Merge branch 'master' into mac

Source/Editor/Cooker/CookingData.h

@@ -137,7 +137,7 @@ extern FLAXENGINE_API const Char* ToString(const BuildConfiguration configuratio
 /// <summary>
 /// Game cooking temporary data.
 /// </summary>
-API_CLASS(Sealed, Namespace="FlaxEditor") class FLAXENGINE_API CookingData : public PersistentScriptingObject
+API_CLASS(Sealed, Namespace="FlaxEditor") class FLAXENGINE_API CookingData : public ScriptingObject
 {
 DECLARE_SCRIPTING_TYPE(CookingData);
 public:

Source/Editor/Cooker/GameCooker.cpp

@@ -171,7 +171,7 @@ CookingData::Statistics::Statistics()
 }
 
 CookingData::CookingData(const SpawnParams& params)
-    : PersistentScriptingObject(params)
+    : ScriptingObject(params)
 {
 }
 

Source/Editor/Cooker/Platform/UWP/UWPPlatformTools.cpp

@@ -179,12 +179,12 @@ bool UWPPlatformTools::OnDeployBinaries(CookingData& data)
         if (file)
         {
             auto now = DateTime::Now();
-            file->WriteTextFormatted(
+            file->WriteText(StringAnsi::Format(
                 fileTemplate.Get()
                 , gameSettings->ProductName.ToStringAnsi()
                 , gameSettings->CompanyName.ToStringAnsi()
                 , now.GetYear()
-            );
+            ));
             hasError = file->HasError();
             Delete(file);
         }
@@ -210,10 +210,10 @@ bool UWPPlatformTools::OnDeployBinaries(CookingData& data)
         bool hasError = true;
         if (file)
         {
-            file->WriteTextFormatted(
+            file->WriteText(StringAnsi::Format(
                 fileTemplate.Get()
                 , defaultNamespace.ToStringAnsi() // {0} Default Namespace
-            );
+            ));
             hasError = file->HasError();
             Delete(file);
         }
@@ -264,11 +264,11 @@ bool UWPPlatformTools::OnDeployBinaries(CookingData& data)
         bool hasError = true;
         if (file)
         {
-            file->WriteTextFormatted(
+            file->WriteText(StringAnsi::Format(
                 fileTemplate.Get()
                 , autoRotationPreferences.Get()
                 , preferredLaunchWindowingMode.Get()
-            );
+            ));
             hasError = file->HasError();
             Delete(file);
         }
@@ -296,12 +296,12 @@ bool UWPPlatformTools::OnDeployBinaries(CookingData& data)
         bool hasError = true;
         if (file)
         {
-            file->WriteTextFormatted(
+            file->WriteText(StringAnsi::Format(
                 fileTemplate.Get()
                 , projectName.ToStringAnsi() // {0} Project Name
                 , mode // {1} Platform Mode
                 , projectGuid.ToStringAnsi() // {2} Project ID
-            );
+            ));
             hasError = file->HasError();
             Delete(file);
         }
@@ -344,14 +344,14 @@ bool UWPPlatformTools::OnDeployBinaries(CookingData& data)
         bool hasError = true;
         if (file)
         {
-            file->WriteTextFormatted(
+            file->WriteText(StringAnsi::Format(
                 fileTemplate.Get()
                 , projectName.ToStringAnsi() // {0} Project Name
                 , mode // {1} Platform Mode
                 , projectGuid.Get() // {2} Project ID
                 , filesInclude.ToString().ToStringAnsi() // {3} Files to include
                 , defaultNamespace.ToStringAnsi() // {4} Default Namespace
-            );
+            ));
             hasError = file->HasError();
             Delete(file);
         }
@@ -394,13 +394,13 @@ bool UWPPlatformTools::OnDeployBinaries(CookingData& data)
         bool hasError = true;
         if (file)
         {
-            file->WriteTextFormatted(
+            file->WriteText(StringAnsi::Format(
                 fileTemplate.Get()
                 , projectName.ToStringAnsi() // {0} Display Name
                 , gameSettings->CompanyName.ToStringAnsi() // {1} Company Name
                 , productId.ToStringAnsi() // {2} Product ID
                 , defaultNamespace.ToStringAnsi() // {3} Default Namespace
-            );
+            ));
             hasError = file->HasError();
             Delete(file);
         }

Source/Editor/CustomEditors/SyncPointEditor.cs

@@ -102,6 +102,16 @@ namespace FlaxEditor.CustomEditors
         /// </summary>
         protected virtual void OnModified()
         {
+            var parent = ParentEditor;
+            while (parent != null)
+            {
+                if (parent is SyncPointEditor syncPointEditor)
+                {
+                    syncPointEditor.OnModified();
+                    break;
+                }
+                parent = parent.ParentEditor;
+            }
         }
 
         /// <inheritdoc />

Source/Editor/GUI/Timeline/AnimationTimeline.cs

@@ -52,7 +52,7 @@ namespace FlaxEditor.GUI.Timeline
         /// </summary>
         /// <param name="undo">The undo/redo to use for the history actions recording. Optional, can be null to disable undo support.</param>
         public AnimationTimeline(FlaxEditor.Undo undo)
-        : base(PlaybackButtons.Play | PlaybackButtons.Stop, undo, false, false)
+        : base(PlaybackButtons.Play | PlaybackButtons.Stop, undo, false, true)
         {
             PlaybackState = PlaybackStates.Seeking;
             ShowPreviewValues = false;
@@ -61,6 +61,7 @@ namespace FlaxEditor.GUI.Timeline
             // Setup track types
             TrackArchetypes.Add(AnimationChannelTrack.GetArchetype());
             TrackArchetypes.Add(AnimationChannelDataTrack.GetArchetype());
+            TrackArchetypes.Add(AnimationEventTrack.GetArchetype());
         }
 
         /// <summary>

Source/Editor/GUI/Timeline/GUI/Background.cs

@@ -16,8 +16,8 @@ namespace FlaxEditor.GUI.Timeline.GUI
         private readonly Timeline _timeline;
         private float[] _tickSteps;
         private float[] _tickStrengths;
-        private bool _leftMouseDown;
+        private bool _isSelecting;
-        private Vector2 _leftMouseDownPos = Vector2.Minimum;
+        private Vector2 _selectingStartPos = Vector2.Minimum;
         private Vector2 _mousePos = Vector2.Minimum;
 
         /// <summary>
@@ -33,7 +33,7 @@ namespace FlaxEditor.GUI.Timeline.GUI
 
         private void UpdateSelectionRectangle()
         {
-            var selectionRect = Rectangle.FromPoints(_leftMouseDownPos, _mousePos);
+            var selectionRect = Rectangle.FromPoints(_selectingStartPos, _mousePos);
             _timeline.OnKeyframesSelection(null, this, selectionRect);
         }
 
@@ -41,20 +41,17 @@ namespace FlaxEditor.GUI.Timeline.GUI
         public override bool OnMouseDown(Vector2 location, MouseButton button)
         {
             if (base.OnMouseDown(location, button))
-            {
-                _leftMouseDown = false;
                 return true;
-            }
 
             _mousePos = location;
             if (button == MouseButton.Left)
             {
                 // Start selecting
-                _leftMouseDown = true;
+                _isSelecting = true;
-                _leftMouseDownPos = location;
+                _selectingStartPos = location;
-                StartMouseCapture();
                 _timeline.OnKeyframesDeselect(null);
                 Focus();
+                StartMouseCapture();
                 return true;
             }
 
@@ -65,19 +62,16 @@ namespace FlaxEditor.GUI.Timeline.GUI
         public override bool OnMouseUp(Vector2 location, MouseButton button)
         {
             _mousePos = location;
-
+            if (_isSelecting && button == MouseButton.Left)
-            if (_leftMouseDown && button == MouseButton.Left)
             {
                 // End selecting
-                _leftMouseDown = false;
+                _isSelecting = false;
                 EndMouseCapture();
+                return true;
             }
 
             if (base.OnMouseUp(location, button))
-            {
-                _leftMouseDown = false;
                 return true;
-            }
 
             return true;
         }
@@ -88,7 +82,7 @@ namespace FlaxEditor.GUI.Timeline.GUI
             _mousePos = location;
 
             // Selecting
-            if (_leftMouseDown)
+            if (_isSelecting)
             {
                 UpdateSelectionRectangle();
                 return;
@@ -100,11 +94,24 @@ namespace FlaxEditor.GUI.Timeline.GUI
         /// <inheritdoc />
         public override void OnLostFocus()
         {
-            _leftMouseDown = false;
+            if (_isSelecting)
+            {
+                _isSelecting = false;
+                EndMouseCapture();
+            }
 
             base.OnLostFocus();
         }
 
+        /// <inheritdoc />
+        public override void OnEndMouseCapture()
+        {
+            _isSelecting = false;
+            EndMouseCapture();
+
+            base.OnEndMouseCapture();
+        }
+
         /// <inheritdoc />
         public override bool IntersectsContent(ref Vector2 locationParent, out Vector2 location)
         {
@@ -217,9 +224,9 @@ namespace FlaxEditor.GUI.Timeline.GUI
             }
 
             // Draw selection rectangle
-            if (_leftMouseDown)
+            if (_isSelecting)
             {
-                var selectionRect = Rectangle.FromPoints(_leftMouseDownPos, _mousePos);
+                var selectionRect = Rectangle.FromPoints(_selectingStartPos, _mousePos);
                 Render2D.FillRectangle(selectionRect, Color.Orange * 0.4f);
                 Render2D.DrawRectangle(selectionRect, Color.Orange);
             }

Source/Editor/GUI/Timeline/Media.cs

@@ -91,7 +91,7 @@ namespace FlaxEditor.GUI.Timeline
             /// <param name="media">The media.</param>
             protected ProxyBase(TTrack track, TMedia media)
             {
-                Track = track ?? throw new ArgumentNullException(nameof(track));
+                Track = track;
                 Media = media ?? throw new ArgumentNullException(nameof(media));
             }
         }
@@ -215,7 +215,7 @@ namespace FlaxEditor.GUI.Timeline
         /// <summary>
         /// Gets a value indicating whether this media can be resized (duration changed).
         /// </summary>
-        public bool CanResize;
+        public bool CanResize = true;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="Media"/> class.
@@ -229,8 +229,9 @@ namespace FlaxEditor.GUI.Timeline
         /// Called when showing timeline context menu to the user. Can be used to add custom buttons.
         /// </summary>
         /// <param name="menu">The menu.</param>
+        /// <param name="time">The time (in seconds) at which context menu is shown (user clicked on a timeline).</param>
         /// <param name="controlUnderMouse">The found control under the mouse cursor.</param>
-        public virtual void OnTimelineShowContextMenu(ContextMenu.ContextMenu menu, Control controlUnderMouse)
+        public virtual void OnTimelineContextMenu(ContextMenu.ContextMenu menu, float time, Control controlUnderMouse)
         {
             if (CanDelete && Track.Media.Count > Track.MinMediaCount)
                 menu.AddButton("Delete media", Delete);
@@ -341,14 +342,15 @@ namespace FlaxEditor.GUI.Timeline
             var style = Style.Current;
             var bounds = new Rectangle(Vector2.Zero, Size);
 
-            var fillColor = style.Background * 1.5f;
+            var fillColor = BackgroundColor.A > 0.0f ? BackgroundColor : style.Background * 1.5f;
             Render2D.FillRectangle(bounds, fillColor);
 
             var isMovingWholeMedia = _isMoving && !_startMoveRightEdge && !_startMoveLeftEdge;
             var borderHighlightColor = style.BorderHighlighted;
             var moveColor = style.ProgressNormal;
+            var selectedColor = style.BackgroundSelected;
             var moveThickness = 2.0f;
-            var borderColor = isMovingWholeMedia ? moveColor : (IsMouseOver ? borderHighlightColor : style.BorderNormal);
+            var borderColor = isMovingWholeMedia ? moveColor : (Timeline.SelectedMedia.Contains(this) ? selectedColor : (IsMouseOver ? borderHighlightColor : style.BorderNormal));
             Render2D.DrawRectangle(bounds, borderColor, isMovingWholeMedia ? moveThickness : 1.0f);
             if (_startMoveLeftEdge)
             {
@@ -384,9 +386,26 @@ namespace FlaxEditor.GUI.Timeline
                 _startMoveDuration = DurationFrames;
                 _startMoveLeftEdge = MoveLeftEdgeRect.Contains(ref location) && CanResize;
                 _startMoveRightEdge = MoveRightEdgeRect.Contains(ref location) && CanResize;
-
                 StartMouseCapture(true);
+                if (_startMoveLeftEdge || _startMoveRightEdge)
+                    return true;
 
+                if (Root.GetKey(KeyboardKeys.Control))
+                {
+                    // Add/Remove selection
+                    if (_timeline.SelectedMedia.Contains(this))
+                        _timeline.Deselect(this);
+                    else
+                        _timeline.Select(this, true);
+                }
+                else
+                {
+                    // Select
+                    if (!_timeline.SelectedMedia.Contains(this))
+                        _timeline.Select(this);
+                }
+
+                _timeline.OnKeyframesMove(null, this, location, true, false);
                 return true;
             }
 
@@ -417,7 +436,8 @@ namespace FlaxEditor.GUI.Timeline
                 }
                 else
                 {
-                    StartFrame = _startMoveStartFrame + moveDelta;
+                    // Move with global timeline selection
+                    _timeline.OnKeyframesMove(null, this, location, false, false);
                 }
 
                 if (StartFrame != startFrame || DurationFrames != durationFrames)
@@ -436,6 +456,15 @@ namespace FlaxEditor.GUI.Timeline
         {
             if (button == MouseButton.Left && _isMoving)
             {
+                if (!_startMoveLeftEdge && !_startMoveRightEdge && !Root.GetKey(KeyboardKeys.Control))
+                {
+                    var moveLocationDelta = Root.MousePosition - _startMoveLocation;
+                    if (moveLocationDelta.Length < 4.0f)
+                    {
+                        // No move so just select itself
+                        _timeline.Select(this);
+                    }
+                }
                 EndMoving();
                 return true;
             }
@@ -443,6 +472,20 @@ namespace FlaxEditor.GUI.Timeline
             return base.OnMouseUp(location, button);
         }
 
+        /// <inheritdoc />
+        public override bool OnMouseDoubleClick(Vector2 location, MouseButton button)
+        {
+            if (base.OnMouseDoubleClick(location, button))
+                return true;
+
+            if (PropertiesEditObject != null)
+            {
+                Timeline.ShowEditPopup(PropertiesEditObject, PointToParent(Timeline, location), Track);
+                return true;
+            }
+            return false;
+        }
+
         /// <inheritdoc />
         public override void OnEndMouseCapture()
         {
@@ -484,6 +527,8 @@ namespace FlaxEditor.GUI.Timeline
         private void EndMoving()
         {
             _isMoving = false;
+            if (_startMoveLeftEdge || _startMoveRightEdge)
+            {
                 _startMoveLeftEdge = false;
                 _startMoveRightEdge = false;
 
@@ -500,6 +545,12 @@ namespace FlaxEditor.GUI.Timeline
                         _durationFrames = endMoveDuration;
                     }
                 }
+            }
+            else
+            {
+                // Global timeline selection moving end
+                _timeline.OnKeyframesMove(null, this, _mouseLocation, false, true);
+            }
 
             EndMouseCapture();
         }

Source/Editor/GUI/Timeline/Timeline.cs

@@ -219,6 +219,10 @@ namespace FlaxEditor.GUI.Timeline
         private bool _isRightMouseButtonDown;
         private Vector2 _rightMouseButtonDownPos;
         private Vector2 _rightMouseButtonMovePos;
+        private Vector2 _mediaMoveStartPos;
+        private int[] _mediaMoveStartFrames;
+        private List<Track> _mediaMoveStartTracks;
+        private byte[][] _mediaMoveStartData;
         private float _zoom = 1.0f;
         private bool _isMovingPositionHandle;
         private bool _canPlayPause = true, _canStop = true;
@@ -1375,7 +1379,7 @@ namespace FlaxEditor.GUI.Timeline
             if (!addToSelection)
             {
                 SelectedTracks.Clear();
-                SelectedMedia.Clear();
+                OnKeyframesDeselect(null);
             }
             SelectedMedia.Add(media);
             OnSelectionChanged();
@@ -1425,19 +1429,13 @@ namespace FlaxEditor.GUI.Timeline
         }
 
         /// <summary>
-        /// Deletes the selected tracks/media events.
+        /// Deletes the selected tracks.
         /// </summary>
         /// <param name="withUndo">True if use undo/redo action for track removing.</param>
-        public void DeleteSelection(bool withUndo = true)
+        public void DeleteSelectedTracks(bool withUndo = true)
         {
-            if (SelectedMedia.Count > 0)
+            if (SelectedTracks.Count == 0)
-            {
+                return;
-                throw new NotImplementedException("TODO: removing selected media events");
-            }
-
-            if (SelectedTracks.Count > 0)
-            {
-                // Delete selected tracks
             var tracks = new List<Track>(SelectedTracks.Count);
             for (int i = 0; i < SelectedTracks.Count; i++)
             {
@@ -1466,7 +1464,6 @@ namespace FlaxEditor.GUI.Timeline
             OnTracksChanged();
             MarkAsEdited();
         }
-        }
 
         /// <summary>
         /// Deletes the track.
@@ -1539,6 +1536,33 @@ namespace FlaxEditor.GUI.Timeline
             MarkAsEdited();
         }
 
