings::ScreenOrientation::Portrait:
+        orientation = String("portrait");
+        break;
+    case AndroidPlatformSettings::ScreenOrientation::PortraitReverse:
+        orientation = String("reversePortrait");
+        break;
+    case AndroidPlatformSettings::ScreenOrientation::LandscapeRight:
+        orientation = String("landscape");
+        break;
+    case AndroidPlatformSettings::ScreenOrientation::LandscapeLeft:
+        orientation = String("reverseLandscape");
+        break;
+    case AndroidPlatformSettings::ScreenOrientation::AutoRotation:
+        orientation = String("fullSensor");
+        break;
+    default:
+        break;
+    }
+
     // Setup Android application attributes
     String attributes;
     if (data.Configuration != BuildConfiguration::Release)
@@ -223,6 +247,7 @@ bool AndroidPlatformTools::OnPostProcess(CookingData& data)
     EditorUtilities::ReplaceInFile(manifestPath, TEXT("${PackageName}"), packageName);
     EditorUtilities::ReplaceInFile(manifestPath, TEXT("${ProjectVersion}"), projectVersion);
     EditorUtilities::ReplaceInFile(manifestPath, TEXT("${AndroidPermissions}"), permissions);
+    EditorUtilities::ReplaceInFile(manifestPath, TEXT("${DefaultOrientation}"), orientation);
     EditorUtilities::ReplaceInFile(manifestPath, TEXT("${AndroidAttributes}"), attributes);
     const String stringsPath = data.OriginalOutputPath / TEXT("app/src/main/res/values/strings.xml");
     EditorUtilities::ReplaceInFile(stringsPath, TEXT("${ProjectName}"), gameSettings->ProductName);
@@ -280,17 +305,25 @@ bool AndroidPlatformTools::OnPostProcess(CookingData& data)
     const Char* gradlew = TEXT("gradlew");
 #endif
 #if PLATFORM_LINUX
-    Platform::RunProcess(String::Format(TEXT("chmod +x \"{0}/gradlew\""), data.OriginalOutputPath), data.OriginalOutputPath, Dictionary<String, String>(), true);
+    {
+        CreateProcessSettings procSettings;
+        procSettings.FileName = String::Format(TEXT("chmod +x \"{0}/gradlew\""), data.OriginalOutputPath);
+        procSettings.WorkingDirectory = data.OriginalOutputPath;
+        procSettings.HiddenWindow = true;
+        Platform::CreateProcess(procSettings);
+    }
 #endif
     const bool distributionPackage = buildSettings->ForDistribution;
-    CreateProcessSettings procSettings;
-    procSettings.FileName = String::Format(TEXT("\"{0}\" {1}"), data.OriginalOutputPath / gradlew, distributionPackage ? TEXT("assemble") : TEXT("assembleDebug"));
-    procSettings.WorkingDirectory = data.OriginalOutputPath;
-    const int32 result = Platform::CreateProcess(procSettings);
-    if (result != 0)
     {
-        data.Error(String::Format(TEXT("Failed to build Gradle project into package (result code: {0}). See log for more info."), result));
-        return true;
+        CreateProcessSettings procSettings;
+        procSettings.FileName = String::Format(TEXT("\"{0}\" {1}"), data.OriginalOutputPath / gradlew, distributionPackage ? TEXT("assemble") : TEXT("assembleDebug"));
+        procSettings.WorkingDirectory = data.OriginalOutputPath;
+        const int32 result = Platform::CreateProcess(procSettings);
+        if (result != 0)
+        {
+            data.Error(String::Format(TEXT("Failed to build Gradle project into package (result code: {0}). See log for more info."), result));
+            return true;
+        }
     }
 
     // Copy result package

Source/Editor/Cooker/Platform/Linux/LinuxPlatformTools.cpp

@@ -104,4 +104,19 @@ bool LinuxPlatformTools::OnDeployBinaries(CookingData& data)
     return false;
 }
 
+void LinuxPlatformTools::OnRun(CookingData& data, String& executableFile, String& commandLineFormat, String& workingDir)
+{
+    // Pick the first executable file
+    Array<String> files;
+    FileSystem::DirectoryGetFiles(files, data.NativeCodeOutputPath, TEXT("*"), DirectorySearchOption::TopDirectoryOnly);
+    for (auto& file : files)
+    {
+        if (FileSystem::GetExtension(file).IsEmpty())
+        {
+            executableFile = file;
+            break;
+        }
+    }
+}
+
 #endif

Source/Editor/Cooker/Platform/Linux/LinuxPlatformTools.h

@@ -20,6 +20,7 @@ public:
     ArchitectureType GetArchitecture() const override;
     bool UseSystemDotnet() const override;
     bool OnDeployBinaries(CookingData& data) override;
+    void OnRun(CookingData& data, String& executableFile, String& commandLineFormat, String& workingDir) override;
 };
 
 #endif

Source/Editor/Cooker/Platform/Mac/MacPlatformTools.cpp

@@ -249,4 +249,19 @@ bool MacPlatformTools::OnPostProcess(CookingData& data)
     return false;
 }
 
+void MacPlatformTools::OnRun(CookingData& data, String& executableFile, String& commandLineFormat, String& workingDir)
+{
+    // Pick the first executable file
+    Array<String> files;
+    FileSystem::DirectoryGetFiles(files, data.NativeCodeOutputPath, TEXT("*"), DirectorySearchOption::TopDirectoryOnly);
+    for (auto& file : files)
+    {
+        if (FileSystem::GetExtension(file).IsEmpty())
+        {
+            executableFile = file;
+            break;
+        }
+    }
+}
+
 #endif

Source/Editor/Cooker/Platform/Mac/MacPlatformTools.h

@@ -27,6 +27,7 @@ public:
     bool IsNativeCodeFile(CookingData& data, const String& file) override;
     void OnBuildStarted(CookingData& data) override;
     bool OnPostProcess(CookingData& data) override;
+    void OnRun(CookingData& data, String& executableFile, String& commandLineFormat, String& workingDir) override;
 };
 
 #endif

Source/Editor/Cooker/Steps/CompileScriptsStep.cpp

@@ -188,8 +188,8 @@ bool CompileScriptsStep::Perform(CookingData& data)
     LOG(Info, "Starting scripts compilation for game...");
     const String logFile = data.CacheDirectory / TEXT("CompileLog.txt");
     auto args = String::Format(
-        TEXT("-log -logfile=\"{4}\" -build -mutex -buildtargets={0} -platform={1} -arch={2} -configuration={3} -aotMode={5}"),
-        target, platform, architecture, configuration, logFile, ToString(data.Tools->UseAOT()));
+        TEXT("-log -logfile=\"{4}\" -build -mutex -buildtargets={0} -platform={1} -arch={2} -configuration={3} -aotMode={5} {6}"),
+        target, platform, architecture, configuration, logFile, ToString(data.Tools->UseAOT()), GAME_BUILD_DOTNET_VER);
 #if PLATFORM_WINDOWS
     if (data.Platform == BuildPlatform::LinuxX64)
 #elif PLATFORM_LINUX

Source/Editor/Cooker/Steps/CookAssetsStep.cpp

@@ -1270,7 +1270,7 @@ bool CookAssetsStep::Perform(CookingData& data)
     {
         Array<CookingData::AssetTypeStatistics> assetTypes;
         data.Stats.AssetStats.GetValues(assetTypes);
-        Sorting::QuickSort(assetTypes.Get(), assetTypes.Count());
+        Sorting::QuickSort(assetTypes);
 
         LOG(Info, "");
         LOG(Info, "Top assets types stats:");

Source/Editor/Cooker/Steps/DeployDataStep.cpp

@@ -48,21 +48,21 @@ bool DeployDataStep::Perform(CookingData& data)
     }
     if (buildSettings.SkipDotnetPackaging && data.Tools->UseSystemDotnet())
     {
-        // Use system-installed .Net Runtime
+        // Use system-installed .NET Runtime
         FileSystem::DeleteDirectory(dstDotnet);
     }
     else
     {
-        // Deploy .Net Runtime files
+        // Deploy .NET Runtime files
         FileSystem::CreateDirectory(dstDotnet);
         String srcDotnet = depsRoot / TEXT("Dotnet");
         if (FileSystem::DirectoryExists(srcDotnet))
         {
-            // Use prebuilt .Net installation for that platform
-            LOG(Info, "Using .Net Runtime {} at {}", data.Tools->GetName(), srcDotnet);
+            // Use prebuilt .NET installation for that platform
+            LOG(Info, "Using .NET Runtime {} at {}", data.Tools->GetName(), srcDotnet);
             if (EditorUtilities::CopyDirectoryIfNewer(dstDotnet, srcDotnet, true))
             {
-                data.Error(TEXT("Failed to copy .Net runtime data files."));
+                data.Error(TEXT("Failed to copy .NET runtime data files."));
                 return true;
             }
         }
@@ -85,9 +85,9 @@ bool DeployDataStep::Perform(CookingData& data)
             }
             if (canUseSystemDotnet && (aotMode == DotNetAOTModes::None || aotMode == DotNetAOTModes::ILC))
             {
-                // Ask Flax.Build to provide .Net SDK location for the current platform
+                // Ask Flax.Build to provide .NET SDK location for the current platform
                 String sdks;
-                bool failed = ScriptsBuilder::RunBuildTool(TEXT("-log -logMessagesOnly -logFileWithConsole -logfile=SDKs.txt -printSDKs"), data.CacheDirectory);
+                bool failed = ScriptsBuilder::RunBuildTool(String::Format(TEXT("-log -logMessagesOnly -logFileWithConsole -logfile=SDKs.txt -printSDKs {}"), GAME_BUILD_DOTNET_VER), data.CacheDirectory);
                 failed |= File::ReadAllText(data.CacheDirectory / TEXT("SDKs.txt"), sdks);
                 int32 idx = sdks.Find(TEXT("DotNetSdk, "), StringSearchCase::CaseSensitive);
                 if (idx != -1)
@@ -101,7 +101,7 @@ bool DeployDataStep::Perform(CookingData& data)
                 }
                 if (failed || !FileSystem::DirectoryExists(srcDotnet))
                 {
-                    data.Error(TEXT("Failed to get .Net SDK location for a current platform."));
+                    data.Error(TEXT("Failed to get .NET SDK location for the current host platform."));
                     return true;
                 }
 
@@ -110,19 +110,25 @@ bool DeployDataStep::Perform(CookingData& data)
                 FileSystem::GetChildDirectories(versions, srcDotnet / TEXT("host/fxr"));
                 if (versions.Count() == 0)
                 {
-                    data.Error(TEXT("Failed to get .Net SDK location for a current platform."));
+                    data.Error(TEXT("Failed to find any .NET hostfxr versions for the current host platform."));
                     return true;
                 }
                 for (String& version : versions)
                 {
                     version = String(StringUtils::GetFileName(version));
-                    if (!version.StartsWith(TEXT("7.")))
+                    if (!version.StartsWith(TEXT("7.")) && !version.StartsWith(TEXT("8."))) // .NET 7 or .NET 8
                         version.Clear();
                 }
-                Sorting::QuickSort(versions.Get(), versions.Count());
+                Sorting::QuickSort(versions);
                 const String version = versions.Last();
+                if (version.IsEmpty())
+                {
+                    data.Error(TEXT("Failed to find supported .NET hostfxr version for the current host platform."));
+                    return true;
+                }
+
                 FileSystem::NormalizePath(srcDotnet);
-                LOG(Info, "Using .Net Runtime {} at {}", version, srcDotnet);
+                LOG(Info, "Using .NET Runtime {} at {}", version, srcDotnet);
 
                 // Check if previously deployed files are valid (eg. system-installed .NET was updated from version 7.0.3 to 7.0.5)
                 {
@@ -131,7 +137,8 @@ bool DeployDataStep::Perform(CookingData& data)
                     if (FileSystem::DirectoryExists(dstDotnet))
                     {
                         String cachedData;
-                        File::ReadAllText(dotnetCacheFilePath, cachedData);
+                        if (FileSystem::FileExists(dotnetCacheFilePath))
+                            File::ReadAllText(dotnetCacheFilePath, cachedData);
                         if (cachedData != dotnetCachedValue)
                         {
                             FileSystem::DeleteDirectory(dstDotnet);
@@ -157,17 +164,17 @@ bool DeployDataStep::Perform(CookingData& data)
                 }
                 if (failed)
                 {
-                    data.Error(TEXT("Failed to copy .Net runtime data files."));
+                    data.Error(TEXT("Failed to copy .NET runtime data files."));
                     return true;
                 }
             }
             else
             {
-                // Ask Flax.Build to provide .Net Host Runtime location for the target platform
+                // Ask Flax.Build to provide .NET Host Runtime location for the target platform
                 String sdks;
                 const Char *platformName, *archName;
                 data.GetBuildPlatformName(platformName, archName);
-                String args = String::Format(TEXT("-log -logMessagesOnly -logFileWithConsole -logfile=SDKs.txt -printDotNetRuntime -platform={} -arch={}"), platformName, archName);
+                String args = String::Format(TEXT("-log -logMessagesOnly -logFileWithConsole -logfile=SDKs.txt -printDotNetRuntime -platform={} -arch={} {}"), platformName, archName, GAME_BUILD_DOTNET_VER);
                 bool failed = ScriptsBuilder::RunBuildTool(args, data.CacheDirectory);
                 failed |= File::ReadAllText(data.CacheDirectory / TEXT("SDKs.txt"), sdks);
                 Array<String> parts;
@@ -179,11 +186,11 @@ bool DeployDataStep::Perform(CookingData& data)
                 }
                 if (failed || !FileSystem::DirectoryExists(srcDotnet))
                 {
-                    data.Error(TEXT("Failed to get .Net SDK location for a current platform."));
+                    data.Error(TEXT("Failed to get .NET SDK location for the current host platform."));
                     return true;
                 }
                 FileSystem::NormalizePath(srcDotnet);
-                LOG(Info, "Using .Net Runtime {} at {}", TEXT("Host"), srcDotnet);
+                LOG(Info, "Using .NET Runtime {} at {}", TEXT("Host"), srcDotnet);
 
                 // Deploy runtime files
                 const Char* corlibPrivateName = TEXT("System.Private.CoreLib.dll");
@@ -248,7 +255,7 @@ bool DeployDataStep::Perform(CookingData& data)
                     DEPLOY_NATIVE_FILE("libmonosgen-2.0.dylib");
                     DEPLOY_NATIVE_FILE("libSystem.IO.Compression.Native.dylib");
                     DEPLOY_NATIVE_FILE("libSystem.Native.dylib");
-                    DEPLOY_NATIVE_FILE("libSystem.Net.Security.Native.dylib");
+                    DEPLOY_NATIVE_FILE("libSystem.NET.Security.Native.dylib");
                     DEPLOY_NATIVE_FILE("libSystem.Security.Cryptography.Native.Apple.dylib");
                     break;
 #undef DEPLOY_NATIVE_FILE
@@ -256,7 +263,7 @@ bool DeployDataStep::Perform(CookingData& data)
                 }
                 if (failed)
                 {
-                    data.Error(TEXT("Failed to copy .Net runtime data files."));
+                    data.Error(TEXT("Failed to copy .NET runtime data files."));
                     return true;
                 }
             }
@@ -268,8 +275,8 @@ bool DeployDataStep::Perform(CookingData& data)
             LOG(Info, "Optimizing .NET class library size to include only used assemblies");
             const String logFile = data.CacheDirectory / TEXT("StripDotnetLibs.txt");
             String args = String::Format(
-                TEXT("-log -logfile=\"{}\" -runDotNetClassLibStripping -mutex -binaries=\"{}\""),
-                logFile, data.DataOutputPath);
+                TEXT("-log -logfile=\"{}\" -runDotNetClassLibStripping -mutex -binaries=\"{}\" {}"),
+                logFile, data.DataOutputPath, GAME_BUILD_DOTNET_VER);
             for (const String& define : data.CustomDefines)
             {
                 args += TEXT(" -D");
@@ -277,7 +284,7 @@ bool DeployDataStep::Perform(CookingData& data)
             }
             if (ScriptsBuilder::RunBuildTool(args))
             {
-                data.Error(TEXT("Failed to optimize .Net class library."));
+                data.Error(TEXT("Failed to optimize .NET class library."));
                 return true;
             }
         }

Source/Editor/Cooker/Steps/PrecompileAssembliesStep.cpp

@@ -67,8 +67,8 @@ bool PrecompileAssembliesStep::Perform(CookingData& data)
     data.GetBuildPlatformName(platform, architecture);
     const String logFile = data.CacheDirectory / TEXT("AOTLog.txt");
     String args = String::Format(
-        TEXT("-log -logfile=\"{}\" -runDotNetAOT -mutex -platform={} -arch={} -configuration={} -aotMode={} -binaries=\"{}\" -intermediate=\"{}\""),
-        logFile, platform, architecture, configuration, ToString(aotMode), data.DataOutputPath, data.ManagedCodeOutputPath);
+        TEXT("-log -logfile=\"{}\" -runDotNetAOT -mutex -platform={} -arch={} -configuration={} -aotMode={} -binaries=\"{}\" -intermediate=\"{}\" {}"),
+        logFile, platform, architecture, configuration, ToString(aotMode), data.DataOutputPath, data.ManagedCodeOutputPath, GAME_BUILD_DOTNET_VER);
     if (!buildSettings.SkipUnusedDotnetLibsPackaging)
         args += TEXT(" -skipUnusedDotnetLibs=false"); // Run AOT on whole class library (not just used libs)
     for (const String& define : data.CustomDefines)

Source/Editor/CustomEditorWindow.cs

@@ -1,9 +1,9 @@
 // Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
 
 using FlaxEditor.CustomEditors;
+using FlaxEditor.GUI.Docking;
 using FlaxEditor.Windows;
 using FlaxEngine.GUI;
-using DockState = FlaxEditor.GUI.Docking.DockState;
 
 namespace FlaxEditor
 {
@@ -97,9 +97,12 @@ namespace FlaxEditor
         /// Shows the window.
         /// </summary>
         /// <param name="state">Initial window state.</param>
-        public void Show(DockState state = DockState.Float)
+        /// <param name="toDock">The panel to dock to, if any.</param>
+        /// <param name="autoSelect">Only used if <paramref name="toDock"/> is set. If true the window will be selected after docking it.</param>
+        /// <param name="splitterValue">The splitter value to use if toDock is not null. If not specified, a default value will be used.</param>
+        public void Show(DockState state = DockState.Float, DockPanel toDock = null, bool autoSelect = true, float? splitterValue = null)
         {
-            _win.Show(state);
+            _win.Show(state, toDock, autoSelect, splitterValue);
         }
     }
 }

Source/Editor/CustomEditors/CustomEditor.cs

@@ -7,9 +7,8 @@ using FlaxEditor.CustomEditors.GUI;
 using FlaxEditor.Scripting;
 using FlaxEngine;
 using FlaxEngine.GUI;
+using FlaxEngine.Json;
 using FlaxEngine.Utilities;
-using Newtonsoft.Json;
-using JsonSerializer = FlaxEngine.Json.JsonSerializer;
 
 namespace FlaxEditor.CustomEditors
 {
@@ -157,6 +156,12 @@ namespace FlaxEditor.CustomEditors
             var values = _values;
             var presenter = _presenter;
             var layout = _layout;
+            if (layout.Editors.Count > 1)
+            {
+                // There are more editors using the same layout so rebuild parent editor to prevent removing others editors
+                _parent?.RebuildLayout();
+                return;
+            }
             var control = layout.ContainerControl;
             var parent = _parent;
             var parentScrollV = (_presenter?.Panel.Parent as Panel)?.VScrollBar?.Value ?? -1;
@@ -380,22 +385,22 @@ namespace FlaxEditor.CustomEditors
             LinkedLabel = label;
         }
 
-        private void RevertDiffToDefault(CustomEditor editor)
-        {
-            if (editor.ChildrenEditors.Count == 0)
-            {
-                // Skip if no change detected
-                if (!editor.Values.IsDefaultValueModified)
-                    return;
+        /// <summary>
+        /// If true, the value reverting to default/reference will be handled via iteration over children editors, instead of for a whole object at once.
+        /// </summary>
+        public virtual bool RevertValueWithChildren => ChildrenEditors.Count != 0;
 
-                editor.SetValueToDefault();
+        private void RevertDiffToDefault()
+        {
+            if (RevertValueWithChildren)
+            {
+                foreach (var child in ChildrenEditors)
+                    child.RevertDiffToDefault();
             }
             else
             {
-                for (int i = 0; i < editor.ChildrenEditors.Count; i++)
-                {
-                    RevertDiffToDefault(editor.ChildrenEditors[i]);
-                }
+                if (Values.IsDefaultValueModified)
+                    SetValueToDefault();
             }
         }
 
@@ -408,11 +413,6 @@ namespace FlaxEditor.CustomEditors
             {
                 if (!Values.IsDefaultValueModified)
                     return false;
-
-                // Skip array items (show diff only on a bottom level properties and fields)
-                if (ParentEditor is Editors.ArrayEditor)
-                    return false;
-
                 return true;
             }
         }
@@ -424,7 +424,7 @@ namespace FlaxEditor.CustomEditors
         {
             if (!Values.HasDefaultValue)
                 return;
-            RevertDiffToDefault(this);
+            RevertDiffToDefault();
         }
 