+        /// <summary>
+        /// Adds the media.
+        /// </summary>
+        /// <param name="track">The track to add media to.</param>
+        /// <param name="media">The media to add.</param>
+        /// <param name="withUndo">True if use undo/redo action for media adding.</param>
+        public void AddMedia(Track track, Media media, bool withUndo = true)
+        {
+            if (track == null || media == null)
+                throw new ArgumentNullException();
+            if (media.Track != null)
+                throw new InvalidOperationException();
+            if (withUndo && Undo != null && Undo.Enabled)
+            {
+                var before = EditTrackAction.CaptureData(track);
+                track.AddMedia(media);
+                var after = EditTrackAction.CaptureData(track);
+                Undo.AddAction(new EditTrackAction(this, track, before, after));
+            }
+            else
+            {
+                track.AddMedia(media);
+            }
+            MarkAsEdited();
+            Select(media);
+        }
+
         /// <summary>
         /// Called to delete media.
         /// </summary>
@@ -1551,19 +1575,13 @@ namespace FlaxEditor.GUI.Timeline
         }
 
         /// <summary>
-        /// Duplicates the selected tracks/media events.
+        /// Duplicates the selected tracks.
         /// </summary>
         /// <param name="withUndo">True if use undo/redo action for track duplication.</param>
-        public void DuplicateSelection(bool withUndo = true)
+        public void DuplicateSelectedTracks(bool withUndo = true)
         {
-            if (SelectedMedia.Count > 0)
+            if (SelectedTracks.Count == 0)
-            {
+                return;
-                throw new NotImplementedException("TODO: duplicating selected media events");
-            }
-
-            if (SelectedTracks.Count > 0)
-            {
-                // Duplicate selected tracks
             var tracks = new List<Track>(SelectedTracks.Count);
             for (int i = 0; i < SelectedTracks.Count; i++)
             {
@@ -1634,7 +1652,6 @@ namespace FlaxEditor.GUI.Timeline
             MarkAsEdited();
             SelectedTracks[0].Focus();
         }
-        }
 
         /// <summary>
         /// Splits the media (all or selected only) at the given frame.
@@ -1885,6 +1902,9 @@ namespace FlaxEditor.GUI.Timeline
             if (!ContainsFocus)
                 Focus();
 
+            var timelinePos = MediaPanel.PointFromParent(this, location);
+            var time = (timelinePos.X - StartOffset) / (UnitsPerSecond * Zoom);
+
             var controlUnderMouse = GetChildAtRecursive(location);
             var mediaUnderMouse = controlUnderMouse;
             while (mediaUnderMouse != null && !(mediaUnderMouse is Media))
@@ -1895,19 +1915,31 @@ namespace FlaxEditor.GUI.Timeline
             var menu = new ContextMenu.ContextMenu();
             if (mediaUnderMouse is Media media)
             {
-                media.OnTimelineShowContextMenu(menu, controlUnderMouse);
+                media.OnTimelineContextMenu(menu, time, controlUnderMouse);
                 if (media.PropertiesEditObject != null)
                 {
-                    menu.AddButton("Edit media", () => ShowEditPopup(media.PropertiesEditObject, ref location, media.Track));
+                    menu.AddButton("Edit media", () => ShowEditPopup(media.PropertiesEditObject, location, media.Track));
+                }
+            }
+            else
+            {
+                OnKeyframesDeselect(null);
+                foreach (var track in _tracks)
+                {
+                    if (Mathf.IsInRange(timelinePos.Y, track.Top, track.Bottom))
+                    {
+                        track.OnTimelineContextMenu(menu, time);
+                        break;
+                    }
                 }
             }
             if (PropertiesEditObject != null)
             {
-                menu.AddButton("Edit timeline", () => ShowEditPopup(PropertiesEditObject, ref location, this));
+                menu.AddButton("Edit timeline", () => ShowEditPopup(PropertiesEditObject, location, this));
             }
             if (_tracks.Count > 1)
             {
-                menu.AddButton("Sort tracks", SortTracks).TooltipText = "Sorts sub tracks alphabetically";
+                menu.AddButton("Sort tracks", SortTracks).TooltipText = "Sorts tracks alphabetically";
             }
             menu.AddSeparator();
             menu.AddButton("Reset zoom", () => Zoom = 1.0f);
@@ -2067,6 +2099,9 @@ namespace FlaxEditor.GUI.Timeline
             case KeyboardKeys.S:
                 Split(CurrentFrame);
                 return true;
+            case KeyboardKeys.Delete:
+                OnKeyframesDelete(null);
+                return true;
             }
 
             return false;
@@ -2089,7 +2124,7 @@ namespace FlaxEditor.GUI.Timeline
         /// <param name="obj">The object.</param>
         /// <param name="location">The show location (in timeline space).</param>
         /// <param name="undoContext">The undo context object.</param>
-        protected virtual void ShowEditPopup(object obj, ref Vector2 location, object undoContext = null)
+        public virtual void ShowEditPopup(object obj, Vector2 location, object undoContext = null)
         {
             var popup = new PropertiesEditPopup(this, obj, undoContext);
             popup.Show(this, location);
@@ -2145,6 +2180,11 @@ namespace FlaxEditor.GUI.Timeline
                 if (_tracks[i] is IKeyframesEditorContext trackContext)
                     trackContext.OnKeyframesDeselect(editor);
             }
+            if (SelectedMedia.Count != 0)
+            {
+                SelectedMedia.Clear();
+                OnSelectionChanged();
+            }
         }
 
         /// <inheritdoc />
@@ -2152,17 +2192,38 @@ namespace FlaxEditor.GUI.Timeline
         {
             var globalControl = _backgroundArea;
             var globalRect = Rectangle.FromPoints(control.PointToParent(globalControl, selection.UpperLeft), control.PointToParent(globalControl, selection.BottomRight));
+            var mediaControl = MediaPanel;
+            var mediaRect = Rectangle.FromPoints(mediaControl.PointFromParent(globalRect.UpperLeft), mediaControl.PointFromParent(globalRect.BottomRight));
+            var selectionChanged = false;
+            if (SelectedMedia.Count != 0)
+            {
+                SelectedMedia.Clear();
+                selectionChanged = true;
+            }
             for (int i = 0; i < _tracks.Count; i++)
             {
                 if (_tracks[i] is IKeyframesEditorContext trackContext)
                     trackContext.OnKeyframesSelection(editor, globalControl, globalRect);
+
+                foreach (var media in _tracks[i].Media)
+                {
+                    if (media.Bounds.Intersects(ref mediaRect))
+                    {
+                        SelectedMedia.Add(media);
+                        selectionChanged = true;
+                    }
+                }
+            }
+            if (selectionChanged)
+            {
+                OnSelectionChanged();
             }
         }
 
         /// <inheritdoc />
         public int OnKeyframesSelectionCount()
         {
-            int result = 0;
+            int result = SelectedMedia.Count;
             for (int i = 0; i < _tracks.Count; i++)
             {
                 if (_tracks[i] is IKeyframesEditorContext trackContext)
@@ -2179,6 +2240,45 @@ namespace FlaxEditor.GUI.Timeline
                 if (_tracks[i] is IKeyframesEditorContext trackContext)
                     trackContext.OnKeyframesDelete(editor);
             }
+
+            // Delete selected media events
+            if (SelectedMedia.Count != 0)
+            {
+                if (Undo != null && Undo.Enabled)
+                {
+                    // Undo per-track
+                    if (_mediaMoveStartTracks == null)
+                        _mediaMoveStartTracks = new List<Track>();
+                    else
+                        _mediaMoveStartTracks.Clear();
+                    for (var i = 0; i < SelectedMedia.Count; i++)
+                    {
+                        var media = SelectedMedia[i];
+                        if (!_mediaMoveStartTracks.Contains(media.Track))
+                            _mediaMoveStartTracks.Add(media.Track);
+                    }
+                    _mediaMoveStartData = new byte[_mediaMoveStartTracks.Count][];
+                    for (int i = 0; i < _mediaMoveStartData.Length; i++)
+                        _mediaMoveStartData[i] = EditTrackAction.CaptureData(_mediaMoveStartTracks[i]);
+                }
+
+                foreach (var media in SelectedMedia.ToArray())
+                    OnDeleteMedia(media);
+
+                if (Undo != null && Undo.Enabled)
+                {
+                    for (int i = 0; i < _mediaMoveStartData.Length; i++)
+                    {
+                        var track = _mediaMoveStartTracks[i];
+                        var before = _mediaMoveStartData[i];
+                        var after = EditTrackAction.CaptureData(track);
+                        if (!Utils.ArraysEqual(before, after))
+                            AddBatchedUndoAction(new EditTrackAction(this, track, before, after));
+                    }
+                }
+
+                MarkAsEdited();
+            }
         }
 
         /// <inheritdoc />
@@ -2190,6 +2290,60 @@ namespace FlaxEditor.GUI.Timeline
                 if (_tracks[i] is IKeyframesEditorContext trackContext)
                     trackContext.OnKeyframesMove(editor, _backgroundArea, location, start, end);
             }
+            if (SelectedMedia.Count != 0)
+            {
+                location = MediaPanel.PointFromParent(location);
+                if (start)
+                {
+                    // Start moving selected media events
+                    _mediaMoveStartPos = location;
+                    _mediaMoveStartFrames = new int[SelectedMedia.Count];
+                    if (_mediaMoveStartTracks == null)
+                        _mediaMoveStartTracks = new List<Track>();
+                    else
+                        _mediaMoveStartTracks.Clear();
+                    for (var i = 0; i < SelectedMedia.Count; i++)
+                    {
+                        var media = SelectedMedia[i];
+                        _mediaMoveStartFrames[i] = media.StartFrame;
+                        if (!_mediaMoveStartTracks.Contains(media.Track))
+                            _mediaMoveStartTracks.Add(media.Track);
+                    }
+                    if (Undo != null && Undo.Enabled)
+                    {
+                        // Undo per-track
+                        _mediaMoveStartData = new byte[_mediaMoveStartTracks.Count][];
+                        for (int i = 0; i < _mediaMoveStartData.Length; i++)
+                            _mediaMoveStartData[i] = EditTrackAction.CaptureData(_mediaMoveStartTracks[i]);
+                    }
+                }
+                else if (end)
+                {
+                    // End moving selected media events
+                    if (_mediaMoveStartData != null)
+                    {
+                        for (int i = 0; i < _mediaMoveStartData.Length; i++)
+                        {
+                            var track = _mediaMoveStartTracks[i];
+                            var before = _mediaMoveStartData[i];
+                            var after = EditTrackAction.CaptureData(track);
+                            if (!Utils.ArraysEqual(before, after))
+                                AddBatchedUndoAction(new EditTrackAction(this, track, before, after));
+                        }
+                    }
+                    MarkAsEdited();
+                    _mediaMoveStartTracks.Clear();
+                    _mediaMoveStartFrames = null;
+                }
+                else
+                {
+                    // Move selected media events
+                    var moveLocationDelta = location - _mediaMoveStartPos;
+                    var moveDelta = (int)(moveLocationDelta.X / (UnitsPerSecond * Zoom) * FramesPerSecond);
+                    for (var i = 0; i < SelectedMedia.Count; i++)
+                        SelectedMedia[i].StartFrame = _mediaMoveStartFrames[i] + moveDelta;
+                }
+            }
         }
 
         /// <inheritdoc />

Source/Editor/GUI/Timeline/Track.cs

@@ -1028,6 +1028,15 @@ namespace FlaxEditor.GUI.Timeline
             return true;
         }
 
+        /// <summary>
+        /// Called when showing timeline context menu to the user. Can be used to add custom buttons.
+        /// </summary>
+        /// <param name="menu">The menu.</param>
+        /// <param name="time">The time (in seconds) at which context menu is shown (user clicked on a timeline).</param>
+        public virtual void OnTimelineContextMenu(ContextMenu.ContextMenu menu, float time)
+        {
+        }
+
         /// <summary>
         /// Called when context menu is being prepared to show. Can be used to add custom options.
         /// </summary>
@@ -1051,7 +1060,7 @@ namespace FlaxEditor.GUI.Timeline
                 if (CanRename)
                     menu.AddButton("Rename", "F2", StartRenaming);
                 if (CanCopyPaste)
-                    menu.AddButton("Duplicate", "Ctrl+D", () => Timeline.DuplicateSelection());
+                    menu.AddButton("Duplicate", "Ctrl+D", () => Timeline.DuplicateSelectedTracks());
                 menu.AddButton("Delete", "Del", Delete);
                 if (CanExpand)
                 {
@@ -1292,12 +1301,12 @@ namespace FlaxEditor.GUI.Timeline
                         StartRenaming();
                     return true;
                 case KeyboardKeys.Delete:
-                    _timeline.DeleteSelection();
+                    _timeline.DeleteSelectedTracks();
                     return true;
                 case KeyboardKeys.D:
                     if (Root.GetKey(KeyboardKeys.Control) && CanCopyPaste)
                     {
-                        _timeline.DuplicateSelection();
+                        _timeline.DuplicateSelectedTracks();
                         return true;
                     }
                     break;

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

@@ -0,0 +1,283 @@
+// Copyright (c) 2012-2021 Wojciech Figat. All rights reserved.
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using FlaxEditor.CustomEditors;
+using FlaxEditor.GUI.ContextMenu;
+using FlaxEditor.Scripting;
+using FlaxEditor.Utilities;
+using FlaxEngine;
+using FlaxEngine.GUI;
+using Object = FlaxEngine.Object;
+
+namespace FlaxEditor.GUI.Timeline.Tracks
+{
+    /// <summary>
+    /// The timeline media for <see cref="AnimEvent"/> and <see cref="AnimContinuousEvent"/>.
+    /// </summary>
+    public sealed class AnimationEventMedia : Media
+    {
+        private sealed class ProxyEditor : SyncPointEditor
+        {
+            /// <inheritdoc />
+            public override IEnumerable<object> UndoObjects => Values;
+
+            /// <inheritdoc />
+            public override void Initialize(LayoutElementsContainer layout)
+            {
+                base.Initialize(layout);
+
+                var instance = (AnimEvent)Values[0];
+                var scriptType = TypeUtils.GetObjectType(instance);
+                var editor = CustomEditorsUtil.CreateEditor(scriptType, false);
+                layout.Object(Values, editor);
+            }
+        }
+
+        private sealed class Proxy : ProxyBase<AnimationEventTrack, AnimationEventMedia>
+        {
+            [EditorDisplay("General", EditorDisplayAttribute.InlineStyle), CustomEditor(typeof(ProxyEditor))]
+            public AnimEvent Event
+            {
+                get => Media.Instance;
+                set => Media.Instance = value;
+            }
+
+            public Proxy(AnimationEventTrack track, AnimationEventMedia media)
+            : base(track, media)
+            {
+            }
+        }
+
+        private bool _isRegisteredForScriptsReload;
+        private string _instanceTypeName;
+        private byte[] _instanceData;
+
+        /// <summary>
+        /// The event type.
+        /// </summary>
+        public ScriptType Type;
+
+        /// <summary>
+        /// The event instance.
+        /// </summary>
+        public AnimEvent Instance;
+
+        /// <summary>
+        /// True if event is continuous (with duration), not a single frame.
+        /// </summary>
+        public bool IsContinuous;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="AnimationEventMedia"/> class.
+        /// </summary>
+        public AnimationEventMedia()
+        {
+            PropertiesEditObject = new Proxy(null, this);
+        }
+
+        private void OnScriptsReloadBegin()
+        {
+            if (Instance)
+            {
+                _instanceTypeName = Type.TypeName;
+                Type = ScriptType.Null;
+                _instanceData = FlaxEngine.Json.JsonSerializer.SaveToBytes(Instance);
+                Object.Destroy(ref Instance);
+                ScriptsBuilder.ScriptsReloadEnd += OnScriptsReloadEnd;
+            }
+        }
+
+        private void OnScriptsReloadEnd()
+        {
+            ScriptsBuilder.ScriptsReloadEnd -= OnScriptsReloadEnd;
+            Type = TypeUtils.GetType(_instanceTypeName);
+            if (Type == ScriptType.Null)
+            {
+                Editor.LogError("Missing anim event type " + _instanceTypeName);
+                return;
+            }
+            Instance = (AnimEvent)Type.CreateInstance();
+            FlaxEngine.Json.JsonSerializer.LoadFromBytes(Instance, _instanceData, Globals.EngineBuildNumber);
+            _instanceData = null;
+        }
+
+        /// <summary>
+        /// Initializes track for the specified type.
+        /// </summary>
+        /// <param name="type">The type.</param>
+        public void Init(ScriptType type)
+        {
+            Type = type;
+            IsContinuous = new ScriptType(typeof(AnimContinuousEvent)).IsAssignableFrom(type);
+            CanDelete = true;
+            CanSplit = IsContinuous;
+            CanResize = IsContinuous;
+            TooltipText = Surface.SurfaceUtils.GetVisualScriptTypeDescription(type);
+            Instance = (AnimEvent)type.CreateInstance();
+            BackgroundColor = Instance.Color;
+            if (!_isRegisteredForScriptsReload)
+            {
+                _isRegisteredForScriptsReload = true;
+                ScriptsBuilder.ScriptsReloadBegin += OnScriptsReloadBegin;
+            }
+        }
+
+        /// <inheritdoc />
+        protected override void OnDurationFramesChanged()
+        {
+            if (Type != ScriptType.Null)
+                DurationFrames = IsContinuous ? Mathf.Max(DurationFrames, 2) : 1;
+
+            base.OnDurationFramesChanged();
+        }
+
+        /// <inheritdoc />
+        public override void OnDestroy()
+        {
+            Type = ScriptType.Null;
+            Object.Destroy(ref Instance);
+            if (_isRegisteredForScriptsReload)
+            {
+                _isRegisteredForScriptsReload = false;
+                ScriptsBuilder.ScriptsReloadBegin -= OnScriptsReloadBegin;
+            }
+
+            base.OnDestroy();
+        }
+    }
+
+    /// <summary>
+    /// The timeline track for <see cref="AnimEvent"/> and <see cref="AnimContinuousEvent"/>.
+    /// </summary>
+    public sealed class AnimationEventTrack : Track
+    {
+        /// <summary>
+        /// Gets the archetype.
+        /// </summary>
+        /// <returns>The archetype.</returns>
+        public static TrackArchetype GetArchetype()
+        {
+            return new TrackArchetype
+            {
+                TypeId = 19,
+                Name = "Animation Event",
+                Create = options => new AnimationEventTrack(ref options),
+                Load = LoadTrack,
+                Save = SaveTrack,
+            };
+        }
+
+        private static void LoadTrack(int version, Track track, BinaryReader stream)
+        {
+            var e = (AnimationEventTrack)track;
+            var count = stream.ReadInt32();
+            while (e.Media.Count > count)
+                e.RemoveMedia(e.Media.Last());
+            while (e.Media.Count < count)
+                e.AddMedia(new AnimationEventMedia());
+            for (int i = 0; i < count; i++)
+            {
+                var m = (AnimationEventMedia)e.Media[i];
+                m.StartFrame = (int)stream.ReadSingle();
+                m.DurationFrames = (int)stream.ReadSingle();
+                var typeName = stream.ReadStrAnsi(13);
+                var type = TypeUtils.GetType(typeName);
+                if (type == ScriptType.Null)
+                    throw new Exception($"Unknown type {typeName}.");
+                m.Init(type);
+                stream.ReadJson(m.Instance);
+            }
+        }
+
+        private static void SaveTrack(Track track, BinaryWriter stream)
+        {
+            var e = (AnimationEventTrack)track;
+            var count = e.Media.Count;
+            stream.Write(count);
+            for (int i = 0; i < count; i++)
+            {
+                var m = (AnimationEventMedia)e.Media[i];
+                stream.Write((float)m.StartFrame);
+                stream.Write((float)m.DurationFrames);
+                stream.WriteStrAnsi(m.Type.TypeName, 13);
+                stream.WriteJson(m.Instance);
+            }
+        }
+
+        /// <inheritdoc />
+        public AnimationEventTrack(ref TrackCreateOptions options)
+        : base(ref options)
+        {
+            // Add button
+            const float buttonSize = 14;
+            var addButton = new Button
+            {
+                Text = "+",
+                TooltipText = "Add events",
+                AutoFocus = true,
+                AnchorPreset = AnchorPresets.MiddleRight,
+                IsScrollable = false,
+                Offsets = new Margin(-buttonSize - 2 + _muteCheckbox.Offsets.Left, buttonSize, buttonSize * -0.5f, buttonSize),
+                Parent = this,
+            };
+            addButton.ButtonClicked += OnAddButtonClicked;
+        }
+
+        private void OnAddButtonClicked(Button button)
+        {
+            var cm = new ContextMenu.ContextMenu();
+            OnContextMenu(cm);
+            cm.Show(button.Parent, button.BottomLeft);
+        }
+
+        /// <inheritdoc />
+        public override void OnTimelineContextMenu(ContextMenu.ContextMenu menu, float time)
+        {
+            base.OnTimelineContextMenu(menu, time);
+
+            AddContextMenu(menu, time);
+        }
+
+        /// <inheritdoc />
+        protected override void OnContextMenu(ContextMenu.ContextMenu menu)
+        {
+            base.OnContextMenu(menu);
+
+            menu.AddSeparator();
+            AddContextMenu(menu, 0.0f);
+        }
+
+        private void AddContextMenu(ContextMenu.ContextMenu menu, float time)
+        {
+            var addEvent = menu.AddChildMenu("Add Anim Event");
+            var addContinuousEvent = menu.AddChildMenu("Add Anim Continuous Event");
+            var animEventTypes = Editor.Instance.CodeEditing.All.Get().Where(x => new ScriptType(typeof(AnimEvent)).IsAssignableFrom(x));
+            foreach (var type in animEventTypes)
+            {
+                if (type.IsAbstract || !type.CanCreateInstance)
+                    continue;
+                var add = new ScriptType(typeof(AnimContinuousEvent)).IsAssignableFrom(type) ? addContinuousEvent : addEvent;
+                var b = add.ContextMenu.AddButton(type.Name);
+                b.TooltipText = Surface.SurfaceUtils.GetVisualScriptTypeDescription(type);
+                b.Tag = type;
+                b.Parent.Tag = time;
+                b.ButtonClicked += OnAddAnimEvent;
+            }
+        }
+
+
+        private void OnAddAnimEvent(ContextMenuButton button)
+        {
+            var type = (ScriptType)button.Tag;
+            var time = (float)button.Parent.Tag;
+            var media = new AnimationEventMedia();
+            media.Init(type);
+            media.StartFrame = (int)(time * Timeline.FramesPerSecond);
+            media.DurationFrames = media.IsContinuous ? Mathf.Max(Timeline.DurationFrames / 10, 10) : 1;
+            Timeline.AddMedia(this, media);
+        }
+    }
+}

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

@@ -324,12 +324,12 @@ namespace FlaxEditor.GUI.Timeline.Tracks
         }
 
         /// <inheritdoc />
-        public override void OnTimelineShowContextMenu(ContextMenu.ContextMenu menu, Control controlUnderMouse)
+        public override void OnTimelineContextMenu(ContextMenu.ContextMenu menu, float time, Control controlUnderMouse)
         {
             if (((CameraCutTrack)Track).Camera)
                 menu.AddButton("Refresh thumbnails", () => UpdateThumbnails());
 
-            base.OnTimelineShowContextMenu(menu, controlUnderMouse);
+            base.OnTimelineContextMenu(menu, time, controlUnderMouse);
         }
 
         /// <inheritdoc />

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

@@ -101,9 +101,9 @@ namespace FlaxEditor.GUI.Timeline.Tracks
         }
 
         /// <inheritdoc />
-        public override void OnTimelineShowContextMenu(ContextMenu.ContextMenu menu, Control controlUnderMouse)
+        public override void OnTimelineContextMenu(ContextMenu.ContextMenu menu, float time, Control controlUnderMouse)
         {
-            base.OnTimelineShowContextMenu(menu, controlUnderMouse);
+            base.OnTimelineContextMenu(menu, time, controlUnderMouse);
 
             if (controlUnderMouse is GradientEditor.StopControl stop)
             {

Source/Editor/Managed/ManagedEditor.cpp

@@ -140,7 +140,7 @@ void OnVisualScriptingDebugFlow()
 void OnLogMessage(LogType type, const StringView& msg);
 
 ManagedEditor::ManagedEditor()
-    : PersistentScriptingObject(SpawnParams(ObjectID, ManagedEditor::TypeInitializer))
+    : ScriptingObject(SpawnParams(ObjectID, ManagedEditor::TypeInitializer))
 {
     // Link events
     auto editor = ((NativeBinaryModule*)GetBinaryModuleFlaxEngine())->Assembly;
@@ -476,11 +476,6 @@ void ManagedEditor::OnEditorAssemblyLoaded(MAssembly* assembly)
     CreateManaged();
 }
 
-String ManagedEditor::ToString() const
-{
-    return TEXT("ManagedEditor");
-}
-
 void ManagedEditor::DestroyManaged()
 {
     // Ensure to cleanup managed stuff
@@ -499,5 +494,5 @@ void ManagedEditor::DestroyManaged()
     Internal_OnVisualScriptingDebugFlow = nullptr;
 
     // Base
-    PersistentScriptingObject::DestroyManaged();
+    ScriptingObject::DestroyManaged();
 }

Source/Editor/Managed/ManagedEditor.h

@@ -14,7 +14,7 @@ namespace CSG
 /// <summary>
 /// Managed Editor root object
 /// </summary>
-class ManagedEditor : public PersistentScriptingObject
+class ManagedEditor : public ScriptingObject
 {
 DECLARE_SCRIPTING_TYPE_NO_SPAWN(ManagedEditor);
 
@@ -144,7 +144,6 @@ private:
 
 public:
 
-    // [PersistentScriptingObject]
+    // [ScriptingObject]
-    String ToString() const override;
     void DestroyManaged() override;
 };

Source/Editor/Scripting/ScriptsBuilder.h

@@ -4,7 +4,6 @@
 
 #include "Engine/Core/Delegate.h"
 #include "Engine/Core/Types/String.h"
-#include "Engine/Core/Collections/Array.h"
 #include "Engine/Scripting/ScriptingType.h"
 
 /// <summary>

Source/Editor/Viewport/Previews/AnimatedModelPreview.cs

@@ -163,6 +163,7 @@ namespace FlaxEditor.Viewport.Previews
         : base(useWidgets)
         {
             Task.Begin += OnBegin;
+            ScriptsBuilder.ScriptsReloadBegin += OnScriptsReloadBegin;
 
             // Setup preview scene
             _previewModel = new AnimatedModel
@@ -275,6 +276,12 @@ namespace FlaxEditor.Viewport.Previews
             }
         }
 
+        private void OnScriptsReloadBegin()
+        {
+            // Prevent any crashes due to dangling references to anim events
+            _previewModel.ResetAnimation();
+        }
+
         private int ComputeLODIndex(SkinnedModel model)
         {
             if (PreviewActor.ForcedLOD != -1)
@@ -428,6 +435,7 @@ namespace FlaxEditor.Viewport.Previews
         /// <inheritdoc />
         public override void OnDestroy()
         {
+            ScriptsBuilder.ScriptsReloadBegin -= OnScriptsReloadBegin;
             Object.Destroy(ref _floorModel);
             Object.Destroy(ref _previewModel);
             NodesMask = null;

Source/Editor/Viewport/Previews/AnimationPreview.cs

@@ -44,7 +44,7 @@ namespace FlaxEditor.Viewport.Previews
             // Playback Speed
             {
                 var playbackSpeed = ViewWidgetButtonMenu.AddButton("Playback Speed");
-                var playbackSpeedValue = new FloatValueBox(-1, 90, 2, 70.0f, 0.0f, 10000.0f, 0.001f)
+                var playbackSpeedValue = new FloatValueBox(-1, 90, 2, 70.0f, -10000.0f, 10000.0f, 0.001f)
                 {
                     Parent = playbackSpeed
                 };

Source/Editor/Windows/Assets/AnimationWindow.cs

@@ -254,6 +254,7 @@ namespace FlaxEditor.Windows.Assets
                 Enabled = false
             };
             _timeline.Modified += MarkAsEdited;
+            _timeline.SetNoTracksText("Loading...");
 
             // Asset properties
             _propertiesPresenter = new CustomEditorPresenter(null);
@@ -361,6 +362,7 @@ namespace FlaxEditor.Windows.Assets
                 _timeline.Load(_asset);
                 _undo.Clear();
                 _timeline.Enabled = true;
+                _timeline.SetNoTracksText(null);
                 ClearEditedFlag();
             }
         }

Source/Editor/Windows/Assets/ParticleSystemWindow.cs

@@ -347,6 +347,7 @@ namespace FlaxEditor.Windows.Assets
             };
             _timeline.Modified += OnTimelineModified;
             _timeline.SelectionChanged += OnTimelineSelectionChanged;
+            _timeline.SetNoTracksText("Loading...");
 
             // Properties editor
             var propertiesEditor = new CustomEditorPresenter(_undo, string.Empty);
@@ -527,6 +528,7 @@ namespace FlaxEditor.Windows.Assets
                 // Setup
                 _undo.Clear();
                 _timeline.Enabled = true;
+                _timeline.SetNoTracksText(null);
                 _propertiesEditor.Select(new GeneralProxy(this));
                 ClearEditedFlag();
             }

Source/Engine/Animations/AnimEvent.cpp

@@ -0,0 +1,70 @@
+// Copyright (c) 2012-2021 Wojciech Figat. All rights reserved.
+
+#include "AnimEvent.h"
+#include "Engine/Scripting/BinaryModule.h"
+#include "Engine/Scripting/ManagedSerialization.h"
+#include "Engine/Serialization/SerializationFwd.h"
+#include "Engine/Serialization/Serialization.h"
+
+AnimEvent::AnimEvent(const SpawnParams& params)
+    : ScriptingObject(params)
+{
+}
+
+void AnimEvent::Serialize(SerializeStream& stream, const void* otherObj)
+{
+    SERIALIZE_GET_OTHER_OBJ(AnimEvent);
+
+#if !COMPILE_WITHOUT_CSHARP
+    // Handle C# objects data serialization
+    if (Flags & ObjectFlags::IsManagedType)
+    {
+        stream.JKEY("V");
+        if (other)
+        {
+            ManagedSerialization::SerializeDiff(stream, GetOrCreateManagedInstance(), other->GetOrCreateManagedInstance());
+        }
+        else
+        {
+            ManagedSerialization::Serialize(stream, GetOrCreateManagedInstance());
+        }
+    }
+#endif
+
+    // Handle custom scripting objects data serialization
+    if (Flags & ObjectFlags::IsCustomScriptingType)
+    {
+        stream.JKEY("D");
+        _type.Module->SerializeObject(stream, this, other);
+    }
+}
+
+void AnimEvent::Deserialize(DeserializeStream& stream, ISerializeModifier* modifier)
+{
+#if !COMPILE_WITHOUT_CSHARP
+    // Handle C# objects data serialization
+    if (Flags & ObjectFlags::IsManagedType)
+    {
+        auto* const v = SERIALIZE_FIND_MEMBER(stream, "V");
+        if (v != stream.MemberEnd() && v->value.IsObject() && v->value.MemberCount() != 0)
+        {
+            ManagedSerialization::Deserialize(v->value, GetOrCreateManagedInstance());
+        }
+    }
+#endif
+
+    // Handle custom scripting objects data serialization
+    if (Flags & ObjectFlags::IsCustomScriptingType)
+    {
+        auto* const v = SERIALIZE_FIND_MEMBER(stream, "D");
+        if (v != stream.MemberEnd() && v->value.IsObject() && v->value.MemberCount() != 0)
+        {
+            _type.Module->DeserializeObject(v->value, this, modifier);
+        }
+    }
+}
+
+AnimContinuousEvent::AnimContinuousEvent(const SpawnParams& params)
+    : AnimEvent(params)
+{
+}

Source/Engine/Animations/AnimEvent.h

@@ -0,0 +1,72 @@
+// Copyright (c) 2012-2021 Wojciech Figat. All rights reserved.
+
+#pragma once
+
+#include "Engine/Scripting/ScriptingObject.h"
+#include "Engine/Core/ISerializable.h"
+#if USE_EDITOR
+#include "Engine/Core/Math/Color.h"
+#endif
+
+class AnimatedModel;
+class Animation;
+
+/// <summary>
+/// The animation notification event triggered during animation playback.
+/// </summary>
+API_CLASS(Abstract) class FLAXENGINE_API AnimEvent : public ScriptingObject, public ISerializable
+{
+    DECLARE_SCRIPTING_TYPE(AnimEvent);
+
+#if USE_EDITOR
+    /// <summary>
+    /// Event display color in the Editor.
+    /// </summary>
+    API_FIELD(Attributes="HideInEditor, NoSerialize") Color Color = Color::White;
+#endif
+
+    /// <summary>
+    /// Animation event notification.
+    /// </summary>
+    /// <param name="actor">The animated model actor instance.</param>
+    /// <param name="anim">The source animation.</param>
+    /// <param name="time">The current animation time (in seconds).</param>
+    /// <param name="deltaTime">The current animation tick delta time (in seconds).</param>
+    API_FUNCTION() virtual void OnEvent(AnimatedModel* actor, Animation* anim, float time, float deltaTime)
+    {
+    }
+
+    // [ISerializable]
+    void Serialize(SerializeStream& stream, const void* otherObj) override;
+    void Deserialize(DeserializeStream& stream, ISerializeModifier* modifier) override;
+};
+
+/// <summary>
+/// The animation notification event (with duration) triggered during animation playback that contains begin and end (event notification is received as a tick).
+/// </summary>
+API_CLASS(Abstract) class FLAXENGINE_API AnimContinuousEvent : public AnimEvent
+{
+    DECLARE_SCRIPTING_TYPE(AnimContinuousEvent);
+
+    /// <summary>
+    /// Animation notification called before the first event.
+    /// </summary>
+    /// <param name="actor">The animated model actor instance.</param>
+    /// <param name="anim">The source animation.</param>
+    /// <param name="time">The current animation time (in seconds).</param>
+    /// <param name="deltaTime">The current animation tick delta time (in seconds).</param>
+    API_FUNCTION() virtual void OnBegin(AnimatedModel* actor, Animation* anim, float time, float deltaTime)
+    {
+    }
+
+    /// <summary>
+    /// Animation notification called after the last event (guaranteed to be always called).
+    /// </summary>
+    /// <param name="actor">The animated model actor instance.</param>
+    /// <param name="anim">The source animation.</param>
+    /// <param name="time">The current animation time (in seconds).</param>
+    /// <param name="deltaTime">The current animation tick delta time (in seconds).</param>
+    API_FUNCTION() virtual void OnEnd(AnimatedModel* actor, Animation* anim, float time, float deltaTime)
+    {
+    }
+};