         /// <summary>
@@ -462,22 +462,17 @@ namespace FlaxEditor.CustomEditors
             }
         }
 
-        private void RevertDiffToReference(CustomEditor editor)
+        private void RevertDiffToReference()
         {
-            if (editor.ChildrenEditors.Count == 0)
+            if (RevertValueWithChildren)
             {
-                // Skip if no change detected
-                if (!editor.Values.IsReferenceValueModified)
-                    return;
-
-                editor.SetValueToReference();
+                foreach (var child in ChildrenEditors)
+                    child.RevertDiffToReference();
             }
             else
             {
-                for (int i = 0; i < editor.ChildrenEditors.Count; i++)
-                {
-                    RevertDiffToReference(editor.ChildrenEditors[i]);
-                }
+                if (Values.IsReferenceValueModified)
+                    SetValueToReference();
             }
         }
 
@@ -490,11 +485,6 @@ namespace FlaxEditor.CustomEditors
             {
                 if (!Values.IsReferenceValueModified)
                     return false;
-
-                // Skip array items (show diff only on a bottom level properties and fields)
-                if (ParentEditor is Editors.ArrayEditor)
-                    return false;
-
                 return true;
             }
         }
@@ -506,7 +496,7 @@ namespace FlaxEditor.CustomEditors
         {
             if (!Values.HasReferenceValue)
                 return;
-            RevertDiffToReference(this);
+            RevertDiffToReference();
         }
 
         /// <summary>
@@ -651,7 +641,7 @@ namespace FlaxEditor.CustomEditors
                 // Default
                 try
                 {
-                    obj = JsonConvert.DeserializeObject(text, TypeUtils.GetType(Values.Type), JsonSerializer.Settings);
+                    obj = Newtonsoft.Json.JsonConvert.DeserializeObject(text, TypeUtils.GetType(Values.Type), JsonSerializer.Settings);
                 }
                 catch
                 {
@@ -756,7 +746,7 @@ namespace FlaxEditor.CustomEditors
         /// </summary>
         public void SetValueToDefault()
         {
-            SetValue(Values.DefaultValue);
+            SetValueCloned(Values.DefaultValue);
         }
 
         /// <summary>
@@ -793,7 +783,19 @@ namespace FlaxEditor.CustomEditors
                 return;
             }
 
-            SetValue(Values.ReferenceValue);
+            SetValueCloned(Values.ReferenceValue);
+        }
+
+        private void SetValueCloned(object value)
+        {
+            // For objects (eg. arrays) we need to clone them to prevent editing default/reference value within editor
+            if (value != null && !value.GetType().IsValueType)
+            {
+                var json = JsonSerializer.Serialize(value);
+                value = JsonSerializer.Deserialize(json, value.GetType());
+            }
+
+            SetValue(value);
         }
 
         /// <summary>
@@ -805,7 +807,6 @@ namespace FlaxEditor.CustomEditors
         {
             if (_isSetBlocked)
                 return;
-
             if (OnDirty(this, value, token))
             {
                 _hasValueDirty = true;

Source/Editor/CustomEditors/Dedicated/MeshReferenceEditor.cs

@@ -225,8 +225,15 @@ namespace FlaxEditor.CustomEditors.Dedicated
             }
             _actor = actor;
 
-            var showActorPicker = actor == null || ParentEditor.Values.All(x => x is not Cloth);
-            if (showActorPicker)
+            if (ParentEditor.Values.Any(x => x is Cloth))
+            {
+                // Cloth always picks the parent model mesh
+                if (actor == null)
+                {
+                    layout.Label("Cloth needs to be added as a child to model actor.");
+                }
+            }
+            else
             {
                 // Actor reference picker
                 _actorPicker = layout.Custom<FlaxObjectRefPickerControl>();
@@ -242,7 +249,10 @@ namespace FlaxEditor.CustomEditors.Dedicated
                 {
                     var model = staticModel.Model;
                     if (model == null || model.WaitForLoaded())
+                    {
+                        layout.Label("No model.");
                         return;
+                    }
                     var materials = model.MaterialSlots;
                     var lods = model.LODs;
                     meshNames = new string[lods.Length][];
@@ -267,7 +277,10 @@ namespace FlaxEditor.CustomEditors.Dedicated
                 {
                     var skinnedModel = animatedModel.SkinnedModel;
                     if (skinnedModel == null || skinnedModel.WaitForLoaded())
+                    {
+                        layout.Label("No model.");
                         return;
+                    }
                     var materials = skinnedModel.MaterialSlots;
                     var lods = skinnedModel.LODs;
                     meshNames = new string[lods.Length][];

Source/Editor/CustomEditors/Dedicated/MissingScriptEditor.cs

@@ -1,6 +1,13 @@
-using FlaxEditor.CustomEditors.Editors;
+// Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
+
+using FlaxEditor.Actions;
+using FlaxEditor.CustomEditors.Editors;
+using FlaxEditor.GUI;
+using FlaxEditor.GUI.ContextMenu;
+using FlaxEditor.Scripting;
 using FlaxEngine;
 using FlaxEngine.GUI;
+using System.Collections.Generic;
 
 namespace FlaxEditor.CustomEditors.Dedicated;
 
@@ -10,6 +17,10 @@ namespace FlaxEditor.CustomEditors.Dedicated;
 [CustomEditor(typeof(MissingScript)), DefaultEditor]
 public class MissingScriptEditor : GenericEditor
 {
+    private DropPanel _dropPanel;
+    private Button _replaceScriptButton;
+    private CheckBox _shouldReplaceAllCheckbox;
+
     /// <inheritdoc />
     public override void Initialize(LayoutElementsContainer layout)
     {
@@ -18,9 +29,128 @@ public class MissingScriptEditor : GenericEditor
             base.Initialize(layout);
             return;
         }
+        _dropPanel = dropPanel;
+        _dropPanel.HeaderTextColor = Color.OrangeRed;
 
-        dropPanel.HeaderTextColor = Color.OrangeRed;
+        var replaceScriptPanel = new Panel
+        {
+            Parent = _dropPanel,
+            Height = 64,
+        };
+        _replaceScriptButton = new Button
+        {
+            Text = "Replace Script",
+            TooltipText = "Replaces the missing script with a given script type",
+            AnchorPreset = AnchorPresets.TopCenter,
+            Bounds = new Rectangle(-120, 0, 240, 24),
+            Parent = replaceScriptPanel,
+        };
+        _replaceScriptButton.Clicked += OnReplaceScriptButtonClicked;
+        var replaceAllLabel = new Label
+        {
+            Text = "Replace all matching missing scripts",
+            TooltipText = "Whether or not to apply this script change to all scripts missing the same type.",
+            AnchorPreset = AnchorPresets.BottomCenter,
+            Y = -38,
+            Parent = replaceScriptPanel,
+        };
+        _shouldReplaceAllCheckbox = new CheckBox
+        {
+            TooltipText = replaceAllLabel.TooltipText,
+            AnchorPreset = AnchorPresets.BottomCenter,
+            Y = -38,
+            Parent = replaceScriptPanel,
+        };
+        _shouldReplaceAllCheckbox.X -= _replaceScriptButton.Width * 0.5f + 0.5f;
+        replaceAllLabel.X -= 52;
 
         base.Initialize(layout);
     }
+
+    private void FindActorsWithMatchingMissingScript(List<MissingScript> missingScripts)
+    {
+        foreach (Actor actor in Level.GetActors(typeof(Actor)))
+        {
+            for (int scriptIndex = 0; scriptIndex < actor.ScriptsCount; scriptIndex++)
+            {
+                Script actorScript = actor.Scripts[scriptIndex];
+                if (actorScript is not MissingScript missingActorScript)
+                    continue;
+
+                MissingScript currentMissing = Values[0] as MissingScript;
+                if (missingActorScript.MissingTypeName != currentMissing.MissingTypeName)
+                    continue;
+
+                missingScripts.Add(missingActorScript);
+            }
+        }
+    }
+
+    private void RunReplacementMultiCast(List<IUndoAction> actions)
+    {
+        if (actions.Count == 0)
+        {
+            Editor.LogWarning("Failed to replace scripts!");
+            return;
+        }
+
+        var multiAction = new MultiUndoAction(actions);
+        multiAction.Do();
+        var presenter = ParentEditor.Presenter;
+        if (presenter != null)
+        {
+            presenter.Undo.AddAction(multiAction);
+            presenter.Control.Focus();
+        }
+    }
+
+    private void ReplaceScript(ScriptType script, bool replaceAllInScene)
+    {
+        var actions = new List<IUndoAction>(4);
+
+        var missingScripts = new List<MissingScript>();
+        if (!replaceAllInScene)
+            missingScripts.Add((MissingScript)Values[0]);
+        else
+            FindActorsWithMatchingMissingScript(missingScripts);
+
+        foreach (var missingScript in missingScripts)
+            actions.Add(AddRemoveScript.Add(missingScript.Actor, script));
+        RunReplacementMultiCast(actions);
+
+        for (int actionIdx = 0; actionIdx < actions.Count; actionIdx++)
+        {
+            AddRemoveScript addRemoveScriptAction = (AddRemoveScript)actions[actionIdx];
+            int orderInParent = addRemoveScriptAction.GetOrderInParent();
+
+            Script newScript = missingScripts[actionIdx].Actor.Scripts[orderInParent];
+            missingScripts[actionIdx].ReferenceScript = newScript;
+        }
+        actions.Clear();
+
+        foreach (var missingScript in missingScripts)
+            actions.Add(AddRemoveScript.Remove(missingScript));
+        RunReplacementMultiCast(actions);
+    }
+
+    private void OnReplaceScriptButtonClicked()
+    {
+        var scripts = Editor.Instance.CodeEditing.Scripts.Get();
+        if (scripts.Count == 0)
+        {
+            // No scripts
+            var cm1 = new ContextMenu();
+            cm1.AddButton("No scripts in project");
+            cm1.Show(_dropPanel, _replaceScriptButton.BottomLeft);
+            return;
+        }
+
+        // Show context menu with list of scripts to add
+        var cm = new ItemsListContextMenu(180);
+        for (int i = 0; i < scripts.Count; i++)
+            cm.AddItem(new TypeSearchPopup.TypeItemView(scripts[i]));
+        cm.ItemClicked += item => ReplaceScript((ScriptType)item.Tag, _shouldReplaceAllCheckbox.Checked);
+        cm.SortItems();
+        cm.Show(_dropPanel, _replaceScriptButton.BottomLeft - new Float2((cm.Width - _replaceScriptButton.Width) / 2, 0));
+    }
 }

Source/Editor/CustomEditors/Dedicated/ModelPrefabEditor.cs

@@ -0,0 +1,84 @@
+// Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
+
+using System;
+using System.IO;
+using FlaxEditor.Content;
+using FlaxEditor.CustomEditors.Editors;
+using FlaxEngine;
+using FlaxEngine.GUI;
+using FlaxEngine.Tools;
+
+namespace FlaxEditor.CustomEditors.Dedicated;
+
+/// <summary>
+/// The missing script editor.
+/// </summary>
+[CustomEditor(typeof(ModelPrefab)), DefaultEditor]
+public class ModelPrefabEditor : GenericEditor
+{
+    private Guid _prefabId;
+    private Button _reimportButton;
+    private string _importPath;
+
+    /// <inheritdoc />
+    public override void Initialize(LayoutElementsContainer layout)
+    {
+        base.Initialize(layout);
+
+        var modelPrefab = Values[0] as ModelPrefab;
+        if (modelPrefab == null)
+            return;
+        _prefabId = modelPrefab.PrefabID;
+        while (true)
+        {
+            if (_prefabId == Guid.Empty)
+            {
+                break;
+            }
+
+            var prefab = FlaxEngine.Content.Load<Prefab>(_prefabId);
+            if (prefab)
+            {
+                var prefabObjectId = modelPrefab.PrefabObjectID;
+                var prefabObject = prefab.GetDefaultInstance(ref prefabObjectId);
+                if (prefabObject.PrefabID == _prefabId)
+                    break;
+                _prefabId = prefabObject.PrefabID;
+            }
+        }
+
+        var button = layout.Button("Reimport", "Reimports the source asset as prefab.");
+        _reimportButton = button.Button;
+        _reimportButton.Clicked += OnReimport;
+    }
+
+    private void OnReimport()
+    {
+        var prefab = FlaxEngine.Content.Load<Prefab>(_prefabId);
+        var modelPrefab = (ModelPrefab)Values[0];
+        var importPath = modelPrefab.ImportPath;
+        var editor = Editor.Instance;
+        if (editor.ContentImporting.GetReimportPath("Model Prefab", ref importPath))
+            return;
+        var folder = editor.ContentDatabase.Find(Path.GetDirectoryName(prefab.Path)) as ContentFolder;
+        if (folder == null)
+            return;
+        var importOptions = modelPrefab.ImportOptions;
+        importOptions.Type = ModelTool.ModelType.Prefab;
+        _importPath = importPath;
+        _reimportButton.Enabled = false;
+        editor.ContentImporting.ImportFileEnd += OnImportFileEnd;
+        editor.ContentImporting.Import(importPath, folder, true, importOptions);
+    }
+
+    private void OnImportFileEnd(IFileEntryAction entry, bool failed)
+    {
+        if (entry.SourceUrl == _importPath)
+        {
+            // Restore button
+            _importPath = null;
+            _reimportButton.Enabled = true;
+            Editor.Instance.ContentImporting.ImportFileEnd -= OnImportFileEnd;
+        }
+    }
+}

Source/Editor/CustomEditors/Dedicated/ScriptsEditor.cs

@@ -246,6 +246,7 @@ namespace FlaxEditor.CustomEditors.Dedicated
             var multiAction = new MultiUndoAction(actions);
             multiAction.Do();
             var presenter = ScriptsEditor.Presenter;
+            ScriptsEditor.ParentEditor?.RebuildLayout();
             if (presenter != null)
             {
                 presenter.Undo.AddAction(multiAction);

Source/Editor/CustomEditors/Dedicated/UIControlEditor.cs

@@ -695,7 +695,41 @@ namespace FlaxEditor.CustomEditors.Dedicated
         private void SetType(ref ScriptType controlType, UIControl uiControl)
         {
             string previousName = uiControl.Control?.GetType().Name ?? nameof(UIControl);
-            uiControl.Control = (Control)controlType.CreateInstance();
+
+            var oldControlType = (Control)uiControl.Control;
+            var newControlType = (Control)controlType.CreateInstance();
+
+            // copy old control data to new control
+            if (oldControlType != null)
+            {
+                newControlType.Visible = oldControlType.Visible;
+                newControlType.Enabled = oldControlType.Enabled;
+                newControlType.AutoFocus = oldControlType.AutoFocus;
+
+                newControlType.AnchorMin = oldControlType.AnchorMin;
+                newControlType.AnchorMax = oldControlType.AnchorMax;
+                newControlType.Offsets = oldControlType.Offsets;
+
+                newControlType.LocalLocation = oldControlType.LocalLocation;
+                newControlType.Scale = oldControlType.Scale;
+                newControlType.Bounds = oldControlType.Bounds;
+                newControlType.Width = oldControlType.Width;
+                newControlType.Height = oldControlType.Height;
+                newControlType.Center = oldControlType.Center;
+                newControlType.PivotRelative = oldControlType.PivotRelative;
+
+                newControlType.Pivot = oldControlType.Pivot;
+                newControlType.Shear = oldControlType.Shear;
+                newControlType.Rotation = oldControlType.Rotation;
+            }
+            if (oldControlType is ContainerControl oldContainer && newControlType is ContainerControl newContainer)
+            {
+                newContainer.CullChildren = oldContainer.CullChildren;
+                newContainer.ClipChildren = oldContainer.ClipChildren;
+            }
+
+            uiControl.Control = newControlType;
+
             if (uiControl.Name.StartsWith(previousName))
             {
                 string newName = controlType.Name + uiControl.Name.Substring(previousName.Length);

Source/Editor/CustomEditors/Editors/ActorLayerEditor.cs

@@ -34,7 +34,7 @@ namespace FlaxEditor.CustomEditors.Editors
                 value = 0;
 
             // If selected is single actor that has children, ask if apply layer to the sub objects as well
-            if (Values.IsSingleObject && (int)Values[0] != value && ParentEditor.Values[0] is Actor actor && actor.HasChildren)
+            if (Values.IsSingleObject && (int)Values[0] != value && ParentEditor.Values[0] is Actor actor && actor.HasChildren && !Editor.IsPlayMode)
             {
                 var valueText = comboBox.SelectedItem;
 

Source/Editor/CustomEditors/Editors/AssetRefEditor.cs

@@ -71,7 +71,7 @@ namespace FlaxEditor.CustomEditors.Editors
                 {
                     // Generic file picker
                     assetType = ScriptType.Null;
-                    Picker.FileExtension = assetReference.TypeName;
+                    Picker.Validator.FileExtension = assetReference.TypeName;
                 }
                 else
                 {
@@ -85,7 +85,7 @@ namespace FlaxEditor.CustomEditors.Editors
                 }
             }
 
-            Picker.AssetType = assetType;
+            Picker.Validator.AssetType = assetType;
             Picker.Height = height;
             Picker.SelectedItemChanged += OnSelectedItemChanged;
         }
@@ -95,15 +95,15 @@ namespace FlaxEditor.CustomEditors.Editors
             if (_isRefreshing)
                 return;
             if (typeof(AssetItem).IsAssignableFrom(_valueType.Type))
-                SetValue(Picker.SelectedItem);
+                SetValue(Picker.Validator.SelectedItem);
             else if (_valueType.Type == typeof(Guid))
-                SetValue(Picker.SelectedID);
+                SetValue(Picker.Validator.SelectedID);
             else if (_valueType.Type == typeof(SceneReference))
-                SetValue(new SceneReference(Picker.SelectedID));
+                SetValue(new SceneReference(Picker.Validator.SelectedID));
             else if (_valueType.Type == typeof(string))
-                SetValue(Picker.SelectedPath);
+                SetValue(Picker.Validator.SelectedPath);
             else
-                SetValue(Picker.SelectedAsset);
+                SetValue(Picker.Validator.SelectedAsset);
         }
 
         /// <inheritdoc />
@@ -115,15 +115,15 @@ namespace FlaxEditor.CustomEditors.Editors
             {
                 _isRefreshing = true;
                 if (Values[0] is AssetItem assetItem)
-                    Picker.SelectedItem = assetItem;
+                    Picker.Validator.SelectedItem = assetItem;
                 else if (Values[0] is Guid guid)
-                    Picker.SelectedID = guid;
+                    Picker.Validator.SelectedID = guid;
                 else if (Values[0] is SceneReference sceneAsset)
-                    Picker.SelectedItem = Editor.Instance.ContentDatabase.FindAsset(sceneAsset.ID);
+                    Picker.Validator.SelectedItem = Editor.Instance.ContentDatabase.FindAsset(sceneAsset.ID);
                 else if (Values[0] is string path)
-                    Picker.SelectedPath = path;
+                    Picker.Validator.SelectedPath = path;
                 else
-                    Picker.SelectedAsset = Values[0] as Asset;
+                    Picker.Validator.SelectedAsset = Values[0] as Asset;
                 _isRefreshing = false;
             }
         }

Source/Editor/CustomEditors/Editors/BehaviorKnowledgeSelectorEditor.cs

@@ -171,11 +171,13 @@ namespace FlaxEditor.CustomEditors.Editors
                 tree.Select(typeNode);
             if (addItems)
             {
-                var items = GenericEditor.GetItemsForType(type, type.IsClass, true);
+                var items = GenericEditor.GetItemsForType(type, type.IsClass, true, true);
                 foreach (var item in items)
                 {
                     if (typed && !typed.IsAssignableFrom(item.Info.ValueType))
                         continue;
+                    if (item.Info.DeclaringType.Type == typeof(FlaxEngine.Object))
+                        continue; // Skip engine internals
                     var itemPath = typePath + item.Info.Name;
                     var node = new TreeNode
                     {

Source/Editor/CustomEditors/Editors/CollectionEditor.cs

@@ -4,8 +4,11 @@ using System;
 using System.Collections;
 using System.Linq;
 using FlaxEditor.CustomEditors.GUI;
-using FlaxEditor.GUI.ContextMenu;
 using FlaxEditor.GUI.Input;
+using FlaxEditor.Content;
+using FlaxEditor.GUI.ContextMenu;
+using FlaxEditor.GUI.Drag;
+using FlaxEditor.SceneGraph;
 using FlaxEditor.Scripting;
 using FlaxEngine;
 using FlaxEngine.GUI;
@@ -34,9 +37,6 @@ namespace FlaxEditor.CustomEditors.Editors
             /// The index of the item (zero-based).
             /// </summary>
             public readonly int Index;
-            
-            private Image _moveUpImage;
-            private Image _moveDownImage;
 