Source/Engine/Animations/AnimationUtils.h

@@ -14,7 +14,13 @@ namespace AnimationUtils
     template<class T>
     FORCE_INLINE static T GetZero()
     {
-        return 0.0f;
+        return T();
+    }
+
+    template<>
+    FORCE_INLINE int32 GetZero<int32>()
+    {
+        return 0;
     }
 
     template<>

Source/Engine/Animations/Curve.h

@@ -769,6 +769,12 @@ public:
     }
 };
 
+/// <summary>
+/// An animation spline represented by a set of keyframes, each representing a value point. 
+/// </summary>
+template<typename T>
+using StepCurve = Curve<T, StepCurveKeyframe<T>>;
+
 /// <summary>
 /// An animation spline represented by a set of keyframes, each representing an endpoint of a linear curve. 
 /// </summary>

Source/Engine/Animations/CurveSerialization.h

@@ -186,6 +186,7 @@ namespace Serialization
 
         // Raw keyframes data
         stream.WriteInt32(keyframes.Count());
+        static_assert(TIsPODType<T>::Value, "Raw bytes serialization only for raw POD types.");
         stream.WriteBytes(keyframes.Get(), keyframes.Count() * sizeof(KeyFrame));
     }
 
@@ -209,6 +210,7 @@ namespace Serialization
         int32 keyframesCount;
         stream.ReadInt32(&keyframesCount);
         keyframes.Resize(keyframesCount, false);
+        static_assert(TIsPODType<T>::Value, "Raw bytes serialization only for raw POD types.");
         stream.ReadBytes(keyframes.Get(), keyframes.Count() * sizeof(KeyFrame));
 
         return false;

Source/Engine/Animations/Graph/AnimGraph.cpp

@@ -2,6 +2,7 @@
 
 #include "AnimGraph.h"
 #include "Engine/Animations/Animations.h"
+#include "Engine/Animations/AnimEvent.h"
 #include "Engine/Content/Assets/SkinnedModel.h"
 #include "Engine/Graphics/Models/SkeletonData.h"
 #include "Engine/Scripting/Scripting.h"
@@ -91,6 +92,9 @@ void AnimGraphInstanceData::Clear()
     State.Resize(0);
     NodesPose.Resize(0);
     Slots.Resize(0);
+    for (const auto& e : Events)
+        ((AnimContinuousEvent*)e.Instance)->OnEnd((AnimatedModel*)Object, e.Anim, 0.0f, 0.0f);
+    Events.Resize(0);
 }
 
 void AnimGraphInstanceData::ClearState()
@@ -103,6 +107,9 @@ void AnimGraphInstanceData::ClearState()
     State.Resize(0);
     NodesPose.Resize(0);
     Slots.Clear();
+    for (const auto& e : Events)
+        ((AnimContinuousEvent*)e.Instance)->OnEnd((AnimatedModel*)Object, e.Anim, 0.0f, 0.0f);
+    Events.Clear();
 }
 
 void AnimGraphInstanceData::Invalidate()
@@ -246,6 +253,8 @@ void AnimGraphExecutor::Update(AnimGraphInstanceData& data, float dt)
             // Initialize buckets
             ResetBuckets(context, &_graph);
         }
+        for (auto& e : data.Events)
+            e.Hit = false;
 
         // Init empty nodes data
         context.EmptyNodes.RootMotion = RootMotionData::Identity;
@@ -279,6 +288,19 @@ void AnimGraphExecutor::Update(AnimGraphInstanceData& data, float dt)
         if (animResult == nullptr)
             animResult = GetEmptyNodes();
     }
+    if (data.Events.Count() != 0)
+    {
+        ANIM_GRAPH_PROFILE_EVENT("Events");
+        for (int32 i = data.Events.Count() - 1; i >= 0; i--)
+        {
+            const auto& e = data.Events[i];
+            if (!e.Hit)
+            {
+                ((AnimContinuousEvent*)e.Instance)->OnEnd((AnimatedModel*)context.Data->Object, e.Anim, 0.0f, 0.0f);
+                data.Events.RemoveAt(i);
+            }
+        }
+    }
 
     // Allow for external override of the local pose (eg. by the ragdoll)
     data.LocalPoseOverride(animResult);

Source/Engine/Animations/Graph/AnimGraph.h

@@ -16,6 +16,7 @@
 #define ANIM_GRAPH_MULTI_BLEND_2D_MAX_TRIS 32
 #define ANIM_GRAPH_MAX_STATE_TRANSITIONS 64
 #define ANIM_GRAPH_MAX_CALL_STACK 100
+#define ANIM_GRAPH_MAX_EVENTS 64
 
 class AnimGraph;
 class AnimSubGraph;
@@ -267,6 +268,7 @@ struct FLAXENGINE_API AnimGraphSlot
 /// </summary>
 class FLAXENGINE_API AnimGraphInstanceData
 {
+    friend AnimGraphExecutor;
 public:
 
     // ---- Quick documentation ----
@@ -384,7 +386,7 @@ public:
     /// <summary>
     /// The slots animations.
     /// </summary>
-    Array<AnimGraphSlot> Slots;
+    Array<AnimGraphSlot, InlinedAllocation<4>> Slots;
 
 public:
 
@@ -402,6 +404,18 @@ public:
     /// Invalidates the update timer.
     /// </summary>
     void Invalidate();
+
+private:
+
+    struct Event
+    {
+        AnimEvent* Instance;
+        Animation* Anim;
+        AnimGraphNode* Node;
+        bool Hit;
+    };
+
+    Array<Event, InlinedAllocation<8>> Events;
 };
 
 /// <summary>

Source/Engine/Animations/Graph/AnimGroup.Animation.cpp

@@ -5,7 +5,9 @@
 #include "Engine/Content/Assets/SkeletonMask.h"
 #include "Engine/Content/Assets/AnimationGraphFunction.h"
 #include "Engine/Animations/AlphaBlend.h"
+#include "Engine/Animations/AnimEvent.h"
 #include "Engine/Animations/InverseKinematics.h"
+#include "Engine/Level/Actors/AnimatedModel.h"
 
 namespace
 {
@@ -146,6 +148,7 @@ Variant AnimGraphExecutor::SampleAnimation(AnimGraphNode* node, bool loop, float
     if (anim == nullptr || !anim->IsLoaded())
         return Value::Null;
     PROFILE_CPU_ASSET(anim);
+    const float oldTimePos = prevTimePos;
 
     // Calculate actual time position within the animation node (defined by length and loop mode)
     const float pos = GetAnimPos(newTimePos, startTimePos, loop, length);
@@ -180,6 +183,81 @@ Variant AnimGraphExecutor::SampleAnimation(AnimGraphNode* node, bool loop, float
         ExtractRootMotion(mapping, rootNodeIndex, anim, animPos, animPrevPos, nodes->Nodes[rootNodeIndex], nodes->RootMotion);
     }
 
+    // Collect events
+    if (anim->Events.Count() != 0)
+    {
+        ANIM_GRAPH_PROFILE_EVENT("Events");
+        auto& context = Context.Get();
+        float eventTimeMin = animPrevPos;
+        float eventTimeMax = animPos;
+        if (loop)
+        {
+            // Check if animation looped
+            const float posNotLooped = startTimePos + oldTimePos;
+            if (posNotLooped < 0.0f || posNotLooped > length)
+            {
+                if (context.DeltaTime * speed < 0)
+                {
+                    // Playback backwards
+                    Swap(eventTimeMin, eventTimeMax);
+                }
+            }
+        }
+        const float eventTime = animPos / static_cast<float>(anim->Data.FramesPerSecond);
+        const float eventDeltaTime = (animPos - animPrevPos) / static_cast<float>(anim->Data.FramesPerSecond);
+        for (const auto& track : anim->Events)
+        {
+            for (const auto& k : track.Second.GetKeyframes())
+            {
+                if (!k.Value.Instance)
+                    continue;
+                const float duration = k.Value.Duration > 1 ? k.Value.Duration : 0.0f;
+                if (k.Time <= eventTimeMax && eventTimeMin <= k.Time + duration)
+                {
+                    int32 stateIndex = -1;
+                    if (duration > 1)
+                    {
+                        // Begin for continuous event
+                        for (stateIndex = 0; stateIndex < context.Data->Events.Count(); stateIndex++)
+                        {
+                            const auto& e = context.Data->Events[stateIndex];
+                            if (e.Instance == k.Value.Instance && e.Node == node)
+                                break;
+                        }
+                        if (stateIndex == context.Data->Events.Count())
+                        {
+                            auto& e = context.Data->Events.AddOne();
+                            e.Instance = k.Value.Instance;
+                            e.Anim = anim;
+                            e.Node = node;
+                            ASSERT(k.Value.Instance->Is<AnimContinuousEvent>());
+                            ((AnimContinuousEvent*)k.Value.Instance)->OnBegin((AnimatedModel*)context.Data->Object, anim, eventTime, eventDeltaTime);
+                        }
+                    }
+
+                    // Event
+                    k.Value.Instance->OnEvent((AnimatedModel*)context.Data->Object, anim, eventTime, eventDeltaTime);
+                    if (stateIndex != -1)
+                        context.Data->Events[stateIndex].Hit = true;
+                }
+                else if (duration > 1)
+                {
+                    // End for continuous event
+                    for (int32 i = 0; i < context.Data->Events.Count(); i++)
+                    {
+                        const auto& e = context.Data->Events[i];
+                        if (e.Instance == k.Value.Instance && e.Node == node)
+                        {
+                            ((AnimContinuousEvent*)k.Value.Instance)->OnEnd((AnimatedModel*)context.Data->Object, anim, eventTime, eventDeltaTime);
+                            context.Data->Events.RemoveAt(i);
+                            break;
+                        }
+                    }
+                }
+            }
+        }
+    }
+
     return nodes;
 }
 

Source/Engine/Animations/SceneAnimations/SceneAnimation.h

@@ -42,6 +42,7 @@ public:
             CameraCut = 16,
             //AnimationChannel = 17,
             //AnimationChannelData = 18,
+            //AnimationEvent = 19,
         };
 
         enum class Flags

Source/Engine/Audio/AudioDevice.h

@@ -7,17 +7,17 @@
 /// <summary>
 /// Represents a single audio device.
 /// </summary>
-API_CLASS(NoSpawn) class AudioDevice : public PersistentScriptingObject
+API_CLASS(NoSpawn) class AudioDevice : public ScriptingObject
 {
 DECLARE_SCRIPTING_TYPE_NO_SPAWN(AudioDevice);
 
     explicit AudioDevice()
-        : PersistentScriptingObject(SpawnParams(Guid::New(), TypeInitializer))
+        : ScriptingObject(SpawnParams(Guid::New(), TypeInitializer))
     {
     }
 
     AudioDevice(const AudioDevice& other)
-        : PersistentScriptingObject(SpawnParams(Guid::New(), TypeInitializer))
+        : ScriptingObject(SpawnParams(Guid::New(), TypeInitializer))
     {
         Name = other.Name;
         InternalName = other.InternalName;

Source/Engine/Content/Assets/Animation.cpp

@@ -6,10 +6,13 @@
 #include "Engine/Profiler/ProfilerCPU.h"
 #include "Engine/Content/Factories/BinaryAssetFactory.h"
 #include "Engine/Animations/CurveSerialization.h"
+#include "Engine/Animations/AnimEvent.h"
+#include "Engine/Scripting/Scripting.h"
 #include "Engine/Threading/Threading.h"
 #include "Engine/Serialization/MemoryReadStream.h"
 #if USE_EDITOR
 #include "Engine/Serialization/MemoryWriteStream.h"
+#include "Engine/Level/Level.h"
 #endif
 
 REGISTER_BINARY_ASSET(Animation, "FlaxEngine.Animation", false);
@@ -19,6 +22,21 @@ Animation::Animation(const SpawnParams& params, const AssetInfo* info)
 {
 }
 
+#if USE_EDITOR
+
+void Animation::OnScriptsReloadStart()
+{
+    for (auto& e : Events)
+    {
+        for (auto& k : e.Second.GetKeyframes())
+        {
+            Level::ScriptsReloadRegisterObject((ScriptingObject*&)k.Value.Instance);
+        }
+    }
+}
+
+#endif
+
 Animation::InfoData Animation::GetInfo() const
 {
     ScopeLock lock(Locker);
@@ -127,7 +145,7 @@ void Animation::LoadTimeline(BytesContainer& result) const
     const float fpsInv = 1.0f / fps;
     stream.WriteFloat(fps);
     stream.WriteInt32((int32)Data.Duration);
-    int32 tracksCount = Data.Channels.Count();
+    int32 tracksCount = Data.Channels.Count() + Events.Count();
     for (auto& channel : Data.Channels)
         tracksCount +=
                 (channel.Position.GetKeyframes().HasItems() ? 1 : 0) +
@@ -214,6 +232,24 @@ void Animation::LoadTimeline(BytesContainer& result) const
             trackIndex++;
         }
     }
+    for (auto& e : Events)
+    {
+        // Animation Event track
+        stream.WriteByte(19); // Track Type
+        stream.WriteByte(0); // Track Flags
+        stream.WriteInt32(-1); // Parent Index
+        stream.WriteInt32(0); // Children Count
+        stream.WriteString(e.First, -13); // Name
+        stream.Write(&Color32::White); // Color
+        stream.WriteInt32(e.Second.GetKeyframes().Count()); // Events Count
+        for (const auto& k : e.Second.GetKeyframes())
+        {
+            stream.WriteFloat(k.Time);
+            stream.WriteFloat(k.Value.Duration);
+            stream.WriteStringAnsi(k.Value.TypeName, 13);
+            stream.WriteJson(k.Value.Instance);
+        }
+    }
 
     result.Copy(stream.GetHandle(), stream.GetPosition());
 }
@@ -253,6 +289,7 @@ bool Animation::SaveTimeline(BytesContainer& data)
 
         // Tracks
         Data.Channels.Clear();
+        Events.Clear();
         Dictionary<int32, int32> animationChannelTrackIndexToChannelIndex;
         animationChannelTrackIndexToChannelIndex.EnsureCapacity(tracksCount * 3);
         for (int32 trackIndex = 0; trackIndex < tracksCount; trackIndex++)
@@ -325,6 +362,36 @@ bool Animation::SaveTimeline(BytesContainer& data)
                 }
                 break;
             }
+            case 19:
+            {
+                // Animation Event
+                int32 count;
+                stream.ReadInt32(&count);
+                auto& eventTrack = Events.AddOne();
+                eventTrack.First = name;
+                eventTrack.Second.Resize(count);
+                for (int32 i = 0; i < count; i++)
+                {
+                    auto& k = eventTrack.Second.GetKeyframes()[i];
+                    stream.ReadFloat(&k.Time);
+                    stream.ReadFloat(&k.Value.Duration);
+                    stream.ReadStringAnsi(&k.Value.TypeName, 13);
+                    const ScriptingTypeHandle typeHandle = Scripting::FindScriptingType(k.Value.TypeName);
+                    k.Value.Instance = NewObject<AnimEvent>(typeHandle);
+                    stream.ReadJson(k.Value.Instance);
+                    if (!k.Value.Instance)
+                    {
+                        LOG(Error, "Failed to spawn object of type {0}.", String(k.Value.TypeName));
+                        continue;
+                    }
+                    if (!_registeredForScriptingReload)
+                    {
+                        _registeredForScriptingReload = true;
+                        Level::ScriptsReloadStart.Bind<Animation, &Animation::OnScriptsReloadStart>(this);
+                    }
+                }
+                break;
+            }
             default:
                 LOG(Error, "Unsupported track type {0} for animation.", trackType);
                 return true;
@@ -364,7 +431,7 @@ bool Animation::Save(const StringView& path)
         MemoryWriteStream stream(4096);
 
         // Info
-        stream.WriteInt32(100);
+        stream.WriteInt32(101);
         stream.WriteDouble(Data.Duration);
         stream.WriteDouble(Data.FramesPerSecond);
         stream.WriteBool(Data.EnableRootMotion);
@@ -381,6 +448,22 @@ bool Animation::Save(const StringView& path)
             Serialization::Serialize(stream, anim.Scale);
         }
 
+        // Animation events
+        stream.WriteInt32(Events.Count());
+        for (int32 i = 0; i < Events.Count(); i++)
+        {
+            auto& e = Events[i];
+            stream.WriteString(e.First, 172);
+            stream.WriteInt32(e.Second.GetKeyframes().Count());
+            for (const auto& k : e.Second.GetKeyframes())
+            {
+                stream.WriteFloat(k.Time);
+                stream.WriteFloat(k.Value.Duration);
+                stream.WriteStringAnsi(k.Value.TypeName, 17);
+                stream.WriteJson(k.Value.Instance);
+            }
+        }
+
         // Set data to the chunk asset
         auto chunk0 = GetOrCreateChunk(0);
         ASSERT(chunk0 != nullptr);
@@ -419,6 +502,24 @@ void Animation::OnSkinnedModelUnloaded(Asset* obj)
     MappingCache.Remove(i);
 }
 
+void Animation::OnScriptingDispose()
+{
+    // Dispose any events to prevent crashes (scripting is released before content)
+    for (auto& e : Events)
+    {
+        for (auto& k : e.Second.GetKeyframes())
+        {
+            if (k.Value.Instance)
+            {
+                Delete(k.Value.Instance);
+                k.Value.Instance = nullptr;
+            }
+        }
+    }
+
+    BinaryAsset::OnScriptingDispose();
+}
+
 Asset::LoadResult Animation::load()
 {
     // Get stream with animations data
@@ -432,6 +533,7 @@ Asset::LoadResult Animation::load()
     switch (headerVersion)
     {
     case 100:
+    case 101:
     {
         stream.ReadInt32(&headerVersion);
         stream.ReadDouble(&Data.Duration);
@@ -471,13 +573,72 @@ Asset::LoadResult Animation::load()
         }
     }
 
+    // Animation events
+    if (headerVersion >= 101)
+    {
+        int32 eventTracksCount;
+        stream.ReadInt32(&eventTracksCount);
+        Events.Resize(eventTracksCount, false);
+#if !USE_EDITOR
+        StringAnsi typeName;
+#endif
+        for (int32 i = 0; i < eventTracksCount; i++)
+        {
+            auto& e = Events[i];
+            stream.ReadString(&e.First, 172);
+            int32 eventsCount;
+            stream.ReadInt32(&eventsCount);
+            e.Second.GetKeyframes().Resize(eventsCount);
+            for (auto& k : e.Second.GetKeyframes())
+            {
+                stream.ReadFloat(&k.Time);
+                stream.ReadFloat(&k.Value.Duration);
+#if USE_EDITOR
+                StringAnsi& typeName = k.Value.TypeName;
+#endif
+                stream.ReadStringAnsi(&typeName, 17);
+                const ScriptingTypeHandle typeHandle = Scripting::FindScriptingType(typeName);
+                k.Value.Instance = NewObject<AnimEvent>(typeHandle);
+                stream.ReadJson(k.Value.Instance);
+                if (!k.Value.Instance)
+                {
+                    LOG(Error, "Failed to spawn object of type {0}.", String(typeName));
+                    continue;
+                }
+#if USE_EDITOR
+                if (!_registeredForScriptingReload)
+                {
+                    _registeredForScriptingReload = true;
+                    Level::ScriptsReloadStart.Bind<Animation, &Animation::OnScriptsReloadStart>(this);
+                }
+#endif
+            }
+        }
+    }
+
     return LoadResult::Ok;
 }
 
 void Animation::unload(bool isReloading)
 {
+#if USE_EDITOR
+    if (_registeredForScriptingReload)
+    {
+        _registeredForScriptingReload = false;
+        Level::ScriptsReloadStart.Unbind<Animation, &Animation::OnScriptsReloadStart>(this);
+    }
+#endif
     ClearCache();
     Data.Dispose();
+    for (const auto& e : Events)
+    {
+        for (const auto& k : e.Second.GetKeyframes())
+        {
+            if (k.Value.Instance)
+                Delete(k.Value.Instance);
+        }
+    }
+    Events.Clear();
 }
 
 AssetChunksFlag Animation::getChunksToPreload() const

Source/Engine/Content/Assets/Animation.h

@@ -7,6 +7,7 @@
 #include "Engine/Animations/AnimationData.h"
 
 class SkinnedModel;
+class AnimEvent;
 
 /// <summary>
 /// Asset that contains an animation spline represented by a set of keyframes, each representing an endpoint of a linear curve.
@@ -18,7 +19,7 @@ DECLARE_BINARY_ASSET_HEADER(Animation, 1);
     /// <summary>
     /// Contains basic information about the animation asset contents.
     /// </summary>
-    API_STRUCT() struct InfoData
+    API_STRUCT() struct FLAXENGINE_API InfoData
     {
     DECLARE_SCRIPTING_TYPE_NO_SPAWN(InfoData);
 
@@ -48,6 +49,25 @@ DECLARE_BINARY_ASSET_HEADER(Animation, 1);
         API_FIELD() int32 MemoryUsage;
     };
 
+    /// <summary>
+    /// Contains <see cref="AnimEvent"/> instance.
+    /// </summary>
+    struct FLAXENGINE_API AnimEventData
+    {
+        float Duration = 0.0f;
+        AnimEvent* Instance = nullptr;
+#if USE_EDITOR
+        StringAnsi TypeName;
+#endif
+    };
+
+private:
+    
+#if USE_EDITOR
+    bool _registeredForScriptingReload = false;
+    void OnScriptsReloadStart();
+#endif
+
 public:
 
     /// <summary>
@@ -55,6 +75,11 @@ public:
     /// </summary>
     AnimationData Data;
 
+    /// <summary>
+    /// The animation events (keyframes per named track).
+    /// </summary>
+    Array<Pair<String, StepCurve<AnimEventData>>> Events;
+
     /// <summary>
     /// Contains the mapping for every skeleton node to the animation data channels.
     /// Can be used for a simple lookup or to check if a given node is animated (unused nodes are using -1 index).
@@ -138,6 +163,11 @@ private:
 
     void OnSkinnedModelUnloaded(Asset* obj);
 
+public:
+
+    // [BinaryAsset]
+    void OnScriptingDispose() override;
+
 protected:
 
     // [BinaryAsset]

Source/Engine/Content/Assets/VisualScript.cpp

@@ -624,7 +624,9 @@ void VisualScriptExecutor::ProcessGroupFunction(Box* boxBase, Node* node, Value&
         {
             // Evaluate method parameter value from the current scope
             auto& scope = ThreadStacks.Get().Stack->Scope;
-            value = scope->Parameters[boxBase->ID - 1];
+            int32 index = boxBase->ID - 1;
+            if (index < scope->Parameters.Length())
+                value = scope->Parameters.Get()[index];
         }
         break;
     }

Source/Engine/Content/Storage/FlaxStorage.h

@@ -6,6 +6,7 @@
 #include "Engine/Core/Delegate.h"
 #include "Engine/Core/Types/String.h"
 #include "Engine/Core/Types/DateTime.h"
+#include "Engine/Core/Collections/Array.h"
 #include "Engine/Platform/CriticalSection.h"
 #include "Engine/Serialization/FileReadStream.h"
 #include "Engine/Threading/ThreadLocal.h"

Source/Engine/ContentExporters/ExportModel.cpp

@@ -34,7 +34,7 @@ ExportAssetResult AssetExporters::ExportModel(ExportAssetContext& context)
     DeleteMe<FileWriteStream> outputDeleteMe(output);
 
     const auto name = StringUtils::GetFileNameWithoutExtension(asset->GetPath()).ToStringAnsi();
-    output->WriteTextFormatted("# Exported model {0}\n", name.Get());
+    output->WriteText(StringAnsi::Format("# Exported model {0}\n", name.Get()));
 
     // Extract all meshes
     const auto& lod = asset->LODs[lodIndex];
@@ -63,12 +63,12 @@ ExportAssetResult AssetExporters::ExportModel(ExportAssetContext& context)
         }
         auto ib = stream.Read<byte>(indicesCount * ibStride);
 
-        output->WriteTextFormatted("# Mesh {0}\n", meshIndex);
+        output->WriteText(StringAnsi::Format("# Mesh {0}\n", meshIndex));
 
         for (uint32 i = 0; i < vertices; i++)
         {
             auto v = vb0[i].Position;
-            output->WriteTextFormatted("v {0} {1} {2}\n", v.X, v.Y, v.Z);
+            output->WriteText(StringAnsi::Format("v {0} {1} {2}\n", v.X, v.Y, v.Z));
         }
 
         output->WriteChar('\n');
@@ -76,7 +76,7 @@ ExportAssetResult AssetExporters::ExportModel(ExportAssetContext& context)
         for (uint32 i = 0; i < vertices; i++)
         {
             auto v = vb1[i].TexCoord;
-            output->WriteTextFormatted("vt {0} {1}\n", Float16Compressor::Decompress(v.X), Float16Compressor::Decompress(v.Y));
+            output->WriteText(StringAnsi::Format("vt {0} {1}\n", Float16Compressor::Decompress(v.X), Float16Compressor::Decompress(v.Y)));
         }
 
         output->WriteChar('\n');
@@ -84,7 +84,7 @@ ExportAssetResult AssetExporters::ExportModel(ExportAssetContext& context)
         for (uint32 i = 0; i < vertices; i++)
         {
             auto v = vb1[i].Normal.ToVector3() * 2.0f - 1.0f;
-            output->WriteTextFormatted("vn {0} {1} {2}\n", v.X, v.Y, v.Z);
+            output->WriteText(StringAnsi::Format("vn {0} {1} {2}\n", v.X, v.Y, v.Z));
         }
 
         output->WriteChar('\n');
@@ -97,7 +97,7 @@ ExportAssetResult AssetExporters::ExportModel(ExportAssetContext& context)
                 auto i0 = vertexStart + *t++;
                 auto i1 = vertexStart + *t++;
                 auto i2 = vertexStart + *t++;
-                output->WriteTextFormatted("f {0}/{0}/{0} {1}/{1}/{1} {2}/{2}/{2}\n", i0, i1, i2);
+                output->WriteText(StringAnsi::Format("f {0}/{0}/{0} {1}/{1}/{1} {2}/{2}/{2}\n", i0, i1, i2));
             }
         }
         else
@@ -108,7 +108,7 @@ ExportAssetResult AssetExporters::ExportModel(ExportAssetContext& context)
                 auto i0 = vertexStart + *t++;
                 auto i1 = vertexStart + *t++;
                 auto i2 = vertexStart + *t++;
-                output->WriteTextFormatted("f {0}/{0}/{0} {1}/{1}/{1} {2}/{2}/{2}\n", i0, i1, i2);
+                output->WriteText(StringAnsi::Format("f {0}/{0}/{0} {1}/{1}/{1} {2}/{2}/{2}\n", i0, i1, i2));
             }
         }
 
@@ -146,7 +146,7 @@ ExportAssetResult AssetExporters::ExportSkinnedModel(ExportAssetContext& context
     DeleteMe<FileWriteStream> outputDeleteMe(output);
 
     const auto name = StringUtils::GetFileNameWithoutExtension(asset->GetPath()).ToStringAnsi();
-    output->WriteTextFormatted("# Exported model {0}\n", name.Get());
+    output->WriteText(StringAnsi::Format("# Exported model {0}\n", name.Get()));
 
     // Extract all meshes
     const auto& lod = asset->LODs[lodIndex];
@@ -168,12 +168,12 @@ ExportAssetResult AssetExporters::ExportSkinnedModel(ExportAssetContext& context
         auto vb0 = stream.Read<VB0SkinnedElementType>(vertices);
         auto ib = stream.Read<byte>(indicesCount * ibStride);
 
-        output->WriteTextFormatted("# Mesh {0}\n", meshIndex);
+        output->WriteText(StringAnsi::Format("# Mesh {0}\n", meshIndex));
 
         for (uint32 i = 0; i < vertices; i++)
         {
             auto v = vb0[i].Position;
-            output->WriteTextFormatted("v {0} {1} {2}\n", v.X, v.Y, v.Z);
+            output->WriteText(StringAnsi::Format("v {0} {1} {2}\n", v.X, v.Y, v.Z));
         }
 
         output->WriteChar('\n');
@@ -181,7 +181,7 @@ ExportAssetResult AssetExporters::ExportSkinnedModel(ExportAssetContext& context
         for (uint32 i = 0; i < vertices; i++)
         {
             auto v = vb0[i].TexCoord;
-            output->WriteTextFormatted("vt {0} {1}\n", Float16Compressor::Decompress(v.X), Float16Compressor::Decompress(v.Y));
+            output->WriteText(StringAnsi::Format("vt {0} {1}\n", Float16Compressor::Decompress(v.X), Float16Compressor::Decompress(v.Y)));
         }
 
         output->WriteChar('\n');
@@ -189,7 +189,7 @@ ExportAssetResult AssetExporters::ExportSkinnedModel(ExportAssetContext& context
         for (uint32 i = 0; i < vertices; i++)
         {
             auto v = vb0[i].Normal.ToVector3() * 2.0f - 1.0f;
-            output->WriteTextFormatted("vn {0} {1} {2}\n", v.X, v.Y, v.Z);
+            output->WriteText(StringAnsi::Format("vn {0} {1} {2}\n", v.X, v.Y, v.Z));
         }
 
         output->WriteChar('\n');
@@ -202,7 +202,7 @@ ExportAssetResult AssetExporters::ExportSkinnedModel(ExportAssetContext& context
                 auto i0 = vertexStart + *t++;
                 auto i1 = vertexStart + *t++;
                 auto i2 = vertexStart + *t++;
-                output->WriteTextFormatted("f {0}/{0}/{0} {1}/{1}/{1} {2}/{2}/{2}\n", i0, i1, i2);
+                output->WriteText(StringAnsi::Format("f {0}/{0}/{0} {1}/{1}/{1} {2}/{2}/{2}\n", i0, i1, i2));
             }
         }
         else
@@ -213,7 +213,7 @@ ExportAssetResult AssetExporters::ExportSkinnedModel(ExportAssetContext& context
                 auto i0 = vertexStart + *t++;
                 auto i1 = vertexStart + *t++;
                 auto i2 = vertexStart + *t++;
-                output->WriteTextFormatted("f {0}/{0}/{0} {1}/{1}/{1} {2}/{2}/{2}\n", i0, i1, i2);
+                output->WriteText(StringAnsi::Format("f {0}/{0}/{0} {1}/{1}/{1} {2}/{2}/{2}\n", i0, i1, i2));
             }
         }
 

Source/Engine/Core/Log.cpp

@@ -11,6 +11,9 @@
 #include "Engine/Serialization/FileWriteStream.h"
 #include "Engine/Serialization/MemoryWriteStream.h"
 #include "Engine/Debug/Exceptions/Exceptions.h"
+#if USE_EDITOR
+#include "Engine/Core/Collections/Array.h"
+#endif
 #include <iostream>
 
 #define LOG_ENABLE_FILE (!PLATFORM_SWITCH)

Source/Engine/Core/Object.cpp

@@ -1,25 +0,0 @@
-// Copyright (c) 2012-2021 Wojciech Figat. All rights reserved.
-
-#include "Object.h"
-#include "ObjectsRemovalService.h"
-
-RemovableObject::~RemovableObject()
-{
-#if BUILD_DEBUG
-    // Prevent removing object that is still reverenced by the removal service
-    ASSERT(!ObjectsRemovalService::IsInPool(this));
-#endif
-}
-
-void RemovableObject::DeleteObjectNow()
-{
-    ObjectsRemovalService::Dereference(this);
-
-    OnDeleteObject();
-}
-
-void RemovableObject::DeleteObject(float timeToLive, bool useGameTime)
-{
-    // Add to deferred remove (or just update timeout but don't remove object here)
-    ObjectsRemovalService::Add(this, timeToLive, useGameTime);
-}

Source/Engine/Core/Object.h

@@ -37,30 +37,13 @@ public:
     /// <summary>
     /// Finalizes an instance of the <see cref="Object"/> class.
     /// </summary>
-    virtual ~Object()
+    virtual ~Object();
-    {
-    }
 
     /// <summary>
     /// Gets the string representation of this object.
     /// </summary>
     /// <returns>The string.</returns>
     virtual String ToString() const = 0;
-};
-
-/// <summary>
-/// Interface for removable Engine objects.
-/// </summary>
-/// <seealso cref="Object" />
-class FLAXENGINE_API RemovableObject : public Object
-{
-public:
-
-    /// <summary>
-    /// Virtual destructor but protected. Removable objects should be deleted using `DeleteObject` which supports deferred delete.
-    /// Note: it's unsafe to delete object using destructor it it has been marked for deferred delete.
-    /// </summary>
-    virtual ~RemovableObject();
 
     /// <summary>
     /// Deletes the object without queueing it to the ObjectsRemovalService.
@@ -68,7 +51,7 @@ public:
     void DeleteObjectNow();
 
     /// <summary>
-    /// Deletes the object.
+    /// Deletes the object (deferred).
     /// </summary>
     /// <param name="timeToLive">The time to live (in seconds). Use zero to kill it now.</param>
     /// <param name="useGameTime">True if unscaled game time for the object life timeout, otherwise false to use absolute time.</param>
@@ -82,3 +65,6 @@ public:
         Delete(this);
     }
 };
+
+// [Deprecated on 5.01.2022, expires on 5.01.2024]
+typedef Object RemovableObject;

Source/Engine/Core/ObjectsRemovalService.cpp

@@ -16,8 +16,8 @@ namespace ObjectsRemovalServiceImpl
     CriticalSection NewItemsLocker;
     DateTime LastUpdate;
     float LastUpdateGameTime;
-    Dictionary<RemovableObject*, float> Pool(8192);
+    Dictionary<Object*, float> Pool(8192);
-    Dictionary<RemovableObject*, float> NewItemsPool(2048);
+    Dictionary<Object*, float> NewItemsPool(2048);
 }
 
 using namespace ObjectsRemovalServiceImpl;
@@ -38,7 +38,7 @@ public:
 
 ObjectsRemovalServiceService ObjectsRemovalServiceServiceInstance;
 
-bool ObjectsRemovalService::IsInPool(RemovableObject* obj)
+bool ObjectsRemovalService::IsInPool(Object* obj)
 {
     if (!IsReady)
         return false;
@@ -67,7 +67,7 @@ bool ObjectsRemovalService::HasNewItemsForFlush()
     return result;
 }
 
-void ObjectsRemovalService::Dereference(RemovableObject* obj)
+void ObjectsRemovalService::Dereference(Object* obj)
 {
     if (!IsReady)
         return;
@@ -81,7 +81,7 @@ void ObjectsRemovalService::Dereference(RemovableObject* obj)
     PoolLocker.Unlock();
 }
 
-void ObjectsRemovalService::Add(RemovableObject* obj, float timeToLive, bool useGameTime)
+void ObjectsRemovalService::Add(Object* obj, float timeToLive, bool useGameTime)
 {
     ScopeLock lock(NewItemsLocker);
 
@@ -213,3 +213,24 @@ void ObjectsRemovalServiceService::Dispose()
 
     IsReady = false;
 }
+
+Object::~Object()
+{
+#if BUILD_DEBUG
+    // Prevent removing object that is still reverenced by the removal service
+    ASSERT(!ObjectsRemovalService::IsInPool(this));
+#endif
+}
+
+void Object::DeleteObjectNow()
+{
+    ObjectsRemovalService::Dereference(this);
+
+    OnDeleteObject();
+}
+
+void Object::DeleteObject(float timeToLive, bool useGameTime)
+{
+    // Add to deferred remove (or just update timeout but don't remove object here)
+    ObjectsRemovalService::Add(this, timeToLive, useGameTime);
+}

Source/Engine/Core/ObjectsRemovalService.h

@@ -16,7 +16,7 @@ public:
     /// </summary>
     /// <param name="obj">The object.</param>
     /// <returns>True if object has been registered in the pool for the removing, otherwise false.</returns>
-    static bool IsInPool(RemovableObject* obj);
+    static bool IsInPool(Object* obj);
 
     /// <summary>
     /// Determines whether any object has been registered to be removed from pool (requests are flushed on Flush call).
@@ -28,7 +28,7 @@ public:
     /// Removes the specified object from the dead pool (clears the reference to it).
     /// </summary>
     /// <param name="obj">The object.</param>
-    static void Dereference(RemovableObject* obj);
+    static void Dereference(Object* obj);
 
     /// <summary>
     /// Adds the specified object to the dead pool.
@@ -36,7 +36,7 @@ public:
     /// <param name="obj">The object.</param>
     /// <param name="timeToLive">The time to live (in seconds).</param>
     /// <param name="useGameTime">True if unscaled game time for the object life timeout, otherwise false to use absolute time.</param>
-    static void Add(RemovableObject* obj, float timeToLive = 1.0f, bool useGameTime = false);
+    static void Add(Object* obj, float timeToLive = 1.0f, bool useGameTime = false);
 
     /// <summary>
     /// Flushes the objects pool removing objects marked to remove now (with negative or zero time to live).