             /// <summary>
             /// Initializes a new instance of the <see cref="CollectionItemLabel"/> class.
@@ -49,48 +49,8 @@ namespace FlaxEditor.CustomEditors.Editors
                 Editor = editor;
                 Index = index;
 
-                var icons = FlaxEditor.Editor.Instance.Icons;
-                var style = FlaxEngine.GUI.Style.Current;
-                var imageSize = 18;
-                _moveDownImage = new Image
-                {
-                    Brush = new SpriteBrush(icons.Down32),
-                    TooltipText = "Move down",
-                    IsScrollable = false,
-                    AnchorPreset = AnchorPresets.MiddleRight,
-                    Bounds = new Rectangle(-imageSize, -Height * 0.5f, imageSize, imageSize),
-                    Color = style.ForegroundGrey,
-                    Margin = new Margin(1),
-                    Parent = this,
-                };
-                _moveDownImage.Clicked += MoveDownImageOnClicked;
-                _moveDownImage.Enabled = Index + 1 < Editor.Count;
-                _moveUpImage = new Image
-                {
-                    Brush = new SpriteBrush(icons.Up32),
-                    TooltipText = "Move up",
-                    IsScrollable = false,
-                    AnchorPreset = AnchorPresets.MiddleRight,
-                    Bounds = new Rectangle(-(imageSize * 2 + 2), -Height * 0.5f, imageSize, imageSize),
-                    Color = style.ForegroundGrey,
-                    Margin = new Margin(1),
-                    Parent = this,
-                };
-                _moveUpImage.Clicked += MoveUpImageOnClicked;
-                _moveUpImage.Enabled = Index > 0;
-
                 SetupContextMenu += OnSetupContextMenu;
             }
-            
-            private void MoveUpImageOnClicked(Image image, MouseButton button)
-            {
-                OnMoveUpClicked();
-            }
-            
-            private void MoveDownImageOnClicked(Image image, MouseButton button)
-            {
-                OnMoveDownClicked();
-            }
 
             private void OnSetupContextMenu(PropertyNameLabel label, ContextMenu menu, CustomEditor linkedEditor)
             {
@@ -144,8 +104,6 @@ namespace FlaxEditor.CustomEditors.Editors
             public CustomEditor LinkedEditor;
 
             private bool _canReorder = true;
-            private Image _moveUpImage;
-            private Image _moveDownImage;
 
             public void Setup(CollectionEditor editor, int index, bool canReorder = true)
             {
@@ -164,48 +122,10 @@ namespace FlaxEditor.CustomEditors.Editors
                 MouseButtonRightClicked += OnMouseButtonRightClicked;
                 if (_canReorder)
                 {
-                    var imageSize = HeaderHeight;
-                    var style = FlaxEngine.GUI.Style.Current;
-                    _moveDownImage = new Image
-                    {
-                        Brush = new SpriteBrush(icons.Down32),
-                        TooltipText = "Move down",
-                        IsScrollable = false,
-                        AnchorPreset = AnchorPresets.TopRight,
-                        Bounds = new Rectangle(-(imageSize + ItemsMargin.Right + 2), -HeaderHeight, imageSize, imageSize),
-                        Color = style.ForegroundGrey,
-                        Margin = new Margin(1),
-                        Parent = this,
-                    };
-                    _moveDownImage.Clicked += MoveDownImageOnClicked;
-                    _moveDownImage.Enabled = Index + 1 < Editor.Count;
-                
-                    _moveUpImage = new Image
-                    {
-                        Brush = new SpriteBrush(icons.Up32),
-                        TooltipText = "Move up",
-                        IsScrollable = false,
-                        AnchorPreset = AnchorPresets.TopRight,
-                        Bounds = new Rectangle(-(imageSize * 2 + ItemsMargin.Right + 2), -HeaderHeight, imageSize, imageSize),
-                        Color = style.ForegroundGrey,
-                        Margin = new Margin(1),
-                        Parent = this,
-                    };
-                    _moveUpImage.Clicked += MoveUpImageOnClicked;
-                    _moveUpImage.Enabled = Index > 0;
+                    // TODO: Drag drop
                 }
             }
 
-            private void MoveUpImageOnClicked(Image image, MouseButton button)
-            {
-                OnMoveUpClicked();
-            }
-            
-            private void MoveDownImageOnClicked(Image image, MouseButton button)
-            {
-                OnMoveDownClicked();
-            }
-
             private void OnMouseButtonRightClicked(DropPanel panel, Float2 location)
             {
                 if (LinkedEditor == null)
@@ -253,7 +173,6 @@ namespace FlaxEditor.CustomEditors.Editors
         /// Determines if value of collection can be null.
         /// </summary>
         protected bool NotNullItems;
-        
         private IntValueBox _sizeBox;
         private Color _background;
         private int _elementsCount;
@@ -278,11 +197,14 @@ namespace FlaxEditor.CustomEditors.Editors
             }
         }
 
+        /// <inheritdoc />
+        public override bool RevertValueWithChildren => false; // Always revert value for a whole collection
+
         /// <inheritdoc />
         public override void Initialize(LayoutElementsContainer layout)
         {
             // No support for different collections for now
-            if (HasDifferentValues || HasDifferentTypes)
+            if (HasDifferentTypes)
                 return;
 
             var size = Count;
@@ -309,6 +231,35 @@ namespace FlaxEditor.CustomEditors.Editors
                 _displayType = collection.Display;
             }
 
+            var dragArea = layout.CustomContainer<DragAreaControl>();
+            dragArea.CustomControl.Editor = this;
+            dragArea.CustomControl.ElementType = ElementType;
+
+            // Check for the AssetReferenceAttribute. In JSON assets, it can be used to filter
+            // which scripts can be dragged over and dropped on this collection editor.
+            var assetReference = (AssetReferenceAttribute)attributes?.FirstOrDefault(x => x is AssetReferenceAttribute);
+            if (assetReference != null)
+            {
+                if (string.IsNullOrEmpty(assetReference.TypeName))
+                {
+                }
+                else if (assetReference.TypeName.Length > 1 && assetReference.TypeName[0] == '.')
+                {
+                    dragArea.CustomControl.ElementType = ScriptType.Null;
+                    dragArea.CustomControl.FileExtension = assetReference.TypeName;
+                }
+                else
+                {
+                    var customType = TypeUtils.GetType(assetReference.TypeName);
+                    if (customType != ScriptType.Null)
+                        dragArea.CustomControl.ElementType = customType;
+                    else if (!Content.Settings.GameSettings.OptionalPlatformSettings.Contains(assetReference.TypeName))
+                        Debug.LogWarning(string.Format("Unknown asset type '{0}' to use for drag and drop filter.", assetReference.TypeName));
+                    else
+                        dragArea.CustomControl.ElementType = ScriptType.Void;
+                }
+            }
+
             // Size
             if (layout.ContainerControl is DropPanel dropPanel)
             {
@@ -345,7 +296,7 @@ namespace FlaxEditor.CustomEditors.Editors
             // Elements
             if (size > 0)
             {
-                var panel = layout.VerticalPanel();
+                var panel = dragArea.VerticalPanel();
                 panel.Panel.Offsets = new Margin(7, 7, 0, 0);
                 panel.Panel.BackgroundColor = _background;
                 var elementType = ElementType;
@@ -360,9 +311,9 @@ namespace FlaxEditor.CustomEditors.Editors
                 for (int i = 0; i < size; i++)
                 {
                     // Apply spacing
-                    if (i > 0 && i < size && spacing > 0)
+                    if (i > 0 && i < size && spacing > 0 && !single)
                         panel.Space(spacing);
-                    
+
                     var overrideEditor = overrideEditorType != null ? (CustomEditor)Activator.CreateInstance(overrideEditorType) : null;
                     if (_displayType == CollectionAttribute.DisplayType.Inline || (collection == null && single) || (_displayType == CollectionAttribute.DisplayType.Default && single))
                     {
@@ -372,7 +323,7 @@ namespace FlaxEditor.CustomEditors.Editors
                         else
                             itemLabel = new PropertyNameLabel("Element " + i);
                         var property = panel.AddPropertyItem(itemLabel);
-                        var itemLayout = property.VerticalPanel();
+                        var itemLayout = (LayoutElementsContainer)property;
                         itemLabel.LinkedEditor = itemLayout.Object(new ListValueContainer(elementType, i, Values, attributes), overrideEditor);
                     }
                     else if (_displayType == CollectionAttribute.DisplayType.Header || (_displayType == CollectionAttribute.DisplayType.Default && !single))
@@ -389,40 +340,44 @@ namespace FlaxEditor.CustomEditors.Editors
             // Add/Remove buttons
             if (!_readOnly)
             {
-                var area = layout.Space(20);
-                var addButton = new Button(area.ContainerControl.Width - (16 + 16 + 2 + 2), 2, 16, 16)
-                {
-                    Text = "+",
-                    TooltipText = "Add new item",
-                    AnchorPreset = AnchorPresets.TopRight,
-                    Parent = area.ContainerControl,
-                    Enabled = !NotNullItems || size > 0,
-                };
-                addButton.Clicked += () =>
-                {
-                    if (IsSetBlocked)
-                        return;
+                var panel = dragArea.HorizontalPanel();
+                panel.Panel.Size = new Float2(0, 20);
+                panel.Panel.Margin = new Margin(2);
 
-                    Resize(Count + 1);
-                };
-                var removeButton = new Button(addButton.Right + 2, addButton.Y, 16, 16)
-                {
-                    Text = "-",
-                    TooltipText = "Remove last item",
-                    AnchorPreset = AnchorPresets.TopRight,
-                    Parent = area.ContainerControl,
-                    Enabled = size > 0,
-                };
-                removeButton.Clicked += () =>
+                var removeButton = panel.Button("-", "Remove last item");
+                removeButton.Button.Size = new Float2(16, 16);
+                removeButton.Button.Enabled = size > 0;
+                removeButton.Button.AnchorPreset = AnchorPresets.TopRight;
+                removeButton.Button.Clicked += () =>
                 {
                     if (IsSetBlocked)
                         return;
 
                     Resize(Count - 1);
                 };
+
+                var addButton = panel.Button("+", "Add new item");
+                addButton.Button.Size = new Float2(16, 16);
+                addButton.Button.Enabled = !NotNullItems || size > 0;
+                addButton.Button.AnchorPreset = AnchorPresets.TopRight;
+                addButton.Button.Clicked += () =>
+                {
+                    if (IsSetBlocked)
+                        return;
+
+                    Resize(Count + 1);
+                };
             }
         }
 
+        /// <inheritdoc />
+        protected override void Deinitialize()
+        {
+            _sizeBox = null;
+
+            base.Deinitialize();
+        }
+
         /// <summary>
         /// Rebuilds the parent layout if its collection.
         /// </summary>
@@ -460,11 +415,9 @@ namespace FlaxEditor.CustomEditors.Editors
                 return;
 
             var cloned = CloneValues();
-
             var tmp = cloned[dstIndex];
             cloned[dstIndex] = cloned[srcIndex];
             cloned[srcIndex] = tmp;
-
             SetValue(cloned);
         }
 
@@ -520,6 +473,17 @@ namespace FlaxEditor.CustomEditors.Editors
             if (HasDifferentValues || HasDifferentTypes)
                 return;
 
+            // Update reference/default value indicator
+            if (_sizeBox != null)
+            {
+                var color = Color.Transparent;
+                if (Values.HasReferenceValue && Values.ReferenceValue is IList referenceValue && referenceValue.Count != Count)
+                    color = FlaxEngine.GUI.Style.Current.BackgroundSelected;
+                else if (Values.HasDefaultValue && Values.DefaultValue is IList defaultValue && defaultValue.Count != Count)
+                    color = Color.Yellow * 0.8f;
+                _sizeBox.BorderColor = color;
+            }
+
             // Check if collection has been resized (by UI or from external source)
             if (Count != _elementsCount)
             {
@@ -546,5 +510,232 @@ namespace FlaxEditor.CustomEditors.Editors
             }
             return base.OnDirty(editor, value, token);
         }
+
+        private class DragAreaControl : VerticalPanel
+        {
+            private DragItems _dragItems;
+            private DragActors _dragActors;
+            private DragHandlers _dragHandlers;
+            private AssetPickerValidator _pickerValidator;
+
+            public ScriptType ElementType
+            {
+                get => _pickerValidator?.AssetType ?? ScriptType.Null;
+                set => _pickerValidator = new AssetPickerValidator(value);
+            }
+
+            public CollectionEditor Editor { get; set; }
+
+            public string FileExtension
+            {
+                set => _pickerValidator.FileExtension = value;
+            }
+
+            /// <inheritdoc />
+            public override void Draw()
+            {
+                if (_dragHandlers is { HasValidDrag: true })
+                {
+                    var area = new Rectangle(Float2.Zero, Size);
+                    Render2D.FillRectangle(area, Color.Orange * 0.5f);
+                    Render2D.DrawRectangle(area, Color.Black);
+                }
+
+                base.Draw();
+            }
+
+            public override void OnDestroy()
+            {
+                _pickerValidator.OnDestroy();
+            }
+
+            private bool ValidateActors(ActorNode node)
+            {
+                return node.Actor.GetScript(ElementType.Type) || ElementType.Type.IsAssignableTo(typeof(Actor));
+            }
+
+            /// <inheritdoc />
+            public override DragDropEffect OnDragEnter(ref Float2 location, DragData data)
+            {
+                var result = base.OnDragEnter(ref location, data);
+                if (result != DragDropEffect.None)
+                    return result;
+
+                if (_dragHandlers == null)
+                {
+                    _dragItems = new DragItems(_pickerValidator.IsValid);
+                    _dragActors = new DragActors(ValidateActors);
+                    _dragHandlers = new DragHandlers
+                    {
+                        _dragActors,
+                        _dragItems
+                    };
+                }
+                return _dragHandlers.OnDragEnter(data);
+            }
+
+            /// <inheritdoc />
+            public override DragDropEffect OnDragMove(ref Float2 location, DragData data)
+            {
+                var result = base.OnDragMove(ref location, data);
+                if (result != DragDropEffect.None)
+                    return result;
+
+                return _dragHandlers.Effect;
+            }
+
+            /// <inheritdoc />
+            public override void OnDragLeave()
+            {
+                _dragHandlers.OnDragLeave();
+
+                base.OnDragLeave();
+            }
+
+            /// <inheritdoc />
+            public override DragDropEffect OnDragDrop(ref Float2 location, DragData data)
+            {
+                var result = base.OnDragDrop(ref location, data);
+                if (result != DragDropEffect.None)
+                {
+                    _dragHandlers.OnDragDrop(null);
+                    return result;
+                }
+
+                if (_dragHandlers.HasValidDrag)
+                {
+                    if (_dragItems.HasValidDrag)
+                    {
+                        var list = Editor.CloneValues();
+                        if (list == null)
+                        {
+                            if (Editor.Values.Type.IsArray)
+                            {
+                                list = TypeUtils.CreateArrayInstance(Editor.Values.Type.GetElementType(), 0);
+                            }
+                            else
+                            {
+                                list = Editor.Values.Type.CreateInstance() as IList;
+                            }
+                        }
+                        if (list.IsFixedSize)
+                        {
+                            var oldSize = list.Count;
+                            var newSize = list.Count + _dragItems.Objects.Count;
+                            var type = Editor.Values.Type.GetElementType();
+                            var array = TypeUtils.CreateArrayInstance(type, newSize);
+                            list.CopyTo(array, 0);
+
+                            for (var i = oldSize; i < newSize; i++)
+                            {
+                                var validator = new AssetPickerValidator
+                                {
+                                    FileExtension = _pickerValidator.FileExtension,
+                                    AssetType = _pickerValidator.AssetType,
+                                    SelectedItem = _dragItems.Objects[i - oldSize],
+                                };
+
+                                if (typeof(AssetItem).IsAssignableFrom(ElementType.Type))
+                                    array.SetValue(validator.SelectedItem, i);
+                                else if (ElementType.Type == typeof(Guid))
+                                    array.SetValue(validator.SelectedID, i);
+                                else if (ElementType.Type == typeof(SceneReference))
+                                    array.SetValue(new SceneReference(validator.SelectedID), i);
+                                else if (ElementType.Type == typeof(string))
+                                    array.SetValue(validator.SelectedPath, i);
+                                else
+                                    array.SetValue(validator.SelectedAsset, i);
+
+                                validator.OnDestroy();
+                            }
+                            Editor.SetValue(array);
+                        }
+                        else
+                        {
+                            foreach (var item in _dragItems.Objects)
+                            {
+                                var validator = new AssetPickerValidator
+                                {
+                                    FileExtension = _pickerValidator.FileExtension,
+                                    AssetType = _pickerValidator.AssetType,
+                                    SelectedItem = item,
+                                };
+
+                                if (typeof(AssetItem).IsAssignableFrom(ElementType.Type))
+                                    list.Add(validator.SelectedItem);
+                                else if (ElementType.Type == typeof(Guid))
+                                    list.Add(validator.SelectedID);
+                                else if (ElementType.Type == typeof(SceneReference))
+                                    list.Add(new SceneReference(validator.SelectedID));
+                                else if (ElementType.Type == typeof(string))
+                                    list.Add(validator.SelectedPath);
+                                else
+                                    list.Add(validator.SelectedAsset);
+
+                                validator.OnDestroy();
+                            }
+                            Editor.SetValue(list);
+                        }
+                    }
+                    else if (_dragActors.HasValidDrag)
+                    {
+                        var list = Editor.CloneValues();
+                        if (list == null)
+                        {
+                            if (Editor.Values.Type.IsArray)
+                            {
+                                list = TypeUtils.CreateArrayInstance(Editor.Values.Type.GetElementType(), 0);
+                            }
+                            else
+                            {
+                                list = Editor.Values.Type.CreateInstance() as IList;
+                            }
+                        }
+
+                        if (list.IsFixedSize)
+                        {
+                            var oldSize = list.Count;
+                            var newSize = list.Count + _dragActors.Objects.Count;
+                            var type = Editor.Values.Type.GetElementType();
+                            var array = TypeUtils.CreateArrayInstance(type, newSize);
+                            list.CopyTo(array, 0);
+
+                            for (var i = oldSize; i < newSize; i++)
+                            {
+                                var actor = _dragActors.Objects[i - oldSize].Actor;
+                                if (ElementType.Type.IsAssignableTo(typeof(Actor)))
+                                {
+                                    array.SetValue(actor, i);
+                                }
+                                else
+                                {
+                                    array.SetValue(actor.GetScript(ElementType.Type), i);
+                                }
+                            }
+                            Editor.SetValue(array);
+                        }
+                        else
+                        {
+                            foreach (var actorNode in _dragActors.Objects)
+                            {
+                                if (ElementType.Type.IsAssignableTo(typeof(Actor)))
+                                {
+                                    list.Add(actorNode.Actor);
+                                }
+                                else
+                                {
+                                    list.Add(actorNode.Actor.GetScript(ElementType.Type));
+                                }
+                            }
+                            Editor.SetValue(list);
+                        }
+                    }
+
+                    _dragHandlers.OnDragDrop(null);
+                }
+
+                return result;
+            }
+        }
     }
 }

Source/Editor/CustomEditors/Editors/ColorTrackball.cs

@@ -3,6 +3,7 @@
 using System.Linq;
 using FlaxEditor.CustomEditors.Elements;
 using FlaxEditor.GUI.Dialogs;
+using FlaxEditor.GUI.Input;
 using FlaxEngine;
 using FlaxEngine.GUI;
 
@@ -17,6 +18,7 @@ namespace FlaxEditor.CustomEditors.Editors
         private FloatValueElement _yElement;
         private FloatValueElement _zElement;
         private FloatValueElement _wElement;
+        private ColorValueBox _colorBox;
         private CustomElement<ColorSelector> _trackball;
 
         /// <inheritdoc />
@@ -53,7 +55,7 @@ namespace FlaxEditor.CustomEditors.Editors
                 gridControl.SlotPadding = new Margin(4, 2, 2, 2);
                 gridControl.ClipChildren = false;
                 gridControl.SlotsHorizontally = 1;
-                gridControl.SlotsVertically = 4;
+                gridControl.SlotsVertically = 5;
 
                 LimitAttribute limit = null;
                 var attributes = Values.GetAttributes();
@@ -61,7 +63,8 @@ namespace FlaxEditor.CustomEditors.Editors
                 {
                     limit = (LimitAttribute)attributes.FirstOrDefault(x => x is LimitAttribute);
                 }
-
+                _colorBox = grid.Custom<ColorValueBox>().CustomControl;
+                _colorBox.ValueChanged += OnColorBoxChanged;
                 _xElement = CreateFloatEditor(grid, limit, Color.Red);
                 _yElement = CreateFloatEditor(grid, limit, Color.Green);
                 _zElement = CreateFloatEditor(grid, limit, Color.Blue);
@@ -93,6 +96,13 @@ namespace FlaxEditor.CustomEditors.Editors
             SetValue(value, token);
         }
 
+        private void OnColorBoxChanged()
+        {
+            var token = _colorBox.IsSliding ? this : null;
+            var color = _colorBox.Value;
+            SetValue(new Float4(color.R, color.G, color.B, color.A), token);
+        }
+
         private void OnValueChanged()
         {
             if (IsSetBlocked)
@@ -130,6 +140,7 @@ namespace FlaxEditor.CustomEditors.Editors
                 _yElement.Value = color.Y;
                 _zElement.Value = color.Z;
                 _wElement.Value = scale;
+                _colorBox.Value = new Color(color.X, color.Y, color.Z, scale);
                 _trackball.CustomControl.Color = Float3.Abs(color);
             }
         }

Source/Editor/CustomEditors/Editors/FloatEditor.cs

@@ -88,6 +88,8 @@ namespace FlaxEditor.CustomEditors.Editors
                     _element.Value = asFloat;
                 else if (value is double asDouble)
                     _element.Value = (float)asDouble;
+                else if (value is int asInt)
+                    _element.Value = (float)asInt;
                 else
                     throw new Exception(string.Format("Invalid value type {0}.", value?.GetType().ToString() ?? "<null>"));
             }

Source/Editor/CustomEditors/Editors/GenericEditor.cs

@@ -66,9 +66,9 @@ namespace FlaxEditor.CustomEditors.Editors
             public HeaderAttribute Header;
 
             /// <summary>
-            /// The visible if attribute.
+            /// The visible if attributes.
             /// </summary>
-            public VisibleIfAttribute VisibleIf;
+            public VisibleIfAttribute[] VisibleIfs;
 
             /// <summary>
             /// The read-only attribute usage flag.
@@ -128,7 +128,7 @@ namespace FlaxEditor.CustomEditors.Editors
                 CustomEditorAlias = (CustomEditorAliasAttribute)attributes.FirstOrDefault(x => x is CustomEditorAliasAttribute);
                 Space = (SpaceAttribute)attributes.FirstOrDefault(x => x is SpaceAttribute);
                 Header = (HeaderAttribute)attributes.FirstOrDefault(x => x is HeaderAttribute);
-                VisibleIf = (VisibleIfAttribute)attributes.FirstOrDefault(x => x is VisibleIfAttribute);
+                VisibleIfs = attributes.OfType<VisibleIfAttribute>().ToArray();
                 IsReadOnly = attributes.FirstOrDefault(x => x is ReadOnlyAttribute) != null;
                 ExpandGroups = attributes.FirstOrDefault(x => x is ExpandGroupsAttribute) != null;
 
@@ -210,17 +210,24 @@ namespace FlaxEditor.CustomEditors.Editors
         private struct VisibleIfCache
         {
             public ScriptMemberInfo Target;
-            public ScriptMemberInfo Source;
+            public ScriptMemberInfo[] Sources;
             public PropertiesListElement PropertiesList;
             public GroupElement Group;
-            public bool Invert;
+            public bool[] InversionList;
             public int LabelIndex;
 
             public bool GetValue(object instance)
             {
-                var value = (bool)Source.GetValue(instance);
-                if (Invert)
-                    value = !value;
+                bool value = true;
+
+                for (int i = 0; i < Sources.Length; i++)
+                {
+                    bool currentValue = (bool)Sources[i].GetValue(instance);
+                    if (InversionList[i])
+                        currentValue = !currentValue;
+
+                    value = value && currentValue;
+                }
                 return value;
             }
         }
@@ -247,8 +254,9 @@ namespace FlaxEditor.CustomEditors.Editors
         /// <param name="type">The type.</param>
         /// <param name="useProperties">True if use type properties.</param>
         /// <param name="useFields">True if use type fields.</param>
+        /// <param name="usePropertiesWithoutSetter">True if use type properties that have only getter method without setter method (aka read-only).</param>
         /// <returns>The items.</returns>
-        public static List<ItemInfo> GetItemsForType(ScriptType type, bool useProperties, bool useFields)
+        public static List<ItemInfo> GetItemsForType(ScriptType type, bool useProperties, bool useFields, bool usePropertiesWithoutSetter = false)
         {
             var items = new List<ItemInfo>();
 
@@ -264,7 +272,7 @@ namespace FlaxEditor.CustomEditors.Editors
                     var showInEditor = attributes.Any(x => x is ShowInEditorAttribute);
 
                     // Skip properties without getter or setter
-                    if (!p.HasGet || (!p.HasSet && !showInEditor))
+                    if (!p.HasGet || (!p.HasSet && !showInEditor && !usePropertiesWithoutSetter))
                         continue;
 
                     // Skip hidden fields, handle special attributes
@@ -297,40 +305,48 @@ namespace FlaxEditor.CustomEditors.Editors
             return items;
         }
 
-        private static ScriptMemberInfo GetVisibleIfSource(ScriptType type, VisibleIfAttribute visibleIf)
+        private static ScriptMemberInfo[] GetVisibleIfSources(ScriptType type, VisibleIfAttribute[] visibleIfs)
         {
-            var property = type.GetProperty(visibleIf.MemberName, BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static);
-            if (property != ScriptMemberInfo.Null)
+            ScriptMemberInfo[] members = Array.Empty<ScriptMemberInfo>();
+
+            for (int i = 0; i < visibleIfs.Length; i++)
             {
-                if (!property.HasGet)
+                var property = type.GetProperty(visibleIfs[i].MemberName, BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static);
+                if (property != ScriptMemberInfo.Null)
                 {
-                    Debug.LogError("Invalid VisibleIf rule. Property has missing getter " + visibleIf.MemberName);
-                    return ScriptMemberInfo.Null;
+                    if (!property.HasGet)
+                    {
+                        Debug.LogError("Invalid VisibleIf rule. Property has missing getter " + visibleIfs[i].MemberName);
+                        continue;
+                    }
+
+                    if (property.ValueType.Type != typeof(bool))
+                    {
+                        Debug.LogError("Invalid VisibleIf rule. Property has to return bool type " + visibleIfs[i].MemberName);
+                        continue;
+                    }
+
+                    members = members.Append(property).ToArray();
+                    continue;
                 }
 
-                if (property.ValueType.Type != typeof(bool))
+                var field = type.GetField(visibleIfs[i].MemberName, BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static);
+                if (field != ScriptMemberInfo.Null)
                 {
-                    Debug.LogError("Invalid VisibleIf rule. Property has to return bool type " + visibleIf.MemberName);
-                    return ScriptMemberInfo.Null;
+                    if (field.ValueType.Type != typeof(bool))
+                    {
+                        Debug.LogError("Invalid VisibleIf rule. Field has to be bool type " + visibleIfs[i].MemberName);
+                        continue;
+                    }
+
+                    members = members.Append(field).ToArray();
+                    continue;
                 }
 
-                return property;
+                Debug.LogError("Invalid VisibleIf rule. Cannot find member " + visibleIfs[i].MemberName);
             }
 
-            var field = type.GetField(visibleIf.MemberName, BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static);
-            if (field != ScriptMemberInfo.Null)
-            {
-                if (field.ValueType.Type != typeof(bool))
-                {
-                    Debug.LogError("Invalid VisibleIf rule. Field has to be bool type " + visibleIf.MemberName);
-                    return ScriptMemberInfo.Null;
-                }
-
-                return field;
-            }
-
-            Debug.LogError("Invalid VisibleIf rule. Cannot find member " + visibleIf.MemberName);
-            return ScriptMemberInfo.Null;
+            return members;
         }
 
         private static void GroupPanelCheckIfCanRevert(LayoutElementsContainer layout, ref bool canRevertReference, ref bool canRevertDefault)
@@ -574,7 +590,7 @@ namespace FlaxEditor.CustomEditors.Editors
         protected virtual void SpawnProperty(LayoutElementsContainer itemLayout, ValueContainer itemValues, ItemInfo item)
         {
             int labelIndex = 0;
-            if ((item.IsReadOnly || item.VisibleIf != null) &&
+            if ((item.IsReadOnly || item.VisibleIfs.Length > 0) &&
                 itemLayout.Children.Count > 0 &&
                 itemLayout.Children[itemLayout.Children.Count - 1] is PropertiesListElement propertiesListElement)
             {
@@ -615,7 +631,7 @@ namespace FlaxEditor.CustomEditors.Editors
                     }
                 }
             }
-            if (item.VisibleIf != null && itemLayout.Children.Count > 0)
+            if (item.VisibleIfs.Length > 0 && itemLayout.Children.Count > 0)
             {
                 PropertiesListElement list = null;
                 GroupElement group = null;
@@ -627,8 +643,8 @@ namespace FlaxEditor.CustomEditors.Editors
                     return;
 
                 // Get source member used to check rule
-                var sourceMember = GetVisibleIfSource(item.Info.DeclaringType, item.VisibleIf);
-                if (sourceMember == ScriptType.Null)
+                var sourceMembers = GetVisibleIfSources(item.Info.DeclaringType, item.VisibleIfs);
+                if (sourceMembers.Length == 0)
                     return;
 
                 // Resize cache
@@ -644,11 +660,11 @@ namespace FlaxEditor.CustomEditors.Editors
                 _visibleIfCaches[count] = new VisibleIfCache
                 {
                     Target = item.Info,
-                    Source = sourceMember,
+                    Sources = sourceMembers,
                     PropertiesList = list,
                     Group = group,
                     LabelIndex = labelIndex,
-                    Invert = item.VisibleIf.Invert,
+                    InversionList = item.VisibleIfs.Select((x, i) => x.Invert).ToArray(),
                 };
             }
         }

Source/Editor/CustomEditors/Editors/GuidEditor.cs

@@ -1,8 +1,12 @@
 // Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
 
 using System;
+using System.Linq;
 using FlaxEditor.CustomEditors.Elements;
+using FlaxEditor.GUI;
+using FlaxEditor.Scripting;
 using FlaxEngine;
+using FlaxEngine.Utilities;
 
 namespace FlaxEditor.CustomEditors.Editors
 {
@@ -13,6 +17,9 @@ namespace FlaxEditor.CustomEditors.Editors
     public sealed class GuidEditor : CustomEditor
     {
         private TextBoxElement _element;
+        private AssetPicker _picker;
+        private bool _isReference;
+        private bool _isRefreshing;
 
         /// <inheritdoc />
         public override DisplayStyle Style => DisplayStyle.Inline;
@@ -20,8 +27,55 @@ namespace FlaxEditor.CustomEditors.Editors
         /// <inheritdoc />
         public override void Initialize(LayoutElementsContainer layout)
         {
-            _element = layout.TextBox();
-            _element.TextBox.EditEnd += OnEditEnd;
+            var attributes = Values.GetAttributes();
+            var assetReference = (AssetReferenceAttribute)attributes?.FirstOrDefault(x => x is AssetReferenceAttribute);
+            if (assetReference != null)
+            {
+                _picker = layout.Custom<AssetPicker>().CustomControl;
+                ScriptType assetType = new ScriptType();
+
+                float height = 48;
+                if (assetReference.UseSmallPicker)
+                    height = 32;
+
+                if (string.IsNullOrEmpty(assetReference.TypeName))
+                {
+                    assetType = ScriptType.Void;
+                }
+                else if (assetReference.TypeName.Length > 1 && assetReference.TypeName[0] == '.')
+                {
+                    // Generic file picker
+                    assetType = ScriptType.Null;
+                    _picker.Validator.FileExtension = assetReference.TypeName;
+                }
+                else
+                {
+                    var customType = TypeUtils.GetType(assetReference.TypeName);
+                    if (customType != ScriptType.Null)
+                        assetType = customType;
+                    else if (!Content.Settings.GameSettings.OptionalPlatformSettings.Contains(assetReference.TypeName))
+                        Debug.LogWarning(string.Format("Unknown asset type '{0}' to use for asset picker filter.", assetReference.TypeName));
+                    else
+                        assetType = ScriptType.Void;
+                }
+
+                _picker.Validator.AssetType = assetType;
+                _picker.Height = height;
+                _picker.SelectedItemChanged += OnSelectedItemChanged;
+                _isReference = true;
+            }
+            else
+            {
+                _element = layout.TextBox();
+                _element.TextBox.EditEnd += OnEditEnd;
+            }
+        }
+
+        private void OnSelectedItemChanged()
+        {
+            if (_isRefreshing)
+                return;
+            SetValue(_picker.Validator.SelectedID);
         }
 
         private void OnEditEnd()
@@ -36,17 +90,32 @@ namespace FlaxEditor.CustomEditors.Editors
         public override void Refresh()
         {
             base.Refresh();
-
+            _isRefreshing = true;
             if (HasDifferentValues)
             {
-                _element.TextBox.Text = string.Empty;
-                _element.TextBox.WatermarkText = "Different values";
+                if (_isReference)
+                {
+                    // Not supported
+                }
+                else
+                {
+                    _element.TextBox.Text = string.Empty;
+                    _element.TextBox.WatermarkText = "Different values";
+                }
             }
             else
             {
-                _element.TextBox.Text = ((Guid)Values[0]).ToString("D");
-                _element.TextBox.WatermarkText = string.Empty;
+                if (_isReference)
+                {
+                    _picker.Validator.SelectedID = (Guid)Values[0];
+                }
+                else
+                {
+                    _element.TextBox.Text = ((Guid)Values[0]).ToString("D");
+                    _element.TextBox.WatermarkText = string.Empty;
+                }
             }
+            _isRefreshing = false;
         }
     }
 }

Source/Editor/CustomEditors/Editors/ModelInstanceEntryEditor.cs

@@ -32,14 +32,16 @@ namespace FlaxEditor.CustomEditors.Editors
                 _mainPanel.HeaderText = "Entry";
             }
 
-            if (ParentEditor == null)
+            if (ParentEditor == null || HasDifferentTypes)
                 return;
             var entry = (ModelInstanceEntry)Values[0];
             var entryIndex = ParentEditor.ChildrenEditors.IndexOf(this);
             var materialLabel = new PropertyNameLabel("Material");
             materialLabel.TooltipText = "The mesh surface material used for the rendering.";
-            if (ParentEditor.ParentEditor?.Values[0] is ModelInstanceActor modelInstance)
+            var parentEditorValues = ParentEditor.ParentEditor?.Values;
+            if (parentEditorValues?[0] is ModelInstanceActor modelInstance)
             {
+                // TODO: store _modelInstance and _material in array for each selected model instance actor
                 _entryIndex = entryIndex;
                 _modelInstance = modelInstance;
                 var slots = modelInstance.MaterialSlots;
@@ -60,6 +62,8 @@ namespace FlaxEditor.CustomEditors.Editors
 
                 // Create material picker
                 var materialValue = new CustomValueContainer(new ScriptType(typeof(MaterialBase)), _material, (instance, index) => _material, (instance, index, value) => _material = value as MaterialBase);
+                for (var i = 1; i < parentEditorValues.Count; i++)
+                    materialValue.Add(_material);
                 var materialEditor = (AssetRefEditor)layout.Property(materialLabel, materialValue);
                 materialEditor.Values.SetDefaultValue(defaultValue);
                 materialEditor.RefreshDefaultValue();
@@ -76,14 +80,14 @@ namespace FlaxEditor.CustomEditors.Editors
                 return;
             _isRefreshing = true;
             var slots = _modelInstance.MaterialSlots;
-            var material = _materialEditor.Picker.SelectedAsset as MaterialBase;
+            var material = _materialEditor.Picker.Validator.SelectedAsset as MaterialBase;
             var defaultMaterial = GPUDevice.Instance.DefaultMaterial;
             var value = (ModelInstanceEntry)Values[0];
             var prevMaterial = value.Material;
             if (!material)
             {
                 // Fallback to default material
-                _materialEditor.Picker.SelectedAsset = defaultMaterial;
+                _materialEditor.Picker.Validator.SelectedAsset = defaultMaterial;
                 value.Material = defaultMaterial;
             }
             else if (material == slots[_entryIndex].Material)

Source/Editor/CustomEditors/Values/CustomValueContainer.cs

@@ -73,7 +73,6 @@ namespace FlaxEditor.CustomEditors
         {
             if (instanceValues == null || instanceValues.Count != Count)
                 throw new ArgumentException();
-
             for (int i = 0; i < Count; i++)
             {
                 var v = instanceValues[i];

Source/Editor/Editor.cpp

@@ -404,13 +404,23 @@ int32 Editor::LoadProduct()
 
     // Create new project option
     if (CommandLine::Options.NewProject)
+    {
+        Array<String> projectFiles;
+        FileSystem::DirectoryGetFiles(projectFiles, projectPath, TEXT("*.flaxproj"), DirectorySearchOption::TopDirectoryOnly);
+        if (projectFiles.Count() == 1)
+        {
+            // Skip creating new project if it already exists
+            LOG(Info, "Skip creatinng new project because it already exists");
+            CommandLine::Options.NewProject.Reset();
+        }
+    }
+    if (CommandLine::Options.NewProject)
     {
         if (projectPath.IsEmpty())
             projectPath = Platform::GetWorkingDirectory();
         else if (!FileSystem::DirectoryExists(projectPath))
             FileSystem::CreateDirectory(projectPath);
         FileSystem::NormalizePath(projectPath);
-
         String folderName = StringUtils::GetFileName(projectPath);
         String tmpName;
         for (int32 i = 0; i < folderName.Length(); i++)

Source/Editor/Editor.cs

@@ -1343,108 +1343,6 @@ namespace FlaxEditor
             public float AutoRebuildNavMeshTimeoutMs;
         }
 
-        [StructLayout(LayoutKind.Sequential)]
-        [NativeMarshalling(typeof(VisualScriptLocalMarshaller))]
-        internal struct VisualScriptLocal
-        {
-            public string Value;
-            public string ValueTypeName;
-            public uint NodeId;
-            public int BoxId;
-        }
-
-        [CustomMarshaller(typeof(VisualScriptLocal), MarshalMode.Default, typeof(VisualScriptLocalMarshaller))]
-        internal static class VisualScriptLocalMarshaller
-        {
-            [StructLayout(LayoutKind.Sequential)]
-            internal struct VisualScriptLocalNative
-            {
-                public IntPtr Value;
-                public IntPtr ValueTypeName;
-                public uint NodeId;
-                public int BoxId;
-            }
-
-            internal static VisualScriptLocal ConvertToManaged(VisualScriptLocalNative unmanaged) => ToManaged(unmanaged);
-            internal static VisualScriptLocalNative ConvertToUnmanaged(VisualScriptLocal managed) => ToNative(managed);
-
-            internal static VisualScriptLocal ToManaged(VisualScriptLocalNative managed)
-            {
-                return new VisualScriptLocal()
-                {
-                    Value = ManagedString.ToManaged(managed.Value),
-                    ValueTypeName = ManagedString.ToManaged(managed.ValueTypeName),
-                    NodeId = managed.NodeId,
-                    BoxId = managed.BoxId,
-                };
-            }
-
-            internal static VisualScriptLocalNative ToNative(VisualScriptLocal managed)
-            {
-                return new VisualScriptLocalNative()
-                {
-                    Value = ManagedString.ToNative(managed.Value),
-                    ValueTypeName = ManagedString.ToNative(managed.ValueTypeName),
-                    NodeId = managed.NodeId,
-                    BoxId = managed.BoxId,
-                };
-            }
-
-            internal static void Free(VisualScriptLocalNative unmanaged)
-            {
-                ManagedString.Free(unmanaged.Value);
-                ManagedString.Free(unmanaged.ValueTypeName);
-            }
-        }
-
-        [StructLayout(LayoutKind.Sequential)]
-        [NativeMarshalling(typeof(VisualScriptStackFrameMarshaller))]
-        internal struct VisualScriptStackFrame
-        {
-            public VisualScript Script;
-            public uint NodeId;
-            public int BoxId;
-        }
-
-        [CustomMarshaller(typeof(VisualScriptStackFrame), MarshalMode.Default, typeof(VisualScriptStackFrameMarshaller))]
-        internal static class VisualScriptStackFrameMarshaller
-        {
-            [StructLayout(LayoutKind.Sequential)]
-            internal struct VisualScriptStackFrameNative
-            {
-                public IntPtr Script;
-                public uint NodeId;
-                public int BoxId;
-            }
-
-            internal static VisualScriptStackFrame ConvertToManaged(VisualScriptStackFrameNative unmanaged) => ToManaged(unmanaged);
-            internal static VisualScriptStackFrameNative ConvertToUnmanaged(VisualScriptStackFrame managed) => ToNative(managed);
-
-            internal static VisualScriptStackFrame ToManaged(VisualScriptStackFrameNative managed)
-            {
-                return new VisualScriptStackFrame()
-                {
-                    Script = VisualScriptMarshaller.ConvertToManaged(managed.Script),
-                    NodeId = managed.NodeId,
-                    BoxId = managed.BoxId,
-                };
-            }
-
-            internal static VisualScriptStackFrameNative ToNative(VisualScriptStackFrame managed)
-            {
-                return new VisualScriptStackFrameNative()
-                {
-                    Script = VisualScriptMarshaller.ConvertToUnmanaged(managed.Script),
-                    NodeId = managed.NodeId,
-                    BoxId = managed.BoxId,
-                };
-            }
-
-            internal static void Free(VisualScriptStackFrameNative unmanaged)
-            {
-            }
-        }
-
         internal void BuildCommand(string arg)
         {
             if (TryBuildCommand(arg))
@@ -1723,21 +1621,6 @@ namespace FlaxEditor
         [LibraryImport("FlaxEngine", EntryPoint = "EditorInternal_RunVisualScriptBreakpointLoopTick", StringMarshalling = StringMarshalling.Custom, StringMarshallingCustomType = typeof(StringMarshaller))]
         internal static partial void Internal_RunVisualScriptBreakpointLoopTick(float deltaTime);
 