Source/Engine/Core/Types/String.h

@@ -337,6 +337,8 @@ public:
     void ReserveSpace(int32 length)
     {
         ASSERT(length >= 0);
+        if (length == _length)
+            return;
         Platform::Free(_data);
         if (length != 0)
         {

Source/Engine/Foliage/FoliageType.cpp

@@ -7,7 +7,7 @@
 #include "Foliage.h"
 
 FoliageType::FoliageType()
-    : PersistentScriptingObject(SpawnParams(Guid::New(), TypeInitializer))
+    : ScriptingObject(SpawnParams(Guid::New(), TypeInitializer))
     , Foliage(nullptr)
     , Index(-1)
 {

Source/Engine/Foliage/FoliageType.h

@@ -41,7 +41,7 @@ API_ENUM() enum class FoliageScalingModes
 /// <summary>
 /// Foliage mesh instances type descriptor. Defines the shared properties of the spawned mesh instances.
 /// </summary>
-API_CLASS(Sealed, NoSpawn) class FLAXENGINE_API FoliageType : public PersistentScriptingObject, public ISerializable
+API_CLASS(Sealed, NoSpawn) class FLAXENGINE_API FoliageType : public ScriptingObject, public ISerializable
 {
 DECLARE_SCRIPTING_TYPE_NO_SPAWN(FoliageType);
     friend Foliage;

Source/Engine/Graphics/GPUAdapter.h

@@ -14,13 +14,13 @@
 /// <summary>
 /// Interface for GPU device adapter.
 /// </summary>
-API_CLASS(NoSpawn, Attributes="HideInEditor") class FLAXENGINE_API GPUAdapter : public PersistentScriptingObject
+API_CLASS(NoSpawn, Attributes="HideInEditor") class FLAXENGINE_API GPUAdapter : public ScriptingObject
 {
 DECLARE_SCRIPTING_TYPE_NO_SPAWN(GPUDevice);
 public:
 
     GPUAdapter()
-        : PersistentScriptingObject(SpawnParams(Guid::New(), TypeInitializer))
+        : ScriptingObject(SpawnParams(Guid::New(), TypeInitializer))
     {
     }
 

Source/Engine/Graphics/GPUContext.cpp

@@ -6,7 +6,7 @@
 #include "Textures/GPUTexture.h"
 
 GPUContext::GPUContext(GPUDevice* device)
-    : PersistentScriptingObject(ScriptingObjectSpawnParams(Guid::New(), TypeInitializer))
+    : ScriptingObject(ScriptingObjectSpawnParams(Guid::New(), TypeInitializer))
     , _device(device)
 {
 }

Source/Engine/Graphics/GPUContext.h

@@ -113,7 +113,7 @@ DECLARE_SCRIPTING_TYPE_NO_SPAWN(GPUDrawIndexedIndirectArgs);
 /// <summary>
 /// Interface for GPU device context that can record and send graphics commands to the GPU in a sequence.
 /// </summary>
-API_CLASS(Sealed, NoSpawn) class FLAXENGINE_API GPUContext : public PersistentScriptingObject
+API_CLASS(Sealed, NoSpawn) class FLAXENGINE_API GPUContext : public ScriptingObject
 {
 DECLARE_SCRIPTING_TYPE_NO_SPAWN(GPUContext);
 private:

Source/Engine/Graphics/GPUDevice.cpp

@@ -173,12 +173,12 @@ GPUPipelineState::Description GPUPipelineState::Description::DefaultFullscreenTr
 };
 
 GPUResource::GPUResource()
-    : PersistentScriptingObject(SpawnParams(Guid::New(), GPUResource::TypeInitializer))
+    : ScriptingObject(SpawnParams(Guid::New(), GPUResource::TypeInitializer))
 {
 }
 
 GPUResource::GPUResource(const SpawnParams& params)
-    : PersistentScriptingObject(params)
+    : ScriptingObject(params)
 {
 }
 
@@ -241,7 +241,7 @@ void GPUResource::OnDeleteObject()
 {
     ReleaseGPU();
 
-    PersistentScriptingObject::OnDeleteObject();
+    ScriptingObject::OnDeleteObject();
 }
 
 double GPUResourceView::DummyLastRenderTime = -1;
@@ -262,7 +262,7 @@ struct GPUDevice::PrivateData
 GPUDevice* GPUDevice::Instance = nullptr;
 
 GPUDevice::GPUDevice(RendererType type, ShaderProfile profile)
-    : PersistentScriptingObject(SpawnParams(Guid::New(), TypeInitializer))
+    : ScriptingObject(SpawnParams(Guid::New(), TypeInitializer))
     , _state(DeviceState::Missing)
     , _isRendering(false)
     , _wasVSyncUsed(false)

Source/Engine/Graphics/GPUDevice.h

@@ -29,7 +29,7 @@ class MaterialBase;
 /// <summary>
 /// Graphics device object for rendering on GPU.
 /// </summary>
-API_CLASS(Sealed, NoSpawn) class FLAXENGINE_API GPUDevice : public PersistentScriptingObject
+API_CLASS(Sealed, NoSpawn) class FLAXENGINE_API GPUDevice : public ScriptingObject
 {
 DECLARE_SCRIPTING_TYPE_NO_SPAWN(GPUDevice);
 public:

Source/Engine/Graphics/GPUResource.h

@@ -15,7 +15,7 @@
 /// <summary>
 /// The base class for all GPU resources.
 /// </summary>
-API_CLASS(Abstract, NoSpawn) class FLAXENGINE_API GPUResource : public PersistentScriptingObject
+API_CLASS(Abstract, NoSpawn) class FLAXENGINE_API GPUResource : public ScriptingObject
 {
 DECLARE_SCRIPTING_TYPE_NO_SPAWN(GPUResource);
 public:
@@ -108,7 +108,7 @@ protected:
 
 public:
 
-    // [PersistentScriptingObject]
+    // [ScriptingObject]
     String ToString() const override;
     void OnDeleteObject() override;
 };
@@ -186,14 +186,14 @@ public:
 /// <summary>
 /// Interface for GPU resources views. Shared base class for texture and buffer views.
 /// </summary>
-API_CLASS(Abstract, NoSpawn, Attributes="HideInEditor") class FLAXENGINE_API GPUResourceView : public PersistentScriptingObject
+API_CLASS(Abstract, NoSpawn, Attributes="HideInEditor") class FLAXENGINE_API GPUResourceView : public ScriptingObject
 {
 DECLARE_SCRIPTING_TYPE_NO_SPAWN(GPUResourceView);
 protected:
     static double DummyLastRenderTime;
 
     explicit GPUResourceView(const SpawnParams& params)
-        : PersistentScriptingObject(params)
+        : ScriptingObject(params)
         , LastRenderTime(&DummyLastRenderTime)
     {
     }

Source/Engine/Graphics/Materials/MaterialParams.h

@@ -167,9 +167,9 @@ struct SerializedMaterialParam
 /// <summary>
 /// Material variable object. Allows to modify material parameter value at runtime.
 /// </summary>
-API_CLASS(NoSpawn) class FLAXENGINE_API MaterialParameter : public PersistentScriptingObject
+API_CLASS(NoSpawn) class FLAXENGINE_API MaterialParameter : public ScriptingObject
 {
-DECLARE_SCRIPTING_TYPE_WITH_CONSTRUCTOR_IMPL(MaterialParameter, PersistentScriptingObject);
+DECLARE_SCRIPTING_TYPE_WITH_CONSTRUCTOR_IMPL(MaterialParameter, ScriptingObject);
     friend MaterialParams;
     friend MaterialInstance;
 private:

Source/Engine/Graphics/Models/MaterialSlot.h

@@ -10,9 +10,9 @@
 /// <summary>
 /// The material slot descriptor that specifies how to render geometry using it.
 /// </summary>
-API_CLASS(NoSpawn) class FLAXENGINE_API MaterialSlot : public PersistentScriptingObject
+API_CLASS(NoSpawn) class FLAXENGINE_API MaterialSlot : public ScriptingObject
 {
-DECLARE_SCRIPTING_TYPE_WITH_CONSTRUCTOR_IMPL(MaterialSlot, PersistentScriptingObject);
+DECLARE_SCRIPTING_TYPE_WITH_CONSTRUCTOR_IMPL(MaterialSlot, ScriptingObject);
 
     /// <summary>
     /// The material to use for rendering.

Source/Engine/Graphics/Models/MeshBase.h

@@ -14,7 +14,7 @@ class ModelBase;
 /// <summary>
 /// Base class for model resources meshes.
 /// </summary>
-API_CLASS(Abstract, NoSpawn) class FLAXENGINE_API MeshBase : public PersistentScriptingObject
+API_CLASS(Abstract, NoSpawn) class FLAXENGINE_API MeshBase : public ScriptingObject
 {
 DECLARE_SCRIPTING_TYPE_MINIMAL(MeshBase);
 protected:
@@ -30,7 +30,7 @@ protected:
     bool _use16BitIndexBuffer;
 
     explicit MeshBase(const SpawnParams& params)
-        : PersistentScriptingObject(params)
+        : ScriptingObject(params)
     {
     }
 

Source/Engine/Graphics/Models/ModelLOD.h

@@ -10,9 +10,9 @@ class MemoryReadStream;
 /// <summary>
 /// Represents single Level Of Detail for the model. Contains a collection of the meshes.
 /// </summary>
-API_CLASS(NoSpawn) class FLAXENGINE_API ModelLOD : public PersistentScriptingObject
+API_CLASS(NoSpawn) class FLAXENGINE_API ModelLOD : public ScriptingObject
 {
-DECLARE_SCRIPTING_TYPE_WITH_CONSTRUCTOR_IMPL(ModelLOD, PersistentScriptingObject);
+DECLARE_SCRIPTING_TYPE_WITH_CONSTRUCTOR_IMPL(ModelLOD, ScriptingObject);
     friend Model;
     friend Mesh;
 private:

Source/Engine/Graphics/Models/SkinnedModelLOD.h

@@ -10,9 +10,9 @@ class MemoryReadStream;
 /// <summary>
 /// Represents single Level Of Detail for the skinned model. Contains a collection of the meshes.
 /// </summary>
-API_CLASS(NoSpawn) class FLAXENGINE_API SkinnedModelLOD : public PersistentScriptingObject
+API_CLASS(NoSpawn) class FLAXENGINE_API SkinnedModelLOD : public ScriptingObject
 {
-DECLARE_SCRIPTING_TYPE_WITH_CONSTRUCTOR_IMPL(SkinnedModelLOD, PersistentScriptingObject);
+DECLARE_SCRIPTING_TYPE_WITH_CONSTRUCTOR_IMPL(SkinnedModelLOD, ScriptingObject);
     friend SkinnedModel;
 private:
 

Source/Engine/Graphics/RenderBuffers.cpp

@@ -8,7 +8,7 @@
 #include "Engine/Engine/Engine.h"
 
 RenderBuffers::RenderBuffers(const SpawnParams& params)
-    : PersistentScriptingObject(params)
+    : ScriptingObject(params)
 {
 #define CREATE_TEXTURE(name) name = GPUDevice::Instance->CreateTexture(TEXT(#name)); _resources.Add(name)
     CREATE_TEXTURE(DepthBuffer);
@@ -183,8 +183,3 @@ void RenderBuffers::Release()
     UPDATE_LAZY_KEEP_RT(LuminanceMap);
 #undef UPDATE_LAZY_KEEP_RT
 }
-
-String RenderBuffers::ToString() const
-{
-    return TEXT("RenderBuffers");
-}

Source/Engine/Graphics/RenderBuffers.h

@@ -19,7 +19,7 @@
 /// <summary>
 /// The scene rendering buffers container.
 /// </summary>
-API_CLASS() class FLAXENGINE_API RenderBuffers : public PersistentScriptingObject
+API_CLASS() class FLAXENGINE_API RenderBuffers : public ScriptingObject
 {
 DECLARE_SCRIPTING_TYPE(RenderBuffers);
 protected:
@@ -175,9 +175,4 @@ public:
     /// Release the buffers data.
     /// </summary>
     API_FUNCTION() void Release();
-
-public:
-
-    // [PersistentScriptingObject]
-    String ToString() const override;
 };

Source/Engine/Graphics/RenderTask.cpp

@@ -82,7 +82,7 @@ void RenderTask::DrawAll()
 }
 
 RenderTask::RenderTask(const SpawnParams& params)
-    : PersistentScriptingObject(params)
+    : ScriptingObject(params)
 {
     // Register
     TasksLocker.Lock();

Source/Engine/Graphics/RenderTask.h

@@ -24,7 +24,7 @@ class Actor;
 /// <summary>
 /// Allows to perform custom rendering using graphics pipeline.
 /// </summary>
-API_CLASS() class FLAXENGINE_API RenderTask : public PersistentScriptingObject
+API_CLASS() class FLAXENGINE_API RenderTask : public ScriptingObject
 {
 DECLARE_SCRIPTING_TYPE(RenderTask);
 

Source/Engine/Input/InputDevice.h

@@ -11,7 +11,7 @@
 /// <summary>
 /// Base class for all input device objects.
 /// </summary>
-API_CLASS(Abstract, NoSpawn) class FLAXENGINE_API InputDevice : public PersistentScriptingObject
+API_CLASS(Abstract, NoSpawn) class FLAXENGINE_API InputDevice : public ScriptingObject
 {
 DECLARE_SCRIPTING_TYPE_NO_SPAWN(InputDevice);
 public:
@@ -86,7 +86,7 @@ protected:
     EventQueue _queue;
 
     explicit InputDevice(const SpawnParams& params, const StringView& name)
-        : PersistentScriptingObject(params)
+        : ScriptingObject(params)
         , _name(name)
     {
     }

Source/Engine/Level/Actor.h

@@ -971,7 +971,7 @@ private:
 
 public:
 
-    // [PersistentScriptingObject]
+    // [ScriptingObject]
     String ToString() const override;
     void OnDeleteObject() override;
 

Source/Engine/Level/Level.cpp

@@ -36,6 +36,7 @@
 #include "Editor/Editor.h"
 #include "Engine/Platform/MessageBox.h"
 #include "Engine/Engine/CommandLine.h"
+#include "Engine/Serialization/JsonSerializer.h"
 #endif
 
 bool LayersMask::HasLayer(const StringView& layerName) const
@@ -74,11 +75,25 @@ public:
     }
 };
 
+#if USE_EDITOR
+
+struct ScriptsReloadObject
+{
+    StringAnsi TypeName;
+    ScriptingObject** Object;
+    Array<byte> Data;
+};
+
+#endif
+
 namespace LevelImpl
 {
     Array<SceneAction*> _sceneActions;
     CriticalSection _sceneActionsLocker;
     DateTime _lastSceneLoadTime(0);
+#if USE_EDITOR
+    Array<ScriptsReloadObject> ScriptsReloadObjects;
+#endif
 
     void CallSceneEvent(SceneEventType eventType, Scene* scene, Guid sceneId);
 