-        [LibraryImport("FlaxEngine", EntryPoint = "EditorInternal_GetVisualScriptLocals", StringMarshalling = StringMarshalling.Custom, StringMarshallingCustomType = typeof(StringMarshaller))]
-        [return: MarshalUsing(typeof(FlaxEngine.Interop.ArrayMarshaller<,>), CountElementName = "localsCount")]
-        internal static partial VisualScriptLocal[] Internal_GetVisualScriptLocals(out int localsCount);
-
-        [LibraryImport("FlaxEngine", EntryPoint = "EditorInternal_GetVisualScriptStackFrames", StringMarshalling = StringMarshalling.Custom, StringMarshallingCustomType = typeof(StringMarshaller))]
-        [return: MarshalUsing(typeof(FlaxEngine.Interop.ArrayMarshaller<,>), CountElementName = "stackFrameCount")]
-        internal static partial VisualScriptStackFrame[] Internal_GetVisualScriptStackFrames(out int stackFrameCount);
-
-        [LibraryImport("FlaxEngine", EntryPoint = "EditorInternal_GetVisualScriptPreviousScopeFrame", StringMarshalling = StringMarshalling.Custom, StringMarshallingCustomType = typeof(StringMarshaller))]
-        internal static partial VisualScriptStackFrame Internal_GetVisualScriptPreviousScopeFrame();
-
-        [LibraryImport("FlaxEngine", EntryPoint = "EditorInternal_EvaluateVisualScriptLocal", StringMarshalling = StringMarshalling.Custom, StringMarshallingCustomType = typeof(StringMarshaller))]
-        [return: MarshalAs(UnmanagedType.U1)]
-        internal static partial bool Internal_EvaluateVisualScriptLocal(IntPtr script, ref VisualScriptLocal local);
-
         [LibraryImport("FlaxEngine", EntryPoint = "EditorInternal_DeserializeSceneObject", StringMarshalling = StringMarshalling.Custom, StringMarshallingCustomType = typeof(StringMarshaller))]
         internal static partial void Internal_DeserializeSceneObject(IntPtr sceneObject, string json);
 

Source/Editor/GUI/AssetPicker.cs

@@ -5,6 +5,7 @@ using System.IO;
 using FlaxEditor.Content;
 using FlaxEditor.GUI.Drag;
 using FlaxEditor.Scripting;
+using FlaxEditor.Utilities;
 using FlaxEngine;
 using FlaxEngine.GUI;
 using FlaxEngine.Utilities;
@@ -17,189 +18,21 @@ namespace FlaxEditor.GUI
     /// <seealso cref="Control" />
     /// <seealso cref="IContentItemOwner" />
     [HideInEditor]
-    public class AssetPicker : Control, IContentItemOwner
+    public class AssetPicker : Control
     {
         private const float DefaultIconSize = 64;
         private const float ButtonsOffset = 2;
         private const float ButtonsSize = 12;
 
-        private Asset _selected;
-        private ContentItem _selectedItem;
-        private ScriptType _type;
-        private string _fileExtension;
-
         private bool _isMouseDown;
         private Float2 _mouseDownPos;
         private Float2 _mousePos;
         private DragItems _dragOverElement;
 
         /// <summary>
-        /// Gets or sets the selected item.
+        /// The asset validator. Used to ensure only appropriate items can be picked.
         /// </summary>
-        public ContentItem SelectedItem
-        {
-            get => _selectedItem;
-            set
-            {
-                if (_selectedItem == value)
-                    return;
-                if (value == null)
-                {
-                    if (_selected == null && _selectedItem is SceneItem)
-                    {
-                        // Deselect scene reference
-                        _selectedItem.RemoveReference(this);
-                        _selectedItem = null;
-                        _selected = null;
-                        OnSelectedItemChanged();
-                        return;
-                    }
-
-                    // Deselect
-                    _selectedItem?.RemoveReference(this);
-                    _selectedItem = null;
-                    _selected = null;
-                    OnSelectedItemChanged();
-                }
-                else if (value is SceneItem item)
-                {
-                    if (_selectedItem == item)
-                        return;
-                    if (!IsValid(item))
-                        item = null;
-
-                    // Change value to scene reference (cannot load asset because scene can be already loaded - duplicated ID issue)
-                    _selectedItem?.RemoveReference(this);
-                    _selectedItem = item;
-                    _selected = null;
-                    _selectedItem?.AddReference(this);
-                    OnSelectedItemChanged();
-                }
-                else if (value is AssetItem assetItem)
-                {
-                    SelectedAsset = FlaxEngine.Content.LoadAsync(assetItem.ID);
-                }
-                else
-                {
-                    // Change value
-                    _selectedItem?.RemoveReference(this);
-                    _selectedItem = value;
-                    _selected = null;
-                    OnSelectedItemChanged();
-                }
-            }
-        }
-
-        /// <summary>
-        /// Gets or sets the selected asset identifier.
-        /// </summary>
-        public Guid SelectedID
-        {
-            get
-            {
-                if (_selected != null)
-                    return _selected.ID;
-                if (_selectedItem is AssetItem assetItem)
-                    return assetItem.ID;
-                return Guid.Empty;
-            }
-            set => SelectedItem = Editor.Instance.ContentDatabase.FindAsset(value);
-        }
-
-        /// <summary>
-        /// Gets or sets the selected content item path.
-        /// </summary>
-        public string SelectedPath
-        {
-            get
-            {
-                string path = _selectedItem?.Path ?? _selected?.Path;
-                if (path != null)
-                {
-                    // Convert into path relative to the project (cross-platform)
-                    var projectFolder = Globals.ProjectFolder;
-                    if (path.StartsWith(projectFolder))
-                        path = path.Substring(projectFolder.Length + 1);
-                }
-                return path;
-            }
-            set
-            {
-                if (string.IsNullOrEmpty(value))
-                {
-                    SelectedItem = null;
-                }
-                else
-                {
-                    var path = StringUtils.IsRelative(value) ? Path.Combine(Globals.ProjectFolder, value) : value;
-                    SelectedItem = Editor.Instance.ContentDatabase.Find(path);
-                }
-            }
-        }
-
-        /// <summary>
-        /// Gets or sets the selected asset object.
-        /// </summary>
-        public Asset SelectedAsset
-        {
-            get => _selected;
-            set
-            {
-                // Check if value won't change
-                if (value == _selected)
-                    return;
-
-                // Find item from content database and check it
-                var item = value ? Editor.Instance.ContentDatabase.FindAsset(value.ID) : null;
-                if (item != null && !IsValid(item))
-                    item = null;
-
-                // Change value
-                _selectedItem?.RemoveReference(this);
-                _selectedItem = item;
-                _selected = value;
-                _selectedItem?.AddReference(this);
-                OnSelectedItemChanged();
-            }
-        }
-
-        /// <summary>
-        /// Gets or sets the assets types that this picker accepts (it supports types derived from the given type). Use <see cref="ScriptType.Null"/> for generic file picker.
-        /// </summary>
-        public ScriptType AssetType
-        {
-            get => _type;
-            set
-            {
-                if (_type != value)
-                {
-                    _type = value;
-
-                    // Auto deselect if the current value is invalid
-                    if (_selectedItem != null && !IsValid(_selectedItem))
-                        SelectedItem = null;
-                }
-            }
-        }
-
-        /// <summary>
-        /// Gets or sets the content items extensions filter. Null if unused.
-        /// </summary>
-        public string FileExtension
-        {
-            get => _fileExtension;
-            set
-            {
-                if (_fileExtension != value)
-                {
-                    _fileExtension = value;
-
-                    // Auto deselect if the current value is invalid
-                    if (_selectedItem != null && !IsValid(_selectedItem))
-                        SelectedItem = null;
-                }
-            }
-        }
+        public AssetPickerValidator Validator { get; }
 
         /// <summary>
         /// Occurs when selected item gets changed.
@@ -216,38 +49,6 @@ namespace FlaxEditor.GUI
         /// </summary>
         public bool CanEdit = true;
 
-        private bool IsValid(ContentItem item)
-        {
-            if (_fileExtension != null && !item.Path.EndsWith(_fileExtension))
-                return false;
-            if (CheckValid != null && !CheckValid(item))
-                return false;
-            if (_type == ScriptType.Null)
-                return true;
-
-            if (item is AssetItem assetItem)
-            {
-                // Faster path for binary items (in-built)
-                if (assetItem is BinaryAssetItem binaryItem)
-                    return _type.IsAssignableFrom(new ScriptType(binaryItem.Type));
-
-                // Type filter
-                var type = TypeUtils.GetType(assetItem.TypeName);
-                if (_type.IsAssignableFrom(type))
-                    return true;
-
-                // Json assets can contain any type of the object defined by the C# type (data oriented design)
-                if (assetItem is JsonAssetItem && (_type.Type == typeof(JsonAsset) || _type.Type == typeof(Asset)))
-                    return true;
-
-                // Special case for scene asset references
-                if (_type.Type == typeof(SceneReference) && assetItem is SceneItem)
-                    return true;
-            }
-
-            return false;
-        }
-
         /// <summary>
         /// Initializes a new instance of the <see cref="AssetPicker"/> class.
         /// </summary>
@@ -264,7 +65,8 @@ namespace FlaxEditor.GUI
         public AssetPicker(ScriptType assetType, Float2 location)
         : base(location, new Float2(DefaultIconSize + ButtonsOffset + ButtonsSize, DefaultIconSize))
         {
-            _type = assetType;
+            Validator = new AssetPickerValidator(assetType);
+            Validator.SelectedItemChanged += OnSelectedItemChanged;
             _mousePos = Float2.Minimum;
         }
 
@@ -275,10 +77,10 @@ namespace FlaxEditor.GUI
         {
             // Update tooltip
             string tooltip;
-            if (_selectedItem is AssetItem assetItem)
+            if (Validator.SelectedItem is AssetItem assetItem)
                 tooltip = assetItem.NamePath;
             else
-                tooltip = SelectedPath;
+                tooltip = Validator.SelectedPath;
             TooltipText = tooltip;
 
             SelectedItemChanged?.Invoke();
@@ -289,37 +91,13 @@ namespace FlaxEditor.GUI
             // Do the drag drop operation if has selected element
             if (new Rectangle(Float2.Zero, Size).Contains(ref _mouseDownPos))
             {
-                if (_selected != null)
-                    DoDragDrop(DragAssets.GetDragData(_selected));
-                else if (_selectedItem != null)
-                    DoDragDrop(DragItems.GetDragData(_selectedItem));
+                if (Validator.SelectedAsset != null)
+                    DoDragDrop(DragAssets.GetDragData(Validator.SelectedAsset));
+                else if (Validator.SelectedItem != null)
+                    DoDragDrop(DragItems.GetDragData(Validator.SelectedItem));
             }
         }
 
-        /// <inheritdoc />
-        public void OnItemDeleted(ContentItem item)
-        {
-            // Deselect item
-            SelectedItem = null;
-        }
-
-        /// <inheritdoc />
-        public void OnItemRenamed(ContentItem item)
-        {
-        }
-
-        /// <inheritdoc />
-        public void OnItemReimported(ContentItem item)
-        {
-        }
-
-        /// <inheritdoc />
-        public void OnItemDispose(ContentItem item)
-        {
-            // Deselect item
-            SelectedItem = null;
-        }
-
         private Rectangle IconRect => new Rectangle(0, 0, Height, Height);
 
         private Rectangle Button1Rect => new Rectangle(Height + ButtonsOffset, 0, ButtonsSize, ButtonsSize);
@@ -341,10 +119,10 @@ namespace FlaxEditor.GUI
             if (CanEdit)
                 Render2D.DrawSprite(style.ArrowDown, button1Rect, button1Rect.Contains(_mousePos) ? style.Foreground : style.ForegroundGrey);
 
-            if (_selectedItem != null)
+            if (Validator.SelectedItem != null)
             {
                 // Draw item preview
-                _selectedItem.DrawThumbnail(ref iconRect);
+                Validator.SelectedItem.DrawThumbnail(ref iconRect);
 
                 // Draw buttons
                 if (CanEdit)
@@ -363,7 +141,7 @@ namespace FlaxEditor.GUI
                 {
                     Render2D.DrawText(
                                       style.FontSmall,
-                                      _selectedItem.ShortName,
+                                      Validator.SelectedItem.ShortName,
                                       new Rectangle(button1Rect.Right + 2, 0, sizeForTextLeft, ButtonsSize),
                                       style.Foreground,
                                       TextAlignment.Near,
@@ -371,7 +149,7 @@ namespace FlaxEditor.GUI
                 }
             }
             // Check if has no item but has an asset (eg. virtual asset)
-            else if (_selected)
+            else if (Validator.SelectedAsset)
             {
                 // Draw remove button
                 Render2D.DrawSprite(style.Cross, button3Rect, button3Rect.Contains(_mousePos) ? style.Foreground : style.ForegroundGrey);
@@ -380,8 +158,8 @@ namespace FlaxEditor.GUI
                 float sizeForTextLeft = Width - button1Rect.Right;
                 if (sizeForTextLeft > 30)
                 {
-                    var name = _selected.GetType().Name;
-                    if (_selected.IsVirtual)
+                    var name = Validator.SelectedAsset.GetType().Name;
+                    if (Validator.SelectedAsset.IsVirtual)
                         name += " (virtual)";
                     Render2D.DrawText(
                                       style.FontSmall,
@@ -395,8 +173,8 @@ namespace FlaxEditor.GUI
             else
             {
                 // No element selected
-                Render2D.FillRectangle(iconRect, new Color(0.2f));
-                Render2D.DrawText(style.FontMedium, "No asset\nselected", iconRect, Color.Wheat, TextAlignment.Center, TextAlignment.Center, TextWrapping.NoWrap, 1.0f, Height / DefaultIconSize);
+                Render2D.FillRectangle(iconRect, style.BackgroundNormal);
+                Render2D.DrawText(style.FontMedium, "No asset\nselected", iconRect, Color.Orange, TextAlignment.Center, TextAlignment.Center, TextWrapping.NoWrap, 1.0f, Height / DefaultIconSize);
             }
 
             // Check if drag is over
@@ -407,9 +185,7 @@ namespace FlaxEditor.GUI
         /// <inheritdoc />
         public override void OnDestroy()
         {
-            _selectedItem?.RemoveReference(this);
-            _selectedItem = null;
-            _selected = null;
+            Validator.OnDestroy();
 
             base.OnDestroy();
         }
@@ -463,57 +239,57 @@ namespace FlaxEditor.GUI
                 // Buttons logic
                 if (!CanEdit)
                 {
-                    if (Button1Rect.Contains(location) && _selectedItem != null)
+                    if (Button1Rect.Contains(location) && Validator.SelectedItem != null)
                     {
                         // Select asset
-                        Editor.Instance.Windows.ContentWin.Select(_selectedItem);
+                        Editor.Instance.Windows.ContentWin.Select(Validator.SelectedItem);
                     }
                 }
                 else if (Button1Rect.Contains(location))
                 {
                     Focus();
-                    if (_type != ScriptType.Null)
+                    if (Validator.AssetType != ScriptType.Null)
                     {
                         // Show asset picker popup
-                        var popup = AssetSearchPopup.Show(this, Button1Rect.BottomLeft, IsValid, item =>
+                        var popup = AssetSearchPopup.Show(this, Button1Rect.BottomLeft, Validator.IsValid, item =>
                         {
-                            SelectedItem = item;
+                            Validator.SelectedItem = item;
                             RootWindow.Focus();
                             Focus();
                         });
-                        if (_selected != null)
+                        if (Validator.SelectedAsset != null)
                         {
-                            var selectedAssetName = Path.GetFileNameWithoutExtension(_selected.Path);
+                            var selectedAssetName = Path.GetFileNameWithoutExtension(Validator.SelectedAsset.Path);
                             popup.ScrollToAndHighlightItemByName(selectedAssetName);
                         }
                     }
                     else
                     {
                         // Show content item picker popup
-                        var popup = ContentSearchPopup.Show(this, Button1Rect.BottomLeft, IsValid, item =>
+                        var popup = ContentSearchPopup.Show(this, Button1Rect.BottomLeft, Validator.IsValid, item =>
                         {
-                            SelectedItem = item;
+                            Validator.SelectedItem = item;
                             RootWindow.Focus();
                             Focus();
                         });
-                        if (_selectedItem != null)
+                        if (Validator.SelectedItem != null)
                         {
-                            popup.ScrollToAndHighlightItemByName(_selectedItem.ShortName);
+                            popup.ScrollToAndHighlightItemByName(Validator.SelectedItem.ShortName);
                         }
                     }
                 }
-                else if (_selected != null || _selectedItem != null)
+                else if (Validator.SelectedAsset != null || Validator.SelectedItem != null)
                 {
-                    if (Button2Rect.Contains(location) && _selectedItem != null)
+                    if (Button2Rect.Contains(location) && Validator.SelectedItem != null)
                     {
                         // Select asset
-                        Editor.Instance.Windows.ContentWin.Select(_selectedItem);
+                        Editor.Instance.Windows.ContentWin.Select(Validator.SelectedItem);
                     }
                     else if (Button3Rect.Contains(location))
                     {
                         // Deselect asset
                         Focus();
-                        SelectedItem = null;
+                        Validator.SelectedItem = null;
                     }
                 }
             }
@@ -540,10 +316,10 @@ namespace FlaxEditor.GUI
         {
             Focus();
 
-            if (_selectedItem != null && IconRect.Contains(location))
+            if (Validator.SelectedItem != null && IconRect.Contains(location))
             {
                 // Open it
-                Editor.Instance.ContentEditing.Open(_selectedItem);
+                Editor.Instance.ContentEditing.Open(Validator.SelectedItem);
             }
 
             // Handled
@@ -557,7 +333,7 @@ namespace FlaxEditor.GUI
 
             // Check if drop asset
             if (_dragOverElement == null)
-                _dragOverElement = new DragItems(IsValid);
+                _dragOverElement = new DragItems(Validator.IsValid);
             if (CanEdit && _dragOverElement.OnDragEnter(data))
             {
             }
@@ -590,7 +366,7 @@ namespace FlaxEditor.GUI
             if (CanEdit && _dragOverElement.HasValidDrag)
             {
                 // Select element
-                SelectedItem = _dragOverElement.Objects[0];
+                Validator.SelectedItem = _dragOverElement.Objects[0];
             }
 
             // Clear cache

Source/Editor/GUI/ContextMenu/ContextMenu.cs

@@ -408,9 +408,9 @@ namespace FlaxEditor.GUI.ContextMenu
             {
                 foreach (var child in _panel.Children)
                 {
-                    if (child is ContextMenuChildMenu item && item.Visible)
+                    if (child is ContextMenuButton item && item.Visible)
                     {
-                        item.AdjustArrowAmount = -_panel.VScrollBar.Width;
+                        item.ExtraAdjustmentAmount = -_panel.VScrollBar.Width;
                     }
                 }
             }

Source/Editor/GUI/ContextMenu/ContextMenuButton.cs

@@ -14,6 +14,11 @@ namespace FlaxEditor.GUI.ContextMenu
     public class ContextMenuButton : ContextMenuItem
     {
         private bool _isMouseDown;
+        
+        /// <summary>
+        /// The amount to adjust the short keys and arrow image by in x coordinates.
+        /// </summary>
+        public float ExtraAdjustmentAmount = 0;
 
         /// <summary>
         /// Event fired when user clicks on the button.
@@ -133,7 +138,7 @@ namespace FlaxEditor.GUI.ContextMenu
             if (!string.IsNullOrEmpty(ShortKeys))
             {
                 // Draw short keys
-                Render2D.DrawText(style.FontMedium, ShortKeys, textRect, textColor, TextAlignment.Far, TextAlignment.Center);
+                Render2D.DrawText(style.FontMedium, ShortKeys, new Rectangle(textRect.X + ExtraAdjustmentAmount, textRect.Y, textRect.Width, textRect.Height), textColor, TextAlignment.Far, TextAlignment.Center);
             }
 
             // Draw icon

Source/Editor/GUI/ContextMenu/ContextMenuChildMenu.cs

@@ -17,11 +17,6 @@ namespace FlaxEditor.GUI.ContextMenu
         /// </summary>
         public readonly ContextMenu ContextMenu = new ContextMenu();
 
-        /// <summary>
-        /// The amount to adjust the arrow image by in x coordinates.
-        /// </summary>
-        public float AdjustArrowAmount = 0;
-
         /// <summary>
         /// Initializes a new instance of the <see cref="ContextMenuChildMenu"/> class.
         /// </summary>
@@ -49,7 +44,7 @@ namespace FlaxEditor.GUI.ContextMenu
 
             // Draw arrow
             if (ContextMenu.HasChildren)
-                Render2D.DrawSprite(style.ArrowRight, new Rectangle(Width - 15 + AdjustArrowAmount, (Height - 12) / 2, 12, 12), Enabled ? isCMopened ? style.BackgroundSelected : style.Foreground : style.ForegroundDisabled);
+                Render2D.DrawSprite(style.ArrowRight, new Rectangle(Width - 15 + ExtraAdjustmentAmount, (Height - 12) / 2, 12, 12), Enabled ? isCMopened ? style.BackgroundSelected : style.Foreground : style.ForegroundDisabled);
         }
 
         /// <inheritdoc />

Source/Editor/GUI/Dialogs/ColorPickerDialog.cs

@@ -3,6 +3,8 @@
 using FlaxEditor.GUI.Input;
 using FlaxEngine;
 using FlaxEngine.GUI;
+using FlaxEngine.Json;
+using System.Collections.Generic;
 
 namespace FlaxEditor.GUI.Dialogs
 {
@@ -30,6 +32,8 @@ namespace FlaxEditor.GUI.Dialogs
         private const float HSVMargin = 0.0f;
         private const float ChannelsMargin = 4.0f;
         private const float ChannelTextWidth = 12.0f;
+        private const float SavedColorButtonWidth = 20.0f;
+        private const float SavedColorButtonHeight = 20.0f;
 
         private Color _initialValue;
         private Color _value;
@@ -52,6 +56,9 @@ namespace FlaxEditor.GUI.Dialogs
         private Button _cOK;
         private Button _cEyedropper;
 
+        private List<Color> _savedColors = new List<Color>();
+        private List<Button> _savedColorButtons = new List<Button>();
+
         /// <summary>
         /// Gets the selected color.
         /// </summary>
@@ -111,6 +118,12 @@ namespace FlaxEditor.GUI.Dialogs
             _onChanged = colorChanged;
             _onClosed = pickerClosed;
 
+            // Get saved colors if they exist
+            if (Editor.Instance.ProjectCache.TryGetCustomData("ColorPickerSavedColors", out var savedColors))
+            {
+                _savedColors = JsonSerializer.Deserialize<List<Color>>(savedColors);
+            }
+
             // Selector
             _cSelector = new ColorSelectorWithSliders(180, 18)
             {
@@ -195,6 +208,9 @@ namespace FlaxEditor.GUI.Dialogs
             };
             _cOK.Clicked += OnSubmit;
 
+            // Create saved color buttons
+            CreateAllSaveButtons();
+
             // Eyedropper button
             var style = Style.Current;
             _cEyedropper = new Button(_cOK.X - EyedropperMargin, _cHex.Bottom + PickerMargin)
@@ -216,6 +232,50 @@ namespace FlaxEditor.GUI.Dialogs
             SelectedColor = initialValue;
         }
 
+        private void OnSavedColorButtonClicked(Button button)
+        {
+            if (button.Tag == null)
+            {
+                // Prevent setting same color 2 times... because why...
+                foreach (var color in _savedColors)
+                {
+                    if (color == _value)
+                    {
+                        return;
+                    }
+                }
+
+                // Set color of button to current value;
+                button.BackgroundColor = _value;
+                button.BackgroundColorHighlighted = _value;
+                button.BackgroundColorSelected = _value.RGBMultiplied(0.8f);
+                button.Text = "";
+                button.Tag = _value;
+
+                // Save new colors
+                _savedColors.Add(_value);
+                var savedColors = JsonSerializer.Serialize(_savedColors, typeof(List<Color>));
+                Editor.Instance.ProjectCache.SetCustomData("ColorPickerSavedColors", savedColors);
+
+                // create new + button
+                if (_savedColorButtons.Count < 8)
+                {
+                    var savedColorButton = new Button(PickerMargin * (_savedColorButtons.Count + 1) + SavedColorButtonWidth * _savedColorButtons.Count, Height - SavedColorButtonHeight - PickerMargin, SavedColorButtonWidth, SavedColorButtonHeight)
+                    {
+                        Text = "+",
+                        Parent = this,
+                        Tag = null,
+                    };
+                    savedColorButton.ButtonClicked += (b) => OnSavedColorButtonClicked(b);
+                    _savedColorButtons.Add(savedColorButton);
+                }
+            }
+            else
+            {
+                SelectedColor = (Color)button.Tag;
+            }
+        }
+
         private void OnColorPicked(Color32 colorPicked)
         {
             if (_activeEyedropper)
@@ -319,7 +379,9 @@ namespace FlaxEditor.GUI.Dialogs
         protected override void OnShow()
         {
             // Auto cancel on lost focus
+#if !PLATFORM_LINUX
             ((WindowRootControl)Root).Window.LostFocus += OnCancel;
+#endif
 
             base.OnShow();
         }
@@ -338,6 +400,111 @@ namespace FlaxEditor.GUI.Dialogs
             return base.OnKeyDown(key);
         }
 
+        /// <inheritdoc />
+        public override bool OnMouseUp(Float2 location, MouseButton button)
+        {
+            if (base.OnMouseUp(location, button))
+            {
+                return true;
+            }
+
+            var child = GetChildAtRecursive(location);
+            if (button == MouseButton.Right && child is Button b && b.Tag is Color c)
+            {
+                // Show menu
+                var menu = new ContextMenu.ContextMenu();
+                var replaceButton = menu.AddButton("Replace");
+                replaceButton.Clicked += () => OnSavedColorReplace(b);
+                var deleteButton = menu.AddButton("Delete");
+                deleteButton.Clicked += () => OnSavedColorDelete(b);
+                _disableEvents = true;
+                menu.Show(this, location);
+                menu.VisibleChanged += (c) => _disableEvents = false;
+                return true;
+            }
+
+            return false;
+        }
+
+        private void OnSavedColorReplace(Button button)
+        {
+            // Prevent setting same color 2 times... because why...
+            foreach (var color in _savedColors)
+            {
+                if (color == _value)
+                {
+                    return;
+                }
+            }
+
+            // Set new Color in spot
+            for (int i = 0; i < _savedColors.Count; i++)
+            {
+                var color = _savedColors[i];
+                if (color == (Color)button.Tag)
+                {
+                    color = _value;
+                }
+            }
+
+            // Set color of button to current value;
+            button.BackgroundColor = _value;
+            button.BackgroundColorHighlighted = _value;
+            button.Text = "";
+            button.Tag = _value;
+
+            // Save new colors
+            var savedColors = JsonSerializer.Serialize(_savedColors, typeof(List<Color>));
+            Editor.Instance.ProjectCache.SetCustomData("ColorPickerSavedColors", savedColors);
+        }
+
+        private void OnSavedColorDelete(Button button)
+        {
+            _savedColors.Remove((Color)button.Tag);
+
+            foreach (var b in _savedColorButtons)
+            {
+                Children.Remove(b);
+            }
+            _savedColorButtons.Clear();
+
+            CreateAllSaveButtons();
+
+            // Save new colors
+            var savedColors = JsonSerializer.Serialize(_savedColors, typeof(List<Color>));
+            Editor.Instance.ProjectCache.SetCustomData("ColorPickerSavedColors", savedColors);
+        }
+
+        private void CreateAllSaveButtons()
+        {
+            // Create saved color buttons
+            for (int i = 0; i < _savedColors.Count; i++)
+            {
+                var savedColor = _savedColors[i];
+                var savedColorButton = new Button(PickerMargin * (i + 1) + SavedColorButtonWidth * i, Height - SavedColorButtonHeight - PickerMargin, SavedColorButtonWidth, SavedColorButtonHeight)
+                {
+                    Parent = this,
+                    Tag = savedColor,
+                    BackgroundColor = savedColor,
+                    BackgroundColorHighlighted = savedColor,
+                    BackgroundColorSelected = savedColor.RGBMultiplied(0.8f),
+                };
+                savedColorButton.ButtonClicked += (b) => OnSavedColorButtonClicked(b);
+                _savedColorButtons.Add(savedColorButton);
+            }
+            if (_savedColors.Count < 8)
+            {
+                var savedColorButton = new Button(PickerMargin * (_savedColors.Count + 1) + SavedColorButtonWidth * _savedColors.Count, Height - SavedColorButtonHeight - PickerMargin, SavedColorButtonWidth, SavedColorButtonHeight)
+                {
+                    Text = "+",
+                    Parent = this,
+                    Tag = null,
+                };
+                savedColorButton.ButtonClicked += (b) => OnSavedColorButtonClicked(b);
+                _savedColorButtons.Add(savedColorButton);
+            }
+        }
+
         /// <inheritdoc />
         public override void OnSubmit()
         {

Source/Editor/GUI/Dialogs/Dialog.cs

@@ -39,6 +39,11 @@ namespace FlaxEditor.GUI.Dialogs
         /// </summary>
         public DialogResult Result => _result;
 
+        /// <summary>
+        /// Returns the size of the dialog.
+        /// </summary>
+        public Float2 DialogSize => _dialogSize;
+
         /// <summary>
         /// Initializes a new instance of the <see cref="Dialog"/> class.
         /// </summary>

Source/Editor/GUI/Docking/DockHintWindow.cs

@@ -44,11 +44,11 @@ namespace FlaxEditor.GUI.Docking
                 var mousePos = window.MousePosition;
                 var previousSize = window.Size;
                 window.Restore();
-                window.Position = FlaxEngine.Input.MouseScreenPosition - mousePos * window.Size / previousSize;
+                window.Position = Platform.MousePosition - mousePos * window.Size / previousSize;
             }
 
             // Calculate dragging offset and move window to the destination position
-            var mouseScreenPosition = FlaxEngine.Input.MouseScreenPosition;
+            var mouseScreenPosition = Platform.MousePosition;
 
             // If the _toMove window was not focused when initializing this window, the result vector only contains zeros
             // and to prevent a failure, we need to perform an update for the drag offset at later time which will be done in the OnMouseMove event handler.
@@ -83,6 +83,7 @@ namespace FlaxEditor.GUI.Docking
             // Enable hit window presentation
             Proxy.Window.RenderingEnabled = true;
             Proxy.Window.Show();
+            Proxy.Window.Focus();
         }
 
         /// <summary>
@@ -113,7 +114,7 @@ namespace FlaxEditor.GUI.Docking
                 var window = _toMove.Window?.Window;
                 if (window == null)
                     return;
-                var mouse = FlaxEngine.Input.MouseScreenPosition;
+                var mouse = Platform.MousePosition;
 
                 // Move base window
                 window.Position = mouse - _dragOffset;
@@ -193,7 +194,7 @@ namespace FlaxEditor.GUI.Docking
 
             // Move window to the mouse position (with some offset for caption bar)
             var window = (WindowRootControl)toMove.Root;
-            var mouse = FlaxEngine.Input.MouseScreenPosition;
+            var mouse = Platform.MousePosition;
             window.Window.Position = mouse - new Float2(8, 8);
 
             // Get floating panel
@@ -244,7 +245,7 @@ namespace FlaxEditor.GUI.Docking
         private void UpdateRects()
         {
             // Cache mouse position
-            _mouse = FlaxEngine.Input.MouseScreenPosition;
+            _mouse = Platform.MousePosition;
 
             // Check intersection with any dock panel
             var uiMouse = _mouse;
@@ -270,15 +271,16 @@ namespace FlaxEditor.GUI.Docking
                 // Cache dock rectangles
                 var size = _rectDock.Size;
                 var offset = _rectDock.Location;
-                float BorderMargin = 4.0f;
-                float ProxyHintWindowsSize2 = Proxy.HintWindowsSize * 0.5f;
-                float centerX = size.X * 0.5f;
-                float centerY = size.Y * 0.5f;
-                _rUpper = new Rectangle(centerX - ProxyHintWindowsSize2, BorderMargin, Proxy.HintWindowsSize, Proxy.HintWindowsSize) + offset;
-                _rBottom = new Rectangle(centerX - ProxyHintWindowsSize2, size.Y - Proxy.HintWindowsSize - BorderMargin, Proxy.HintWindowsSize, Proxy.HintWindowsSize) + offset;
-                _rLeft = new Rectangle(BorderMargin, centerY - ProxyHintWindowsSize2, Proxy.HintWindowsSize, Proxy.HintWindowsSize) + offset;
-                _rRight = new Rectangle(size.X - Proxy.HintWindowsSize - BorderMargin, centerY - ProxyHintWindowsSize2, Proxy.HintWindowsSize, Proxy.HintWindowsSize) + offset;
-                _rCenter = new Rectangle(centerX - ProxyHintWindowsSize2, centerY - ProxyHintWindowsSize2, Proxy.HintWindowsSize, Proxy.HintWindowsSize) + offset;
+                var borderMargin = 4.0f;
+                var hintWindowsSize = Proxy.HintWindowsSize * Platform.DpiScale;
+                var hintWindowsSize2 = hintWindowsSize * 0.5f;
+                var centerX = size.X * 0.5f;
+                var centerY = size.Y * 0.5f;
+                _rUpper = new Rectangle(centerX - hintWindowsSize2, borderMargin, hintWindowsSize, hintWindowsSize) + offset;
+                _rBottom = new Rectangle(centerX - hintWindowsSize2, size.Y - hintWindowsSize - borderMargin, hintWindowsSize, hintWindowsSize) + offset;
+                _rLeft = new Rectangle(borderMargin, centerY - hintWindowsSize2, hintWindowsSize, hintWindowsSize) + offset;
+                _rRight = new Rectangle(size.X - hintWindowsSize - borderMargin, centerY - hintWindowsSize2, hintWindowsSize, hintWindowsSize) + offset;
+                _rCenter = new Rectangle(centerX - hintWindowsSize2, centerY - hintWindowsSize2, hintWindowsSize, hintWindowsSize) + offset;
 
                 // Hit test
                 DockState toSet = DockState.Float;
@@ -428,7 +430,6 @@ namespace FlaxEditor.GUI.Docking
             {
                 if (Window == null)
                 {
-                    // Create proxy window
                     var settings = CreateWindowSettings.Default;
                     settings.Title = "DockHint.Window";
                     settings.Size = initSize;
@@ -440,12 +441,10 @@ namespace FlaxEditor.GUI.Docking
                     settings.IsRegularWindow = false;
                     settings.SupportsTransparency = true;
                     settings.ShowInTaskbar = false;
-                    settings.ShowAfterFirstPaint = true;
+                    settings.ShowAfterFirstPaint = false;
                     settings.IsTopmost = true;
 
                     Window = Platform.CreateWindow(ref settings);
-
-                    // Set opacity and background color
                     Window.Opacity = 0.6f;
                     Window.GUI.BackgroundColor = Style.Current.DragWindow;
                 }
@@ -465,7 +464,7 @@ namespace FlaxEditor.GUI.Docking
 
                 var settings = CreateWindowSettings.Default;
                 settings.Title = name;
-                settings.Size = new Float2(HintWindowsSize);
+                settings.Size = new Float2(HintWindowsSize * Platform.DpiScale);
                 settings.AllowInput = false;
                 settings.AllowMaximize = false;
                 settings.AllowMinimize = false;
@@ -479,7 +478,6 @@ namespace FlaxEditor.GUI.Docking
                 settings.ShowAfterFirstPaint = false;
 
                 win = Platform.CreateWindow(ref settings);
-
                 win.Opacity = 0.6f;
                 win.GUI.BackgroundColor = Style.Current.DragWindow;
             }

Source/Editor/GUI/Docking/DockPanel.cs

@@ -465,36 +465,47 @@ namespace FlaxEditor.GUI.Docking
             {
                 if (Parent.Parent is SplitPanel splitter)
                 {
-                    // Check if has any child panels
-                    var childPanel = new List<DockPanel>(_childPanels);
-                    for (int i = 0; i < childPanel.Count; i++)
+                    // Check if there is another nested dock panel inside this dock panel and extract it here
+                    var childPanels = _childPanels.ToArray();
+                    if (childPanels.Length != 0)
                     {
-                        // Undock all tabs
-                        var panel = childPanel[i];
-                        int count = panel.TabsCount;
-                        while (count-- > 0)
+                        // Move tabs from child panels into this one
+                        DockWindow selectedTab = null;
+                        foreach (var childPanel in childPanels)
                         {
-                            panel.GetTab(0).Close();
+                            var childPanelTabs = childPanel.Tabs.ToArray();
+                            for (var i = 0; i < childPanelTabs.Length; i++)
+                            {
+                                var childPanelTab = childPanelTabs[i];
+                                if (selectedTab == null && childPanelTab.IsSelected)
+                                    selectedTab = childPanelTab;
+                                childPanel.UndockWindow(childPanelTab);
+                                AddTab(childPanelTab, false);
+                            }
                         }
+                        if (selectedTab != null)
+                            SelectTab(selectedTab);
                     }
-
-                    // Unlink splitter
-                    var splitterParent = splitter.Parent;
-                    Assert.IsNotNull(splitterParent);
-                    splitter.Parent = null;
-
-                    // Move controls from second split panel to the split panel parent
-                    var scrPanel = Parent == splitter.Panel2 ? splitter.Panel1 : splitter.Panel2;
-                    var srcPanelChildrenCount = scrPanel.ChildrenCount;
-                    for (int i = srcPanelChildrenCount - 1; i >= 0 && scrPanel.ChildrenCount > 0; i--)
+                    else
                     {
-                        scrPanel.GetChild(i).Parent = splitterParent;
-                    }
-                    Assert.IsTrue(scrPanel.ChildrenCount == 0);
-                    Assert.IsTrue(splitterParent.ChildrenCount == srcPanelChildrenCount);
+                        // Unlink splitter
+                        var splitterParent = splitter.Parent;
+                        Assert.IsNotNull(splitterParent);
+                        splitter.Parent = null;
 
-                    // Delete
-                    splitter.Dispose();
+                        // Move controls from second split panel to the split panel parent
+                        var scrPanel = Parent == splitter.Panel2 ? splitter.Panel1 : splitter.Panel2;
+                        var srcPanelChildrenCount = scrPanel.ChildrenCount;
+                        for (int i = srcPanelChildrenCount - 1; i >= 0 && scrPanel.ChildrenCount > 0; i--)
+                        {
+                            scrPanel.GetChild(i).Parent = splitterParent;
+                        }
+                        Assert.IsTrue(scrPanel.ChildrenCount == 0);
+                        Assert.IsTrue(splitterParent.ChildrenCount == srcPanelChildrenCount);
+
+                        // Delete
+                        splitter.Dispose();
+                    }
                 }
                 else if (!IsMaster)
                 {
@@ -507,9 +518,9 @@ namespace FlaxEditor.GUI.Docking
             }
         }
 
-        internal virtual void DockWindowInternal(DockState state, DockWindow window)
+        internal virtual void DockWindowInternal(DockState state, DockWindow window, bool autoSelect = true, float? splitterValue = null)
         {
-            DockWindow(state, window);
+            DockWindow(state, window, autoSelect, splitterValue);
         }
 
         /// <summary>
@@ -517,7 +528,9 @@ namespace FlaxEditor.GUI.Docking
         /// </summary>
         /// <param name="state">The state.</param>
         /// <param name="window">The window.</param>
-        protected virtual void DockWindow(DockState state, DockWindow window)
+        /// <param name="autoSelect">Whether or not to automatically select the window after docking it.</param>
+        /// <param name="splitterValue">The splitter value to use when docking to window.</param>
+        protected virtual void DockWindow(DockState state, DockWindow window, bool autoSelect = true, float? splitterValue = null)
         {
             CreateTabsProxy();
 
@@ -525,12 +538,12 @@ namespace FlaxEditor.GUI.Docking
             if (state == DockState.DockFill)
             {
                 // Add tab
-                AddTab(window);
+                AddTab(window, autoSelect);
             }
             else
             {
                 // Create child panel
-                var dockPanel = CreateChildPanel(state, DefaultSplitterValue);
+                var dockPanel = CreateChildPanel(state, splitterValue ?? DefaultSplitterValue);
 
                 // Dock window as a tab in a child panel
                 dockPanel.DockWindow(DockState.DockFill, window);
@@ -582,19 +595,17 @@ namespace FlaxEditor.GUI.Docking
         /// Adds the tab.
         /// </summary>
         /// <param name="window">The window to insert as a tab.</param>
-        protected virtual void AddTab(DockWindow window)
+        /// <param name="autoSelect">True if auto-select newly added tab.</param>
+        protected virtual void AddTab(DockWindow window, bool autoSelect = true)
         {
-            // Dock
             _tabs.Add(window);
             window.ParentDockPanel = this;
-
-            // Select tab
-            SelectTab(window);
+            if (autoSelect)
+                SelectTab(window);
         }
 
         private void CreateTabsProxy()
         {
-            // Check if has no tabs proxy created
             if (_tabsProxy == null)
             {
                 // Create proxy and make set simple full dock

Source/Editor/GUI/Docking/DockPanelProxy.cs

@@ -13,6 +13,7 @@ namespace FlaxEditor.GUI.Docking
     public class DockPanelProxy : ContainerControl
     {
         private DockPanel _panel;
+        private double _dragEnterTime = -1;
 