@@ -128,9 +143,11 @@ Delegate<Scene*, const Guid&> Level::SceneLoaded;
 Delegate<Scene*, const Guid&> Level::SceneLoadError;
 Delegate<Scene*, const Guid&> Level::SceneUnloading;
 Delegate<Scene*, const Guid&> Level::SceneUnloaded;
+#if USE_EDITOR
 Action Level::ScriptsReloadStart;
 Action Level::ScriptsReload;
 Action Level::ScriptsReloadEnd;
+#endif
 Array<String> Level::Tags;
 String Level::Layers[32];
 
@@ -559,6 +576,24 @@ public:
         Level::ScriptsReload();
         Scripting::Reload();
 
+        // Restore objects
+        for (auto& e : ScriptsReloadObjects)
+        {
+            const ScriptingTypeHandle typeHandle = Scripting::FindScriptingType(e.TypeName);
+            *e.Object = ScriptingObject::NewObject(typeHandle);
+            if (!*e.Object)
+            {
+                LOG(Warning, "Failed to restore hot-reloaded object of type {0}.", String(e.TypeName));
+                continue;
+            }
+            auto* serializable = ScriptingObject::ToInterface<ISerializable>(*e.Object);
+            if (serializable && e.Data.HasItems())
+            {
+                JsonSerializer::LoadFromBytes(serializable, e.Data, FLAXENGINE_VERSION_BUILD);
+            }
+        }
+        ScriptsReloadObjects.Clear();
+
         // Restore scenes (from memory)
         for (int32 i = 0; i < scenesCount; i++)
         {
@@ -595,6 +630,20 @@ public:
     }
 };
 
+void Level::ScriptsReloadRegisterObject(ScriptingObject*& obj)
+{
+    if (!obj)
+        return;
+    auto& e = ScriptsReloadObjects.AddOne();
+    e.Object = &obj;
+    e.TypeName = obj->GetType().Fullname;
+    if (auto* serializable = ScriptingObject::ToInterface<ISerializable>(obj))
+        e.Data = JsonSerializer::SaveToBytes(serializable);
+    ScriptingObject* o = obj;
+    obj = nullptr;
+    o->DeleteObjectNow();
+}
+
 #endif
 
 class SpawnActorAction : public SceneAction
@@ -605,9 +654,9 @@ public:
     ScriptingObjectReference<Actor> ParentActor;
 
     SpawnActorAction(Actor* actor, Actor* parent)
+        : TargetActor(actor)
+        , ParentActor(parent)
     {
-        TargetActor = actor;
-        ParentActor = parent;
     }
 
     bool Do() const override
@@ -623,8 +672,8 @@ public:
     ScriptingObjectReference<Actor> TargetActor;
 
     DeleteActorAction(Actor* actor)
+        : TargetActor(actor)
     {
-        TargetActor = actor;
     }
 
     bool Do() const override

Source/Engine/Level/Level.h

@@ -215,6 +215,8 @@ public:
     /// </summary>
     API_EVENT() static Delegate<Scene*, const Guid&> SceneUnloaded;
 
+#if USE_EDITOR
+
     /// <summary>
     /// Fired when scene starts reloading scripts.
     /// </summary>
@@ -230,6 +232,14 @@ public:
     /// </summary>
     API_EVENT() static Action ScriptsReloadEnd;
 
+    /// <summary>
+    /// Adds object to preserve during scripts reload. Called during ScriptsReloadStart event to serialize and destroy the object that should be restored when scripts reload ends.
+    /// </summary>
+    /// <param name="obj">Reference to the object to preserve during the scripting reload.</param>
+    static void ScriptsReloadRegisterObject(ScriptingObject*& obj);
+
+#endif
+
 public:
 
     /// <summary>

Source/Engine/Level/SceneObject.h

@@ -55,7 +55,7 @@ typedef Dictionary<Guid, Actor*, HeapAllocation> ActorsLookup;
 /// <summary>
 /// Base class for objects that are parts of the scene (actors and scripts).
 /// </summary>
-API_CLASS(Abstract, NoSpawn) class FLAXENGINE_API SceneObject : public PersistentScriptingObject, public ISerializable
+API_CLASS(Abstract, NoSpawn) class FLAXENGINE_API SceneObject : public ScriptingObject, public ISerializable
 {
 DECLARE_SCRIPTING_TYPE_NO_SPAWN(SceneObject);
     friend PrefabInstanceData;
@@ -64,7 +64,7 @@ DECLARE_SCRIPTING_TYPE_NO_SPAWN(SceneObject);
     friend ScriptsFactory;
     friend SceneTicking;
 public:
-    typedef PersistentScriptingObject Base;
+    typedef ScriptingObject Base;
 
     // Scene Object lifetime flow:
     // - Create

Source/Engine/Networking/Drivers/ENetDriver.cpp

@@ -51,7 +51,7 @@ void SendPacketToPeer(ENetPeer* peer, const NetworkChannelType channelType, cons
 }
 
 ENetDriver::ENetDriver(const SpawnParams& params)
-    : PersistentScriptingObject(params)
+    : ScriptingObject(params)
 {
 }
 

Source/Engine/Networking/Drivers/ENetDriver.h

@@ -13,7 +13,7 @@
 /// <summary>
 /// Low-level network transport interface implementation based on ENet library.
 /// </summary>
-API_CLASS(Namespace="FlaxEngine.Networking", Sealed) class FLAXENGINE_API ENetDriver : public PersistentScriptingObject, public INetworkDriver
+API_CLASS(Namespace="FlaxEngine.Networking", Sealed) class FLAXENGINE_API ENetDriver : public ScriptingObject, public INetworkDriver
 {
 DECLARE_SCRIPTING_TYPE(ENetDriver);
 public:

Source/Engine/Networking/NetworkPeer.h

@@ -11,7 +11,7 @@
 /// <summary>
 /// Low-level network peer class. Provides server-client communication functions, message processing and sending.
 /// </summary>
-API_CLASS(sealed, NoSpawn, Namespace = "FlaxEngine.Networking") class FLAXENGINE_API NetworkPeer final : public PersistentScriptingObject
+API_CLASS(sealed, NoSpawn, Namespace = "FlaxEngine.Networking") class FLAXENGINE_API NetworkPeer final : public ScriptingObject
 {
 DECLARE_SCRIPTING_TYPE_NO_SPAWN(NetworkPeer);
     friend class NetworkManager;
@@ -30,7 +30,7 @@ public:
     /// Initializes a new instance of the <see cref="NetworkPeer"/> class.
     /// </summary>
     NetworkPeer()
-        : PersistentScriptingObject(SpawnParams(Guid::New(), TypeInitializer))
+        : ScriptingObject(SpawnParams(Guid::New(), TypeInitializer))
     {
     }
 

Source/Engine/Particles/ParticleEffect.h

@@ -12,7 +12,7 @@
 /// <summary>
 /// Particle system parameter.
 /// </summary>
-API_CLASS(NoSpawn) class ParticleEffectParameter : public PersistentScriptingObject
+API_CLASS(NoSpawn) class ParticleEffectParameter : public ScriptingObject
 {
 DECLARE_SCRIPTING_TYPE_NO_SPAWN(ParticleEffectParameter);
     friend ParticleEffect;
@@ -30,7 +30,7 @@ public:
     /// Initializes a new instance of the <see cref="ParticleEffectParameter"/> class.
     /// </summary>
     ParticleEffectParameter()
-        : PersistentScriptingObject(SpawnParams(Guid::New(), TypeInitializer))
+        : ScriptingObject(SpawnParams(Guid::New(), TypeInitializer))
     {
     }
 

Source/Engine/Physics/Colliders/CharacterController.cpp

@@ -173,6 +173,7 @@ CharacterController::CollisionFlags CharacterController::Move(const Vector3& dis
         filters.mFilterData = (PxFilterData*)&_filterData;
         filters.mFilterCallback = Physics::GetCharacterQueryFilterCallback();
         filters.mFilterFlags = PxQueryFlag::eDYNAMIC | PxQueryFlag::eSTATIC | PxQueryFlag::ePREFILTER;
+        filters.mCCTFilterCallback = Physics::GetCharacterControllerFilterCallback();
 
         result = (CollisionFlags)(byte)_controller->move(C2P(displacement), _minMoveDistance, deltaTime, filters);
         _lastFlags = result;

Source/Engine/Physics/Physics.Queries.cpp

@@ -6,6 +6,8 @@
 #include "Actors/PhysicsColliderActor.h"
 #include <ThirdParty/PhysX/PxScene.h>
 #include <ThirdParty/PhysX/PxQueryFiltering.h>
+#include <ThirdParty/PhysX/PxRigidDynamic.h>
+#include <ThirdParty/PhysX/characterkinematic/PxController.h>
 
 // Temporary result buffer size
 #define HIT_BUFFER_SIZE	128
@@ -217,6 +219,52 @@ public:
     }
 };
 
+class CharacterControllerFilter : public PxControllerFilterCallback
+{
+private:
+
+    PxShape* getShape(const PxController& controller)
+    {
+        PxRigidDynamic* actor = controller.getActor();
+
+        // Early out if no actor or no shapes
+        if (!actor || actor->getNbShapes() < 1)
+            return nullptr;
+
+        // Get first shape only.
+        PxShape* shape = nullptr;
+        actor->getShapes(&shape, 1);
+
+        return shape;
+    }
+
+public:
+
+    bool filter(const PxController& a, const PxController& b) override
+    {
+        // Early out to avoid crashing
+        PxShape* shapeA = getShape(a);
+        if (!shapeA)
+            return false;
+
+        PxShape* shapeB = getShape(b);
+        if (!shapeB)
+            return false;
+
+        // Let triggers through
+        if (PxFilterObjectIsTrigger(shapeB->getFlags()))
+            return false;
+
+        // Trigger the contact callback for pairs (A,B) where the filtermask of A contains the ID of B and vice versa
+        const PxFilterData shapeFilterA = shapeA->getQueryFilterData();
+        const PxFilterData shapeFilterB = shapeB->getQueryFilterData();
+        if (shapeFilterA.word0 & shapeFilterB.word1)
+            return true;
+
+        return false;
+    }
+};
+
 PxQueryFilterCallback* Physics::GetQueryFilterCallback()
 {
     static QueryFilter Filter;
@@ -229,6 +277,12 @@ PxQueryFilterCallback* Physics::GetCharacterQueryFilterCallback()
     return &Filter;
 }
 
+PxControllerFilterCallback* Physics::GetCharacterControllerFilterCallback()
+{
+    static CharacterControllerFilter Filter;
+    return &Filter;
+}
+
 bool Physics::RayCast(const Vector3& origin, const Vector3& direction, const float maxDistance, uint32 layerMask, bool hitTriggers)
 {
     // Prepare data

Source/Engine/Physics/Physics.h

@@ -112,6 +112,11 @@ DECLARE_SCRIPTING_TYPE_NO_SPAWN(Physics);
     /// </summary>
     static PxQueryFilterCallback* GetCharacterQueryFilterCallback();
 
+    /// <summary>
+    /// Gets the default controller filter callback used for the character controller collisions detection.
+    /// </summary>
+    static PxControllerFilterCallback* GetCharacterControllerFilterCallback();
+
     /// <summary>
     /// Gets the default physical material.
     /// </summary>

Source/Engine/Physics/Types.h

@@ -39,6 +39,7 @@ namespace physx
     class PxController;
     class PxCapsuleController;
     class PxQueryFilterCallback;
+    class PxControllerFilterCallback;
     class PxHeightField;
     struct PxFilterData;
     struct PxRaycastHit;

Source/Engine/Platform/Base/PlatformBase.cpp

@@ -112,7 +112,7 @@ UserBase::UserBase(const String& name)
 }
 
 UserBase::UserBase(const SpawnParams& params, const String& name)
-    : PersistentScriptingObject(params)
+    : ScriptingObject(params)
     , _name(name)
 {
 }

Source/Engine/Platform/Base/UserBase.h

@@ -10,7 +10,7 @@ API_INJECT_CPP_CODE("#include \"Engine/Platform/User.h\"");
 /// <summary>
 /// Native platform user object.
 /// </summary>
-API_CLASS(NoSpawn, NoConstructor, Sealed, Name="User") class FLAXENGINE_API UserBase : public PersistentScriptingObject
+API_CLASS(NoSpawn, NoConstructor, Sealed, Name="User") class FLAXENGINE_API UserBase : public ScriptingObject
 {
 DECLARE_SCRIPTING_TYPE_NO_SPAWN(UserBase);
 protected:

Source/Engine/Platform/Base/WindowBase.cpp

@@ -87,7 +87,7 @@
 #endif
 
 WindowBase::WindowBase(const CreateWindowSettings& settings)
-    : PersistentScriptingObject(SpawnParams(Guid::New(), TypeInitializer))
+    : ScriptingObject(SpawnParams(Guid::New(), TypeInitializer))
     , _visible(false)
     , _minimized(false)
     , _maximized(false)
@@ -190,7 +190,7 @@ void WindowBase::OnDeleteObject()
     SAFE_DELETE(_swapChain);
 
     // Base
-    PersistentScriptingObject::OnDeleteObject();
+    ScriptingObject::OnDeleteObject();
 }
 
 bool WindowBase::GetRenderingEnabled() const

Source/Engine/Platform/Base/WindowBase.h

@@ -269,7 +269,7 @@ API_INJECT_CPP_CODE("#include \"Engine/Platform/Window.h\"");
 /// Native platform window object.
 /// </summary>
 API_CLASS(NoSpawn, NoConstructor, Sealed, Name="Window")
-class FLAXENGINE_API WindowBase : public PersistentScriptingObject
+class FLAXENGINE_API WindowBase : public ScriptingObject
 {
 DECLARE_SCRIPTING_TYPE_NO_SPAWN(WindowBase);
     friend GPUSwapChain;
@@ -949,7 +949,7 @@ private:
 
 public:
 
-    // [PersistentScriptingObject]
+    // [ScriptingObject]
     String ToString() const override;
     void OnDeleteObject() override;
 };

Source/Engine/Renderer/RenderList.cpp

@@ -369,7 +369,7 @@ bool DrawCallsList::IsEmpty() const
 }
 
 RenderList::RenderList(const SpawnParams& params)
-    : PersistentScriptingObject(params)
+    : ScriptingObject(params)
     , DirectionalLights(4)
     , PointLights(32)
     , SpotLights(32)

Source/Engine/Renderer/RenderList.h

@@ -322,7 +322,7 @@ struct DrawCallsList
 /// <summary>
 /// Rendering cache container object for the draw calls collecting, sorting and executing.
 /// </summary>
-API_CLASS(Sealed) class FLAXENGINE_API RenderList : public PersistentScriptingObject
+API_CLASS(Sealed) class FLAXENGINE_API RenderList : public ScriptingObject
 {
 DECLARE_SCRIPTING_TYPE(RenderList);
 

Source/Engine/Scripting/Attributes/Editor/TypeReferenceAttribute.cs

@@ -5,7 +5,7 @@ using System;
 namespace FlaxEngine
 {
     /// <summary>
-    /// Specifies a options for an type reference picker in the editor. Allows to customize view or provide custom value assign policy (eg/ restrict types to inherit from a given type).
+    /// Specifies a options for an type reference picker in the editor. Allows to customize view or provide custom value assign policy (eg. restrict types to inherit from a given type).
     /// </summary>
     /// <seealso cref="System.Attribute" />
     [AttributeUsage(AttributeTargets.Field | AttributeTargets.Property | AttributeTargets.Parameter)]

Source/Engine/Scripting/ManagedCLR/MUtils.h

@@ -197,7 +197,7 @@ struct MConverter<T*, typename TEnableIf<TIsBaseOf<class ScriptingObject, T>::Va
 
 // Converter for Scripting Objects (collection of values).
 template<typename T>
-struct MConverter<T, typename TEnableIf<TIsBaseOf<class PersistentScriptingObject, T>::Value>::Type>
+struct MConverter<T, typename TEnableIf<TIsBaseOf<class ScriptingObject, T>::Value>::Type>
 {
     MonoObject* Box(const T& data, MonoClass* klass)
     {

Source/Engine/Scripting/Script.h

@@ -134,7 +134,7 @@ private:
 
 public:
 
-    // [PersistentScriptingObject]
+    // [ScriptingObject]
     String ToString() const override;
     void OnDeleteObject() override;
 

Source/Engine/Scripting/ScriptingObject.cpp

@@ -38,20 +38,32 @@ ScriptingObject::ScriptingObject(const SpawnParams& params)
 
 ScriptingObject::~ScriptingObject()
 {
-    // Ensure that GC handle is empty
-    ASSERT(_gcHandle == 0);
-
-    // Ensure that object has been already unregistered
-    if (IsRegistered())
-        UnregisterObject();
-
     Deleted(this);
 
+    // Get rid of managed object
+    ScriptingObject::DestroyManaged();
+    ASSERT(_gcHandle == 0);
+
     // Handle custom scripting objects removing
     if (Flags & ObjectFlags::IsCustomScriptingType)
     {
         _type.Module->OnObjectDeleted(this);
     }
+
+    // Ensure that object has been already unregistered
+    if (IsRegistered())
+        UnregisterObject();
+}
+
+ScriptingObject* ScriptingObject::NewObject(const ScriptingTypeHandle& typeHandle)
+{
+    if (!typeHandle)
+        return nullptr;
+    auto& type = typeHandle.GetType();
+    if (type.Type != ScriptingTypes::Script)
+        return nullptr;
+    const ScriptingObjectSpawnParams params(Guid::New(), typeHandle);
+    return type.Script.Spawn(params);
 }
 