         /// <summary>
         /// The is mouse down flag (left button).
@@ -256,8 +257,8 @@ namespace FlaxEditor.GUI.Docking
                     else
                     {
                         tabColor = style.BackgroundHighlighted;
-                        Render2D.DrawLine(tabRect.BottomLeft - new Float2(0 , 1), tabRect.UpperLeft, tabColor);
-                        Render2D.DrawLine(tabRect.BottomRight - new Float2(0 , 1), tabRect.UpperRight, tabColor);
+                        Render2D.DrawLine(tabRect.BottomLeft - new Float2(0, 1), tabRect.UpperLeft, tabColor);
+                        Render2D.DrawLine(tabRect.BottomRight - new Float2(0, 1), tabRect.UpperRight, tabColor);
                     }
 
                     if (tab.Icon.IsValid)
@@ -477,11 +478,7 @@ namespace FlaxEditor.GUI.Docking
             var result = base.OnDragEnter(ref location, data);
             if (result != DragDropEffect.None)
                 return result;
-
-            if (TrySelectTabUnderLocation(ref location))
-                return DragDropEffect.Move;
-
-            return DragDropEffect.None;
+            return TrySelectTabUnderLocation(ref location);
         }
 
         /// <inheritdoc />
@@ -490,11 +487,15 @@ namespace FlaxEditor.GUI.Docking
             var result = base.OnDragMove(ref location, data);
             if (result != DragDropEffect.None)
                 return result;
+            return TrySelectTabUnderLocation(ref location);
+        }
 
-            if (TrySelectTabUnderLocation(ref location))
-                return DragDropEffect.Move;
+        /// <inheritdoc />
+        public override void OnDragLeave()
+        {
+            _dragEnterTime = -1;
 
-            return DragDropEffect.None;
+            base.OnDragLeave();
         }
 
         /// <inheritdoc />
@@ -503,17 +504,25 @@ namespace FlaxEditor.GUI.Docking
             rect = new Rectangle(0, DockPanel.DefaultHeaderHeight, Width, Height - DockPanel.DefaultHeaderHeight);
         }
 
-        private bool TrySelectTabUnderLocation(ref Float2 location)
+        private DragDropEffect TrySelectTabUnderLocation(ref Float2 location)
         {
             var tab = GetTabAtPos(location, out _);
             if (tab != null)
             {
+                // Auto-select tab only if drag takes some time
+                var time = Platform.TimeSeconds;
+                if (_dragEnterTime < 0)
+                    _dragEnterTime = time;
+                if (time - _dragEnterTime < 0.3f)
+                    return DragDropEffect.Link;
+                _dragEnterTime = -1;
+
                 _panel.SelectTab(tab);
                 Update(0); // Fake update
-                return true;
+                return DragDropEffect.Move;
             }
-
-            return false;
+            _dragEnterTime = -1;
+            return DragDropEffect.None;
         }
 
         private void ShowContextMenu(DockWindow tab, ref Float2 location)

Source/Editor/GUI/Docking/DockWindow.cs

@@ -63,12 +63,9 @@ namespace FlaxEditor.GUI.Docking
         public bool IsHidden => !Visible || _dockedTo == null;
 
         /// <summary>
-        /// Gets the default window size.
+        /// Gets the default window size (in UI units, unscaled by DPI which is handled by windowing system).
         /// </summary>
-        /// <remarks>
-        /// Scaled by the DPI, because the window should be large enough for its content on every monitor
-        /// </remarks>
-        public virtual Float2 DefaultSize => new Float2(900, 580) * DpiScale;
+        public virtual Float2 DefaultSize => new Float2(900, 580);
 
         /// <summary>
         /// Gets the serialization typename.
@@ -217,7 +214,9 @@ namespace FlaxEditor.GUI.Docking
         /// </summary>
         /// <param name="state">Initial window state.</param>
         /// <param name="toDock">Panel to dock to it.</param>
-        public void Show(DockState state = DockState.Float, DockPanel toDock = null)
+        /// <param name="autoSelect">Only used if <paramref name="toDock"/> is set. If true the window will be selected after docking it.</param>
+        /// <param name="splitterValue">Only used if <paramref name="toDock"/> is set. The splitter value to use. If not specified, a default value will be used.</param>
+        public void Show(DockState state = DockState.Float, DockPanel toDock = null, bool autoSelect = true, float? splitterValue = null)
         {
             if (state == DockState.Hidden)
             {
@@ -235,7 +234,7 @@ namespace FlaxEditor.GUI.Docking
                 Undock();
 
                 // Then dock
-                (toDock ?? _masterPanel).DockWindowInternal(state, this);
+                (toDock ?? _masterPanel).DockWindowInternal(state, this, autoSelect, splitterValue);
                 OnShow();
                 PerformLayout();
             }

Source/Editor/GUI/Docking/FloatWindowDockPanel.cs

@@ -72,7 +72,7 @@ namespace FlaxEditor.GUI.Docking
             settings.Size = size;
             settings.Position = location;
             settings.MinimumSize = new Float2(1);
-            settings.MaximumSize = new Float2(4096);
+            settings.MaximumSize = Float2.Zero; // Unlimited size
             settings.Fullscreen = false;
             settings.HasBorder = true;
             settings.SupportsTransparency = false;

Source/Editor/GUI/Input/ColorValueBox.cs

@@ -14,6 +14,8 @@ namespace FlaxEditor.GUI.Input
     [HideInEditor]
     public class ColorValueBox : Control
     {
+        private bool _isMouseDown;
+
         /// <summary>
         /// Delegate function used for the color picker events handling.
         /// </summary>
@@ -134,11 +136,22 @@ namespace FlaxEditor.GUI.Input
             Render2D.DrawRectangle(r, IsMouseOver || IsNavFocused ? style.BackgroundSelected : Color.Black);
         }
 
+        /// <inheritdoc />
+        public override bool OnMouseDown(Float2 location, MouseButton button)
+        {
+            _isMouseDown = true;
+            return base.OnMouseDown(location, button);
+        }
+
         /// <inheritdoc />
         public override bool OnMouseUp(Float2 location, MouseButton button)
         {
-            Focus();
-            OnSubmit();
+            if (_isMouseDown)
+            {
+                _isMouseDown = false;
+                Focus();
+                OnSubmit();
+            }
             return true;
         }
 

Source/Editor/GUI/PlatformSelector.cs

@@ -100,9 +100,10 @@ namespace FlaxEditor.GUI
             AutoResize = true;
             Offsets = new Margin(0, 0, 0, IconSize);
 
-            _mouseOverColor = style.Foreground;
-            _selectedColor = style.Foreground;
-            _defaultColor = style.ForegroundGrey;
+            // Ignoring style on purpose (style would make sense if the icons were white, but they are colored)
+            _mouseOverColor = new Color(0.8f, 0.8f, 0.8f, 1f);
+            _selectedColor = Color.White;
+            _defaultColor = new Color(0.7f, 0.7f, 0.7f, 0.5f);
 
             for (int i = 0; i < platforms.Length; i++)
             {

Source/Editor/GUI/Row.cs

@@ -24,6 +24,11 @@ namespace FlaxEditor.GUI
         /// </summary>
         public object[] Values { get; set; }
 
+        /// <summary>
+        /// Gets or sets the cell background colors. Null if unused, transparent values are ignored.
+        /// </summary>
+        public Color[] BackgroundColors { get; set; }
+
         /// <summary>
         /// Gets or sets the row depth level.
         /// </summary>
@@ -58,6 +63,7 @@ namespace FlaxEditor.GUI
             {
                 float x = 0;
                 int end = Mathf.Min(Values.Length, _table.Columns.Length);
+                var backgroundColors = BackgroundColors;
                 for (int i = 0; i < end; i++)
                 {
                     var column = _table.Columns[i];
@@ -98,7 +104,9 @@ namespace FlaxEditor.GUI
                     rect.Width -= leftDepthMargin;
 
                     Render2D.PushClip(rect);
-                    Render2D.DrawText(style.FontMedium, text, rect, Color.White, column.CellAlignment, TextAlignment.Center);
+                    if (backgroundColors != null && backgroundColors[i].A > 0)
+                        Render2D.FillRectangle(rect, backgroundColors[i]);
+                    Render2D.DrawText(style.FontMedium, text, rect, style.Foreground, column.CellAlignment, TextAlignment.Center);
                     Render2D.PopClip();
 
                     x += width;

Source/Editor/GUI/Tabs/Tab.cs

@@ -13,6 +13,8 @@ namespace FlaxEditor.GUI.Tabs
     [HideInEditor]
     public class Tab : ContainerControl
     {
+        internal Tabs _selectedInTabs;
+
         /// <summary>
         /// Gets or sets the text.
         /// </summary>
@@ -86,5 +88,25 @@ namespace FlaxEditor.GUI.Tabs
         {
             return new Tabs.TabHeader((Tabs)Parent, this);
         }
+
+        /// <inheritdoc />
+        protected override void OnParentChangedInternal()
+        {
+            if (_selectedInTabs != null)
+                _selectedInTabs.SelectedTab = null;
+
+            base.OnParentChangedInternal();
+        }
+
+        /// <inheritdoc />
+        public override void OnDestroy()
+        {
+            if (IsDisposing)
+                return;
+            if (_selectedInTabs != null)
+                _selectedInTabs.SelectedTab = null;
+
+            base.OnDestroy();
+        }
     }
 }

Source/Editor/GUI/Tabs/Tabs.cs

@@ -239,7 +239,7 @@ namespace FlaxEditor.GUI.Tabs
         /// </summary>
         public Tab SelectedTab
         {
-            get => _selectedIndex == -1 && Children.Count > _selectedIndex + 1 ? null : Children[_selectedIndex + 1] as Tab;
+            get => _selectedIndex < 0 || Children.Count <= _selectedIndex ? null : Children[_selectedIndex + 1] as Tab;
             set => SelectedTabIndex = value != null ? Children.IndexOf(value) - 1 : -1;
         }
 
@@ -263,7 +263,12 @@ namespace FlaxEditor.GUI.Tabs
                 // Check if index will change
                 if (_selectedIndex != index)
                 {
-                    SelectedTab?.OnDeselected();
+                    var prev = SelectedTab;
+                    if (prev != null)
+                    {
+                        prev._selectedInTabs = null;
+                        prev.OnDeselected();
+                    }
                     _selectedIndex = index;
                     PerformLayout();
                     OnSelectedTabChanged();
@@ -342,8 +347,13 @@ namespace FlaxEditor.GUI.Tabs
         /// </summary>
         protected virtual void OnSelectedTabChanged()
         {
+            var selectedTab = SelectedTab;
             SelectedTabChanged?.Invoke(this);
-            SelectedTab?.OnSelected();
+            if (selectedTab != null)
+            {
+                selectedTab._selectedInTabs = this;
+                selectedTab.OnSelected();
+            }
         }
 
         /// <inheritdoc />

Source/Editor/GUI/Timeline/Timeline.cs

@@ -627,10 +627,11 @@ namespace FlaxEditor.GUI.Timeline
                 Parent = this
             };
 
+            var style = Style.Current;
             var headerTopArea = new ContainerControl
             {
                 AutoFocus = false,
-                BackgroundColor = Style.Current.LightBackground,
+                BackgroundColor = style.LightBackground,
                 AnchorPreset = AnchorPresets.HorizontalStretchTop,
                 Offsets = new Margin(0, 0, 0, HeaderTopAreaHeight),
                 Parent = _splitter.Panel1
@@ -683,7 +684,7 @@ namespace FlaxEditor.GUI.Timeline
                 {
                     AutoFocus = false,
                     ClipChildren = false,
-                    BackgroundColor = Style.Current.LightBackground,
+                    BackgroundColor = style.LightBackground,
                     AnchorPreset = AnchorPresets.HorizontalStretchBottom,
                     Offsets = new Margin(0, 0, -playbackButtonsSize, playbackButtonsSize),
                     Parent = _splitter.Panel1
@@ -845,7 +846,7 @@ namespace FlaxEditor.GUI.Timeline
             _timeIntervalsHeader = new TimeIntervalsHeader(this)
             {
                 AutoFocus = false,
-                BackgroundColor = Style.Current.Background.RGBMultiplied(0.9f),
+                BackgroundColor = style.Background.RGBMultiplied(0.9f),
                 AnchorPreset = AnchorPresets.HorizontalStretchTop,
                 Offsets = new Margin(0, 0, 0, HeaderTopAreaHeight),
                 Parent = _splitter.Panel2
@@ -854,7 +855,7 @@ namespace FlaxEditor.GUI.Timeline
             {
                 AutoFocus = false,
                 ClipChildren = false,
-                BackgroundColor = Style.Current.Background.RGBMultiplied(0.7f),
+                BackgroundColor = style.Background.RGBMultiplied(0.7f),
                 AnchorPreset = AnchorPresets.StretchAll,
                 Offsets = new Margin(0, 0, HeaderTopAreaHeight, 0),
                 Parent = _splitter.Panel2

Source/Editor/GUI/Timeline/Tracks/SingleMediaAssetTrack.cs

@@ -39,7 +39,7 @@ namespace FlaxEditor.GUI.Timeline.Tracks
                 if (AssetID == value?.ID)
                     return;
                 AssetID = value?.ID ?? Guid.Empty;
-                _picker.SelectedAsset = value;
+                _picker.Validator.SelectedAsset = value;
                 OnAssetChanged();
                 Timeline?.MarkAsEdited();
             }
@@ -63,10 +63,10 @@ namespace FlaxEditor.GUI.Timeline.Tracks
 
         private void OnPickerSelectedItemChanged()
         {
-            if (Asset == (TAsset)_picker.SelectedAsset)
+            if (Asset == (TAsset)_picker.Validator.SelectedAsset)
                 return;
             using (new TrackUndoBlock(this))
-                Asset = (TAsset)_picker.SelectedAsset;
+                Asset = (TAsset)_picker.Validator.SelectedAsset;
         }
 
         /// <summary>

Source/Editor/GUI/Tree/TreeNode.cs

@@ -776,11 +776,20 @@ namespace FlaxEditor.GUI.Tree
                 // Check if mouse hits arrow
                 if (_mouseOverArrow && HasAnyVisibleChild)
                 {
-                    // Toggle open state
-                    if (_opened)
-                        Collapse();
+                    if (ParentTree.Root.GetKey(KeyboardKeys.Alt))
+                    {
+                        if (_opened)
+                            CollapseAll();
+                        else
+                            ExpandAll();
+                    }
                     else
-                        Expand();
+                    {
+                        if (_opened)
+                            Collapse();
+                        else
+                            Expand();
+                    }
                 }
 
                 // Check if mouse hits bar

Source/Editor/Gizmo/IGizmoOwner.cs

@@ -11,6 +11,11 @@ namespace FlaxEditor.Gizmo
     [HideInEditor]
     public interface IGizmoOwner
     {
+        /// <summary>
+        /// Gets the gizmos collection.
+        /// </summary>
+        FlaxEditor.Viewport.EditorViewport Viewport { get; }
+
         /// <summary>
         /// Gets the gizmos collection.
         /// </summary>
@@ -101,5 +106,11 @@ namespace FlaxEditor.Gizmo
         /// </summary>
         /// <param name="nodes">The nodes to select</param>
         void Select(List<SceneGraph.SceneGraphNode> nodes);
+
+        /// <summary>
+        /// Spawns the actor in the viewport hierarchy.
+        /// </summary>
+        /// <param name="actor">The new actor to spawn.</param>
+        void Spawn(Actor actor);
     }
 }

Source/Editor/Gizmo/TransformGizmo.cs

@@ -111,7 +111,8 @@ namespace FlaxEditor.Gizmo
                     if (isSelected)
                     {
                         GetSelectedObjectsBounds(out var selectionBounds, out _);
-                        ray.Position = ray.GetPoint(selectionBounds.Size.Y * 0.5f);
+                        var offset = Mathf.Max(selectionBounds.Size.Y * 0.5f, 1.0f);
+                        ray.Position = ray.GetPoint(offset);
                         continue;
                     }
 
@@ -200,7 +201,21 @@ namespace FlaxEditor.Gizmo
                     ActorNode prefabRoot = GetPrefabRootInParent(actorNode);
                     if (prefabRoot != null && actorNode != prefabRoot)
                     {
-                        hit = WalkUpAndFindActorNodeBeforeSelection(actorNode, prefabRoot);
+                        bool isPrefabInSelection = false;
+                        foreach (var e in sceneEditing.Selection)
+                        {
+                            if (e is ActorNode ae && GetPrefabRootInParent(ae) == prefabRoot)
+                            {
+                                isPrefabInSelection = true;
+                                break;
+                            }
+                        }
+
+                        // Skip selecting prefab root if we already had object from that prefab selected
+                        if (!isPrefabInSelection)
+                        {
+                            hit = WalkUpAndFindActorNodeBeforeSelection(actorNode, prefabRoot);
+                        }
                     }
                 }
 

Source/Editor/Gizmo/TransformGizmoBase.cs

@@ -162,10 +162,23 @@ namespace FlaxEditor.Gizmo
 
             // Scale gizmo to fit on-screen
             Vector3 position = Position;
-            Vector3 vLength = Owner.ViewPosition - position;
-            float gizmoSize = Editor.Instance.Options.Options.Visual.GizmoSize;
-            _screenScale = (float)(vLength.Length / GizmoScaleFactor * gizmoSize);
-
+            if (Owner.Viewport.UseOrthographicProjection)
+            {
+                //[hack] this is far form ideal the View Position is in wrong location, any think using the View Position will have problem
+                //the camera system needs rewrite the to be a camera on springarm, similar how the ArcBallCamera is handled
+                //the ortho projection cannot exist with fps camera because there is no
+                // - focus point to calculate correct View Position with Orthographic Scale as a reference and Orthographic Scale from View Position
+                // with make the camera jump
+                // - and deaph so w and s movment in orto mode moves the cliping plane now
+                float gizmoSize = Editor.Instance.Options.Options.Visual.GizmoSize;
+                _screenScale = gizmoSize * (50 * Owner.Viewport.OrthographicScale);
+            }
+            else
+            {
+                Vector3 vLength = Owner.ViewPosition - position;
+                float gizmoSize = Editor.Instance.Options.Options.Visual.GizmoSize;
+                _screenScale = (float)(vLength.Length / GizmoScaleFactor * gizmoSize);
+            }
             // Setup world
             Quaternion orientation = GetSelectedObject(0).Orientation;
             _gizmoWorld = new Transform(position, orientation, new Float3(_screenScale));

Source/Editor/Managed/ManagedEditor.Internal.cpp

@@ -513,7 +513,9 @@ DEFINE_INTERNAL_CALL(void) EditorInternal_RunVisualScriptBreakpointLoopTick(floa
         WindowsManager::WindowsLocker.Unlock();
     }
     WindowsManager::WindowsLocker.Lock();
-    for (auto& win : WindowsManager::Windows)
+    Array<Window*, InlinedAllocation<32>> windows;
+    windows.Add(WindowsManager::Windows);
+    for (Window* win : windows)
     {
         if (win->IsVisible())
             win->OnUpdate(deltaTime);
@@ -524,133 +526,6 @@ DEFINE_INTERNAL_CALL(void) EditorInternal_RunVisualScriptBreakpointLoopTick(floa
     Engine::OnDraw();
 }
 
-struct VisualScriptLocalManaged
-{
-    MString* Value;
-    MString* ValueTypeName;
-    uint32 NodeId;
-    int32 BoxId;
-};
-
-DEFINE_INTERNAL_CALL(MArray*) EditorInternal_GetVisualScriptLocals(int* localsCount)
-{
-    MArray* result = nullptr;
-    *localsCount = 0;
-    const auto stack = VisualScripting::GetThreadStackTop();
-    if (stack && stack->Scope)
-    {
-        const int32 count = stack->Scope->Parameters.Length() + stack->Scope->ReturnedValues.Count();
-        const MClass* mclass = ((NativeBinaryModule*)GetBinaryModuleFlaxEngine())->Assembly->GetClass("FlaxEditor.Editor+VisualScriptLocal");
-        ASSERT(mclass);
-        result = MCore::Array::New(mclass, count);
-        VisualScriptLocalManaged local;
-        local.NodeId = MAX_uint32;
-        if (stack->Scope->Parameters.Length() != 0)
-        {
-            auto s = stack;
-            while (s->PreviousFrame && s->PreviousFrame->Scope == stack->Scope)
-                s = s->PreviousFrame;
-            if (s)
-                local.NodeId = s->Node->ID;
-        }
-        VisualScriptLocalManaged* resultPtr = MCore::Array::GetAddress<VisualScriptLocalManaged>(result);
-        for (int32 i = 0; i < stack->Scope->Parameters.Length(); i++)
-        {
-            auto& v = stack->Scope->Parameters[i];
-            local.BoxId = i + 1;
-            local.Value = MUtils::ToString(v.ToString());
-            local.ValueTypeName = MUtils::ToString(v.Type.GetTypeName());
-            resultPtr[i] = local;
-        }
-        for (int32 i = 0; i < stack->Scope->ReturnedValues.Count(); i++)
-        {
-            auto& v = stack->Scope->ReturnedValues[i];
-            local.NodeId = v.NodeId;
-            local.BoxId = v.BoxId;
-            local.Value = MUtils::ToString(v.Value.ToString());
-            local.ValueTypeName = MUtils::ToString(v.Value.Type.GetTypeName());
-            resultPtr[stack->Scope->Parameters.Length() + i] = local;
-        }
-        *localsCount = count;
-    }
-    return result;
-}
-
-struct VisualScriptStackFrameManaged
-{
-    MObject* Script;
-    uint32 NodeId;
-    int32 BoxId;
-};
-
-DEFINE_INTERNAL_CALL(MArray*) EditorInternal_GetVisualScriptStackFrames(int* stackFramesCount)
-{
-    MArray* result = nullptr;
-    *stackFramesCount = 0;
-    const auto stack = VisualScripting::GetThreadStackTop();
-    if (stack)
-    {
-        int32 count = 0;
-        auto s = stack;
-        while (s)
-        {
-            s = s->PreviousFrame;
-            count++;
-        }
-        const MClass* mclass = ((NativeBinaryModule*)GetBinaryModuleFlaxEngine())->Assembly->GetClass("FlaxEditor.Editor+VisualScriptStackFrame");
-        ASSERT(mclass);
-        result = MCore::Array::New(mclass, count);
-        VisualScriptStackFrameManaged* resultPtr = MCore::Array::GetAddress<VisualScriptStackFrameManaged>(result);
-        s = stack;
-        count = 0;
-        while (s)
-        {
-            VisualScriptStackFrameManaged frame;
-            frame.Script = s->Script->GetOrCreateManagedInstance();
-            frame.NodeId = s->Node->ID;
-            frame.BoxId = s->Box ? s->Box->ID : MAX_uint32;
-            resultPtr[count] = frame;
-            s = s->PreviousFrame;
-            count++;
-        }
-        *stackFramesCount = count;
-    }
-    return result;
-}
-
-DEFINE_INTERNAL_CALL(VisualScriptStackFrameManaged) EditorInternal_GetVisualScriptPreviousScopeFrame()
-{
-    VisualScriptStackFrameManaged frame;
-    Platform::MemoryClear(&frame, sizeof(frame));
-    const auto stack = VisualScripting::GetThreadStackTop();
-    if (stack)
-    {
-        auto s = stack;
-        while (s->PreviousFrame && s->PreviousFrame->Scope == stack->Scope)
-            s = s->PreviousFrame;
-        if (s && s->PreviousFrame)
-        {
-            s = s->PreviousFrame;
-            frame.Script = s->Script->GetOrCreateManagedInstance();
-            frame.NodeId = s->Node->ID;
-            frame.BoxId = s->Box ? s->Box->ID : MAX_uint32;
-        }
-    }
-    return frame;
-}
-
-DEFINE_INTERNAL_CALL(bool) EditorInternal_EvaluateVisualScriptLocal(VisualScript* script, VisualScriptLocalManaged* local)
-{
-    Variant v;
-    if (VisualScripting::Evaluate(script, VisualScripting::GetThreadStackTop()->Instance, local->NodeId, local->BoxId, v))
-    {
-        local->Value = MUtils::ToString(v.ToString());
-        local->ValueTypeName = MUtils::ToString(v.Type.GetTypeName());
-        return true;
-    }
-    return false;
-}
-
 DEFINE_INTERNAL_CALL(void) EditorInternal_DeserializeSceneObject(SceneObject* sceneObject, MString* jsonObj)
 {
     PROFILE_CPU_NAMED("DeserializeSceneObject");
@@ -767,7 +642,7 @@ bool ManagedEditor::TryRestoreImportOptions(ModelTool::Options& options, String
 
     // Get options from model
     FileSystem::NormalizePath(assetPath);
-    return ImportModelFile::TryGetImportOptions(assetPath, options);
+    return ImportModel::TryGetImportOptions(assetPath, options);
 }
 
 bool ManagedEditor::Import(const String& inputPath, const String& outputPath, const AudioTool::Options& options)

Source/Editor/Managed/ManagedEditor.cpp

@@ -330,14 +330,15 @@ bool ManagedEditor::CanReloadScripts()
 
 bool ManagedEditor::CanAutoBuildCSG()
 {
+    if (!ManagedEditorOptions.AutoRebuildCSG)
+        return false;
+
     // Skip calls from non-managed thread (eg. physics worker)
     if (!MCore::Thread::IsAttached())
         return false;
 
     if (!HasManagedInstance())
         return false;
-    if (!ManagedEditorOptions.AutoRebuildCSG)
-        return false;
     if (Internal_CanAutoBuildCSG == nullptr)
     {
         Internal_CanAutoBuildCSG = GetClass()->GetMethod("Internal_CanAutoBuildCSG");
@@ -348,14 +349,15 @@ bool ManagedEditor::CanAutoBuildCSG()
 
 bool ManagedEditor::CanAutoBuildNavMesh()
 {
+    if (!ManagedEditorOptions.AutoRebuildNavMesh)
+        return false;
+
     // Skip calls from non-managed thread (eg. physics worker)
     if (!MCore::Thread::IsAttached())
         return false;
 
     if (!HasManagedInstance())
         return false;
-    if (!ManagedEditorOptions.AutoRebuildNavMesh)
-        return false;
     if (Internal_CanAutoBuildNavMesh == nullptr)
     {
         Internal_CanAutoBuildNavMesh = GetClass()->GetMethod("Internal_CanAutoBuildNavMesh");
@@ -487,6 +489,95 @@ void ManagedEditor::RequestStartPlayOnEditMode()
     Internal_RequestStartPlayOnEditMode->Invoke(GetManagedInstance(), nullptr, nullptr);
 }
 
+Array<ManagedEditor::VisualScriptStackFrame> ManagedEditor::GetVisualScriptStackFrames()
+{
+    Array<VisualScriptStackFrame> result;
+    const auto stack = VisualScripting::GetThreadStackTop();
+    auto s = stack;
+    while (s)
+    {
+        VisualScriptStackFrame& frame = result.AddOne();
+        frame.Script = s->Script;
+        frame.NodeId = s->Node->ID;
+        frame.BoxId = s->Box ? s->Box->ID : MAX_uint32;
+        s = s->PreviousFrame;
+    }
+    return result;
+}
+
+ManagedEditor::VisualScriptStackFrame ManagedEditor::GetVisualScriptPreviousScopeFrame()
+{
+    VisualScriptStackFrame frame;
+    Platform::MemoryClear(&frame, sizeof(frame));
+    const auto stack = VisualScripting::GetThreadStackTop();
+    if (stack)
+    {
+        auto s = stack;
+        while (s->PreviousFrame && s->PreviousFrame->Scope == stack->Scope)
+            s = s->PreviousFrame;
+        if (s && s->PreviousFrame)
+        {
+            s = s->PreviousFrame;
+            frame.Script = s->Script;
+            frame.NodeId = s->Node->ID;
+            frame.BoxId = s->Box ? s->Box->ID : MAX_uint32;
+        }
+    }
+    return frame;
+}
+
+Array<ManagedEditor::VisualScriptLocal> ManagedEditor::GetVisualScriptLocals()
+{
+    Array<VisualScriptLocal> result;
+    const auto stack = VisualScripting::GetThreadStackTop();
+    if (stack && stack->Scope)
+    {
+        const int32 count = stack->Scope->Parameters.Length() + stack->Scope->ReturnedValues.Count();
+        result.Resize(count);
+        VisualScriptLocal local;
+        local.NodeId = MAX_uint32;
+        if (stack->Scope->Parameters.Length() != 0)
+        {
+            auto s = stack;
+            while (s->PreviousFrame && s->PreviousFrame->Scope == stack->Scope)
+                s = s->PreviousFrame;
+            if (s)
+                local.NodeId = s->Node->ID;
+        }
+        for (int32 i = 0; i < stack->Scope->Parameters.Length(); i++)
+        {
+            auto& v = stack->Scope->Parameters[i];
+            local.BoxId = i + 1;
+            local.Value = v.ToString();
+            local.ValueTypeName = v.Type.GetTypeName();
+            result[i] = local;
+        }
+        for (int32 i = 0; i < stack->Scope->ReturnedValues.Count(); i++)
+        {
+            auto& v = stack->Scope->ReturnedValues[i];
+            local.NodeId = v.NodeId;
+            local.BoxId = v.BoxId;
+            local.Value = v.Value.ToString();
+            local.ValueTypeName = v.Value.Type.GetTypeName();
+            result[stack->Scope->Parameters.Length() + i] = local;
+        }
+    }
+    return result;
+}
+
+bool ManagedEditor::EvaluateVisualScriptLocal(VisualScript* script, VisualScriptLocal& local)
+{
+    Variant v;
+    const auto stack = VisualScripting::GetThreadStackTop();
+    if (stack && VisualScripting::Evaluate(script, stack->Instance, local.NodeId, local.BoxId, v))
+    {
+        local.Value = v.ToString();
+        local.ValueTypeName = v.Type.GetTypeName();
+        return true;
+    }
+    return false;
+}
+
 void ManagedEditor::OnEditorAssemblyLoaded(MAssembly* assembly)
 {
     ASSERT(!HasManagedInstance());

Source/Editor/Managed/ManagedEditor.h

@@ -210,6 +210,31 @@ public:
     API_FUNCTION() static bool TryRestoreImportOptions(API_PARAM(Ref) AudioTool::Options& options, String assetPath);
 #endif
 
+public:
+    API_STRUCT(Internal, NoDefault) struct VisualScriptStackFrame
+    {
+        DECLARE_SCRIPTING_TYPE_MINIMAL(VisualScriptStackFrame);
+
+        API_FIELD() class VisualScript* Script;
+        API_FIELD() uint32 NodeId;
+        API_FIELD() int32 BoxId;
+    };
+
+    API_STRUCT(Internal, NoDefault) struct VisualScriptLocal
+    {
+        DECLARE_SCRIPTING_TYPE_MINIMAL(VisualScriptLocal);
+
+        API_FIELD() String Value;
+        API_FIELD() String ValueTypeName;
+        API_FIELD() uint32 NodeId;
+        API_FIELD() int32 BoxId;
+    };
+
+    API_FUNCTION(Internal) static Array<VisualScriptStackFrame> GetVisualScriptStackFrames();
+    API_FUNCTION(Internal) static VisualScriptStackFrame GetVisualScriptPreviousScopeFrame();
+    API_FUNCTION(Internal) static Array<VisualScriptLocal> GetVisualScriptLocals();
+    API_FUNCTION(Internal) static bool EvaluateVisualScriptLocal(VisualScript* script, API_PARAM(Ref) VisualScriptLocal& local);
+
 private:
     void OnEditorAssemblyLoaded(MAssembly* assembly);
 

Source/Editor/Modules/ContentDatabaseModule.cs

@@ -196,6 +196,25 @@ namespace FlaxEditor.Modules
 
             return null;
         }
+        /// <summary>
+        /// Gets the virtual proxy object from given path.
+        /// <br></br>use case if the asset u trying to display is not a flax asset but u like to add custom functionality
+        /// <br></br>to context menu,or display it the asset
+        /// </summary>
+        /// <param name="path">The asset path.</param>
+        /// <returns>Asset proxy or null if cannot find.</returns>
+        public AssetProxy GetAssetVirtuallProxy(string path)
+        {
+            for (int i = 0; i < Proxy.Count; i++)
+            {
+                if (Proxy[i] is AssetProxy proxy && proxy.IsVirtualProxy() && path.EndsWith(proxy.FileExtension, StringComparison.OrdinalIgnoreCase))
+                {
+                    return proxy;
+                }
+            }
+
+            return null;
+        }
 
         /// <summary>
         /// Refreshes the given item folder. Tries to find new content items and remove not existing ones.
@@ -811,10 +830,9 @@ namespace FlaxEditor.Modules
         {
             if (node == null)
                 return;
-
-            // Temporary data
             var folder = node.Folder;
             var path = folder.Path;
+            var canHaveAssets = node.CanHaveAssets;
 
             if (_isDuringFastSetup)
             {
@@ -833,20 +851,38 @@ namespace FlaxEditor.Modules
                     var child = folder.Children[i];
                     if (!child.Exists)
                     {
-                        // Send info
+                        // Item doesn't exist anymore
                         Editor.Log(string.Format($"Content item \'{child.Path}\' has been removed"));
-
-                        // Destroy it
                         Delete(child, false);
-
                         i--;
                     }
+                    else if (canHaveAssets && child is AssetItem childAsset)
+                    {
+                        // Check if asset type doesn't match the item proxy (eg. item reimported as Material Instance instead of Material)
+                        if (FlaxEngine.Content.GetAssetInfo(child.Path, out var assetInfo))
+                        {
+                            bool changed = assetInfo.ID != childAsset.ID;
+                            if (!changed && assetInfo.TypeName != childAsset.TypeName)
+                            {
+                                // Use proxy check (eg. scene asset might accept different typename than AssetInfo reports)
+                                var proxy = GetAssetProxy(childAsset.TypeName, child.Path);
+                                if (proxy == null)
+                                    proxy = GetAssetProxy(assetInfo.TypeName, child.Path);
+                                changed = !proxy.AcceptsAsset(assetInfo.TypeName, child.Path);
+                            }
+                            if (changed)
+                            {
+                                OnAssetTypeInfoChanged(childAsset, ref assetInfo);
+                                i--;
+                            }
+                        }
+                    }
                 }
             }
 
             // Find files
             var files = Directory.GetFiles(path, "*.*", SearchOption.TopDirectoryOnly);
-            if (node.CanHaveAssets)
+            if (canHaveAssets)
             {
                 LoadAssets(node, files);
             }
@@ -979,7 +1015,14 @@ namespace FlaxEditor.Modules
                         item = proxy?.ConstructItem(path, assetInfo.TypeName, ref assetInfo.ID);
                     }
                     if (item == null)
-                        item = new FileItem(path);
+                    {
+                        var proxy = GetAssetVirtuallProxy(path);
+                        item = proxy?.ConstructItem(path, assetInfo.TypeName, ref assetInfo.ID);
+                        if (item == null)
+                        {
+                            item = new FileItem(path);
+                        }
+                    }
 
                     // Link
                     item.ParentFolder = parent.Folder;
@@ -1157,19 +1200,8 @@ namespace FlaxEditor.Modules
                     // For eg. change texture to sprite atlas on reimport
                     if (binaryAssetItem.TypeName != assetInfo.TypeName)
                     {
-                        // Asset type has been changed!
-                        Editor.LogWarning(string.Format("Asset \'{0}\' changed type from {1} to {2}", item.Path, binaryAssetItem.TypeName, assetInfo.TypeName));
-                        Editor.Windows.CloseAllEditors(item);
-
-                        // Remove this item from the database and some related data
                         var toRefresh = binaryAssetItem.ParentFolder;
-                        binaryAssetItem.Dispose();
-                        toRefresh.Children.Remove(binaryAssetItem);
-                        if (!binaryAssetItem.HasDefaultThumbnail)
-                        {
-                            // Delete old thumbnail and remove it from the cache
-                            Editor.Instance.Thumbnails.DeletePreview(binaryAssetItem);
-                        }
+                        OnAssetTypeInfoChanged(binaryAssetItem, ref assetInfo);
 
                         // Refresh the parent folder to find the new asset (it should have different type or some other format)
                         RefreshFolder(toRefresh, false);
@@ -1186,6 +1218,23 @@ namespace FlaxEditor.Modules
             }
         }
 
+        private void OnAssetTypeInfoChanged(AssetItem assetItem, ref AssetInfo assetInfo)
+        {
+            // Asset type has been changed!
+            Editor.LogWarning(string.Format("Asset \'{0}\' changed type from {1} to {2}", assetItem.Path, assetItem.TypeName, assetInfo.TypeName));
+            Editor.Windows.CloseAllEditors(assetItem);
+
+            // Remove this item from the database and some related data
+            assetItem.Dispose();
+            assetItem.ParentFolder.Children.Remove(assetItem);
+
+            // Delete old thumbnail and remove it from the cache
+            if (!assetItem.HasDefaultThumbnail)
+            {
+                Editor.Instance.Thumbnails.DeletePreview(assetItem);
+            }
+        }
+
         internal void OnDirectoryEvent(MainContentTreeNode node, FileSystemEventArgs e)
         {
             // Ensure to be ready for external events

Source/Editor/Modules/ContentImportingModule.cs

@@ -126,29 +126,35 @@ namespace FlaxEditor.Modules
         {
             if (item != null && !item.GetImportPath(out string importPath))
             {
-                // Check if input file is missing
-                if (!System.IO.File.Exists(importPath))
-                {
-                    Editor.LogWarning(string.Format("Cannot reimport asset \'{0}\'. File \'{1}\' does not exist.", item.Path, importPath));
-                    if (skipSettingsDialog)
-                        return;
-
-                    // Ask user to select new file location
-                    var title = string.Format("Please find missing \'{0}\' file for asset \'{1}\'", importPath, item.ShortName);
-                    if (FileSystem.ShowOpenFileDialog(Editor.Windows.MainWindow, null, "All files (*.*)\0*.*\0", false, title, out var files))
-                        return;
-                    if (files != null && files.Length > 0)
-                        importPath = files[0];
-
-                    // Validate file path again
-                    if (!System.IO.File.Exists(importPath))
-                        return;
-                }
-
+                if (GetReimportPath(item.ShortName, ref importPath, skipSettingsDialog))
+                    return;
                 Import(importPath, item.Path, true, skipSettingsDialog, settings);
             }
         }
 
+        internal bool GetReimportPath(string contextName, ref string importPath, bool skipSettingsDialog = false)
+        {
+            // Check if input file is missing
+            if (!System.IO.File.Exists(importPath))
+            {
+                Editor.LogWarning(string.Format("Cannot reimport asset \'{0}\'. File \'{1}\' does not exist.", contextName, importPath));
+                if (skipSettingsDialog)
+                    return true;
+
+                // Ask user to select new file location
+                var title = string.Format("Please find missing \'{0}\' file for asset \'{1}\'", importPath, contextName);
+                if (FileSystem.ShowOpenFileDialog(Editor.Windows.MainWindow, null, "All files (*.*)\0*.*\0", false, title, out var files))
+                    return true;
+                if (files != null && files.Length > 0)
+                    importPath = files[0];
+
+                // Validate file path again
+                if (!System.IO.File.Exists(importPath))
+                    return true;
+            }
+            return false;
+        }
+
         /// <summary>
         /// Imports the specified files.
         /// </summary>

Source/Editor/Modules/PrefabsModule.cs

@@ -124,6 +124,7 @@ namespace FlaxEditor.Modules
                 if (!Editor.StateMachine.CurrentState.CanEditScene)
                     return;
                 undo = Editor.Undo;
+                Editor.Scene.MarkSceneEdited(actor.Scene);
             }
 
             // Record undo for prefab creating (backend links the target instance with the prefab)

Source/Editor/Modules/SceneModule.cs

@@ -242,7 +242,6 @@ namespace FlaxEditor.Modules
         /// <param name="additive">True if don't close opened scenes and just add new scene to them, otherwise will release current scenes and load single one.</param>
         public void OpenScene(Guid sceneId, bool additive = false)
         {
-            // Check if cannot change scene now
             if (!Editor.StateMachine.CurrentState.CanChangeScene)
                 return;
 
@@ -266,13 +265,35 @@ namespace FlaxEditor.Modules
             Editor.StateMachine.ChangingScenesState.LoadScene(sceneId, additive);
         }
 
+        /// <summary>
+        /// Reload all loaded scenes.
+        /// </summary>
+        public void ReloadScenes()
+        {
+            if (!Editor.StateMachine.CurrentState.CanChangeScene)
+                return;
+
+            if (!Editor.IsPlayMode)
+            {
+                if (CheckSaveBeforeClose())
+                    return;
+            }
+
+            // Reload scenes
+            foreach (var scene in Level.Scenes)
+            {
+                var sceneId = scene.ID;
+                Level.UnloadScene(scene);
+                Level.LoadScene(sceneId);
+            }
+        }
+
         /// <summary>
         /// Closes scene (async).
         /// </summary>
         /// <param name="scene">The scene.</param>
         public void CloseScene(Scene scene)
         {
-            // Check if cannot change scene now
             if (!Editor.StateMachine.CurrentState.CanChangeScene)
                 return;
 
@@ -296,7 +317,6 @@ namespace FlaxEditor.Modules
         /// </summary>
         public void CloseAllScenes()
         {
-            // Check if cannot change scene now
             if (!Editor.StateMachine.CurrentState.CanChangeScene)
                 return;
 
@@ -321,7 +341,6 @@ namespace FlaxEditor.Modules
         /// <param name="scene">The scene to not close.</param>
         public void CloseAllScenesExcept(Scene scene)
         {
-            // Check if cannot change scene now
             if (!Editor.StateMachine.CurrentState.CanChangeScene)
                 return;