 MObject* ScriptingObject::GetManagedInstance() const
@@ -207,18 +219,49 @@ void ScriptingObject::OnManagedInstanceDeleted()
     // Unregister object
     if (IsRegistered())
         UnregisterObject();
-
-    // Self destruct
-    DeleteObject();
 }
 
 void ScriptingObject::OnScriptingDispose()
 {
     // Delete C# object
+    if (IsRegistered())
+        UnregisterObject();
     DestroyManaged();
+}
 
-    // Delete C++ object
+bool ScriptingObject::CreateManaged()
-    DeleteObject();
+{
+#if USE_MONO
+    MonoObject* managedInstance = CreateManagedInternal();
+    if (!managedInstance)
+        return true;
+
+    // Prevent form object GC destruction
+    auto handle = mono_gchandle_new(managedInstance, false);
+    auto oldHandle = Platform::InterlockedCompareExchange((int32*)&_gcHandle, *(int32*)&handle, 0);
+    if (*(uint32*)&oldHandle != 0)
+    {
+        // Other thread already created the object before
+        if (const auto monoClass = GetClass())
+        {
+            // Reset managed to unmanaged pointer
+            const MField* monoUnmanagedPtrField = monoClass->GetField(ScriptingObject_unmanagedPtr);
+            if (monoUnmanagedPtrField)
+            {
+                void* param = nullptr;
+                monoUnmanagedPtrField->SetValue(managedInstance, &param);
+            }
+        }
+        mono_gchandle_free(handle);
+        return true;
+    }
+#endif
+
+    // Ensure to be registered
+    if (!IsRegistered())
+        RegisterObject();
+
+    return false;
 }
 
 #if USE_MONO
@@ -233,8 +276,16 @@ MonoObject* ScriptingObject::CreateManagedInternal()
         return nullptr;
     }
 
+    // Ensure to have managed domain attached (this can be called from custom native thread, eg. content loader)
+    auto domain = mono_domain_get();
+    if (!domain)
+    {
+        MCore::AttachThread();
+        domain = mono_domain_get();
+    }
+
     // Allocate managed instance
-    MonoObject* managedInstance = mono_object_new(mono_domain_get(), monoClass->GetNative());
+    MonoObject* managedInstance = mono_object_new(domain, monoClass->GetNative());
     if (managedInstance == nullptr)
     {
         LOG(Warning, "Failed to create new instance of the object of type {0}", String(monoClass->GetFullName()));
@@ -358,7 +409,7 @@ void ScriptingObject::OnDeleteObject()
         UnregisterObject();
 
     // Base
-    RemovableObject::OnDeleteObject();
+    Object::OnDeleteObject();
 }
 
 String ScriptingObject::ToString() const
@@ -371,6 +422,24 @@ ManagedScriptingObject::ManagedScriptingObject(const SpawnParams& params)
 {
 }
 
+void ManagedScriptingObject::OnManagedInstanceDeleted()
+{
+    // Base
+    ScriptingObject::OnManagedInstanceDeleted();
+
+    // Self destruct
+    DeleteObject();
+}
+
+void ManagedScriptingObject::OnScriptingDispose()
+{
+    // Base
+    ScriptingObject::OnScriptingDispose();
+
+    // Self destruct
+    DeleteObject();
+}
+
 bool ManagedScriptingObject::CreateManaged()
 {
 #if USE_MONO
@@ -411,70 +480,6 @@ PersistentScriptingObject::PersistentScriptingObject(const SpawnParams& params)
 {
 }
 
-PersistentScriptingObject::~PersistentScriptingObject()
-{
-    PersistentScriptingObject::DestroyManaged();
-}
-
-void PersistentScriptingObject::OnManagedInstanceDeleted()
-{
-    // Cleanup
-    if (_gcHandle)
-    {
-#if USE_MONO
-        mono_gchandle_free(_gcHandle);
-#endif
-        _gcHandle = 0;
-    }
-
-    // But do not delete itself
-}
-
-void PersistentScriptingObject::OnScriptingDispose()
-{
-    // Delete C# object
-    if (IsRegistered())
-        UnregisterObject();
-    DestroyManaged();
-
-    // Don't delete C++ object
-}
-
-bool PersistentScriptingObject::CreateManaged()
-{
-#if USE_MONO
-    MonoObject* managedInstance = CreateManagedInternal();
-    if (!managedInstance)
-        return true;
-
-    // Prevent form object GC destruction
-    auto handle = mono_gchandle_new(managedInstance, false);
-    auto oldHandle = Platform::InterlockedCompareExchange((int32*)&_gcHandle, *(int32*)&handle, 0);
-    if (*(uint32*)&oldHandle != 0)
-    {
-        // Other thread already created the object before
-        if (const auto monoClass = GetClass())
-        {
-            // Reset managed to unmanaged pointer
-            const MField* monoUnmanagedPtrField = monoClass->GetField(ScriptingObject_unmanagedPtr);
-            if (monoUnmanagedPtrField)
-            {
-                void* param = nullptr;
-                monoUnmanagedPtrField->SetValue(managedInstance, &param);
-            }
-        }
-        mono_gchandle_free(handle);
-        return true;
-    }
-#endif
-
-    // Ensure to be registered
-    if (!IsRegistered())
-        RegisterObject();
-
-    return false;
-}
-
 class ScriptingObjectInternal
 {
 public:
@@ -746,7 +751,7 @@ public:
 
     static ScriptingObject* Spawn(const ScriptingObjectSpawnParams& params)
     {
-        return New<PersistentScriptingObject>(params);
+        return New<ScriptingObject>(params);
     }
 };
 

Source/Engine/Scripting/ScriptingObject.h

@@ -8,9 +8,9 @@
 #include "ManagedCLR/MTypes.h"
 
 /// <summary>
-/// Represents object from unmanaged memory that can use accessed via C# scripting.
+/// Represents object from unmanaged memory that can use accessed via scripting.
 /// </summary>
-API_CLASS(InBuild) class FLAXENGINE_API ScriptingObject : public RemovableObject
+API_CLASS(InBuild) class FLAXENGINE_API ScriptingObject : public Object
 {
     friend class Scripting;
     friend class BinaryModule;
@@ -40,14 +40,23 @@ public:
 
 public:
 
-    /// <summary>
+    // Spawns a new objects of the given type.
-    /// Spawns a new objects of the given type.
+    static ScriptingObject* NewObject(const ScriptingTypeHandle& typeHandle);
-    /// </summary>
     template<typename T>
-    static T* Spawn()
+    static T* NewObject()
     {
-        const SpawnParams params(Guid::New(), T::TypeInitializer);
+        return (T*)NewObject(T::TypeInitializer);
-        return T::New(params);
+    }
+    template<typename T>
+    static T* NewObject(const ScriptingTypeHandle& typeHandle)
+    {
+        auto obj = NewObject(typeHandle);
+        if (obj && !obj->Is<T>())
+        {
+            Delete(obj);
+            obj = nullptr;
+        }
+        return (T*)obj;
     }
 
 public:
@@ -182,7 +191,7 @@ public:
     virtual void OnManagedInstanceDeleted();
     virtual void OnScriptingDispose();
 
-    virtual bool CreateManaged() = 0;
+    virtual bool CreateManaged();
     virtual void DestroyManaged();
 
 public:
@@ -216,7 +225,7 @@ protected:
 
 public:
 
-    // [RemovableObject]
+    // [Object]
     void OnDeleteObject() override;
     String ToString() const override;
 };
@@ -239,32 +248,17 @@ public:
 public:
 
     // [ScriptingObject]
-    bool CreateManaged() override;
-};
-
-/// <summary>
-/// Managed object that uses pinned GC handle to prevent collecting and moving. 
-/// Used by the objects that lifetime is controlled by the C++ side.
-/// </summary>
-API_CLASS(InBuild) class FLAXENGINE_API PersistentScriptingObject : public ScriptingObject
-{
-public:
-
-    /// <summary>
-    /// Initializes a new instance of the <see cref="PersistentScriptingObject"/> class.
-    /// </summary>
-    /// <param name="params">The object initialization parameters.</param>
-    explicit PersistentScriptingObject(const SpawnParams& params);
-
-    /// <summary>
-    /// Finalizes an instance of the <see cref="PersistentScriptingObject"/> class.
-    /// </summary>
-    ~PersistentScriptingObject();
-
-public:
-
-    // [ManagedScriptingObject]
     void OnManagedInstanceDeleted() override;
     void OnScriptingDispose() override;
     bool CreateManaged() override;
 };
+
+/// <summary>
+/// Use ScriptingObject instead.
+/// [Deprecated on 5.01.2022, expires on 5.01.2024]
+/// </summary>
+API_CLASS(InBuild) class FLAXENGINE_API PersistentScriptingObject : public ScriptingObject
+{
+public:
+    PersistentScriptingObject(const SpawnParams& params);
+};

Source/Engine/Serialization/JsonSerializer.cs

@@ -15,10 +15,7 @@ using Newtonsoft.Json.Serialization;
 
 namespace FlaxEngine.Json
 {
-    /// <summary>
+    partial class JsonSerializer
-    /// Objects serialization tool (json format).
-    /// </summary>
-    public static class JsonSerializer
     {
         internal class SerializerCache
         {

Source/Engine/Serialization/JsonSerializer.h

@@ -0,0 +1,41 @@
+// Copyright (c) 2012-2021 Wojciech Figat. All rights reserved.
+
+#pragma once
+
+#include "Engine/Core/ISerializable.h"
+#include "Engine/Core/Types/Span.h"
+#include "Engine/Core/Collections/Array.h"
+
+/// <summary>
+/// Objects serialization tool (json format).
+/// </summary>
+API_CLASS(Static, Namespace="FlaxEngine.Json") class FLAXENGINE_API JsonSerializer
+{
+    DECLARE_SCRIPTING_TYPE_MINIMAL(JsonSerializer);
+
+    /// <summary>
+    /// Performs object Json serialization to the raw bytes.
+    /// </summary>
+    /// <param name="obj">The object to serialize (can be null).</param>
+    /// <returns>The output data.</returns>
+    API_FUNCTION() static Array<byte> SaveToBytes(ISerializable* obj);
+
+    /// <summary>
+    /// Performs object Json deserialization from the raw bytes.
+    /// </summary>
+    /// <param name="obj">The object to deserialize (can be null).</param>
+    /// <param name="data">The source data to read from.</param>
+    /// <param name="engineBuild">The engine build number of the saved data. Used to resolve old object formats when loading deprecated data.</param>
+    FORCE_INLINE static void LoadFromBytes(ISerializable* obj, const Array<byte>& data, int32 engineBuild)
+    {
+        LoadFromBytes(obj, Span<byte>(data.Get(), data.Count()), engineBuild);
+    }
+
+    /// <summary>
+    /// Performs object Json deserialization from the raw bytes.
+    /// </summary>
+    /// <param name="obj">The object to deserialize (can be null).</param>
+    /// <param name="data">The source data to read from.</param>
+    /// <param name="engineBuild">The engine build number of the saved data. Used to resolve old object formats when loading deprecated data.</param>
+    API_FUNCTION() static void LoadFromBytes(ISerializable* obj, const Span<byte>& data, int32 engineBuild);
+};

Source/Engine/Serialization/MemoryReadStream.h

@@ -3,6 +3,7 @@
 #pragma once
 
 #include "ReadStream.h"
+#include "Engine/Platform/Platform.h"
 
 /// <summary>
 /// Super fast advanced data reading from raw bytes without any overhead at all
@@ -33,8 +34,8 @@ public:
     /// Init
     /// </summary>
     /// <param name="data">Array with data to read from</param>
-    template<typename T>
+    template<typename T, typename AllocationType = HeapAllocation>
-    MemoryReadStream(const Array<T>& data)
+    MemoryReadStream(const Array<T, AllocationType>& data)
         : MemoryReadStream(data.Get(), data.Count() * sizeof(T))
     {
     }
@@ -52,8 +53,8 @@ public:
     /// Init stream to the custom buffer location
     /// </summary>
     /// <param name="data">Array with data to read from</param>
-    template<typename T>
+    template<typename T, typename AllocationType = HeapAllocation>
-    FORCE_INLINE void Init(const Array<T>& data)
+    FORCE_INLINE void Init(const Array<T, AllocationType>& data)
     {
         Init(data.Get(), data.Count() * sizeof(T));
     }

Source/Engine/Serialization/ReadStream.h

@@ -2,27 +2,19 @@
 
 #pragma once
 
-#include "Engine/Core/Collections/Array.h"
 #include "Stream.h"
+#include "Engine/Core/Templates.h"
 
 struct CommonValue;
 struct Variant;
 struct VariantType;
+class ISerializable;
 
 /// <summary>
 /// Base class for all data read streams
 /// </summary>
 class FLAXENGINE_API ReadStream : public Stream
 {
-public:
-
-    /// <summary>
-    /// Virtual destructor
-    /// </summary>
-    virtual ~ReadStream()
-    {
-    }
-
 public:
 
     /// <summary>
@@ -32,8 +24,6 @@ public:
     /// <param name="bytes">Amount of bytes to read</param>
     virtual void ReadBytes(void* data, uint32 bytes) = 0;
 
-public:
-
     template<typename T>
     FORCE_INLINE void Read(T* data)
     {
@@ -193,9 +183,10 @@ public:
     /// Read data array
     /// </summary>
     /// <param name="data">Array to read</param>
-    template<typename T>
+    template<typename T, typename AllocationType = HeapAllocation>
-    void ReadArray(Array<T>* data)
+    void ReadArray(Array<T, AllocationType>* data)
     {
+        static_assert(TIsPODType<T>::Value, "Only POD types are valid for ReadArray.");
         int32 size;
         ReadInt32(&size);
         data->Resize(size, false);
@@ -203,6 +194,13 @@ public:
             ReadBytes(data->Get(), size * sizeof(T));
     }
 
+    /// <summary>
+    /// Deserializes object from Json by reading it as a raw data (ver+length+bytes).
+    /// </summary>
+    /// <remarks>Reads version number, data length and actual data bytes from the stream.</remarks>
+    /// <param name="obj">The object to deserialize.</param>
+    void ReadJson(ISerializable* obj);
+
 public:
 
     // [Stream]

Source/Engine/Serialization/Stream.cpp

@@ -3,11 +3,16 @@
 #include "ReadStream.h"
 #include "WriteStream.h"
 #include "JsonWriters.h"
+#include "JsonSerializer.h"
+#include "MemoryReadStream.h"
 #include "Engine/Core/Types/CommonValue.h"
 #include "Engine/Core/Types/Variant.h"
 #include "Engine/Core/Collections/Dictionary.h"
 #include "Engine/Content/Asset.h"
+#include "Engine/Core/Cache.h"
 #include "Engine/Debug/DebugLog.h"
+#include "Engine/Debug/Exceptions/JsonParseException.h"
+#include "Engine/Profiler/ProfilerCPU.h"
 #include "Engine/Scripting/ManagedSerialization.h"
 #include "Engine/Scripting/Scripting.h"
 #include "Engine/Scripting/ScriptingObject.h"
@@ -489,12 +494,41 @@ void ReadStream::ReadVariant(Variant* data)
     }
 }
 
+void ReadStream::ReadJson(ISerializable* obj)
+{
+    int32 engineBuild, size;
+    ReadInt32(&engineBuild);
+    ReadInt32(&size);
+    if (obj)
+    {
+        if (const auto memoryStream = dynamic_cast<MemoryReadStream*>(this))
+        {
+            JsonSerializer::LoadFromBytes(obj, Span<byte>((byte*)memoryStream->Read(size), size), engineBuild);
+        }
+        else
+        {
+            void* data = Allocator::Allocate(size);
+            ReadBytes(data, size);
+            JsonSerializer::LoadFromBytes(obj, Span<byte>((byte*)data, size), engineBuild);
+            Allocator::Free(data);
+        }
+    }
+    else
+        SetPosition(GetPosition() + size);
+}
+
 void WriteStream::WriteText(const StringView& text)
 {
     for (int32 i = 0; i < text.Length(); i++)
         WriteChar(text[i]);
 }
 
+void WriteStream::WriteText(const StringAnsiView& text)
+{
+    for (int32 i = 0; i < text.Length(); i++)
+        WriteChar(text[i]);
+}
+
 void WriteStream::WriteString(const StringView& data)
 {
     const int32 length = data.Length();
@@ -519,7 +553,7 @@ void WriteStream::WriteStringAnsi(const StringAnsiView& data)
     Write(data.Get(), length);
 }
 
-void WriteStream::WriteStringAnsi(const StringAnsiView& data, int16 lock)
+void WriteStream::WriteStringAnsi(const StringAnsiView& data, int8 lock)
 {
     const int32 length = data.Length();
     ASSERT(length < STREAM_MAX_STRING_LENGTH);
@@ -734,3 +768,57 @@ void WriteStream::WriteVariant(const Variant& data)
     CRASH;
     }
 }
+
+void WriteStream::WriteJson(ISerializable* obj, const void* otherObj)
+{
+    WriteInt32(FLAXENGINE_VERSION_BUILD);
+    if (obj)
+    {
+        rapidjson_flax::StringBuffer buffer;
+        CompactJsonWriter writer(buffer);
+        writer.StartObject();
+        obj->Serialize(writer, otherObj);
+        writer.EndObject();
+
+        WriteInt32((int32)buffer.GetSize());
+        WriteBytes((byte*)buffer.GetString(), (int32)buffer.GetSize());
+    }
+    else
+        WriteInt32(0);
+}
+
+Array<byte> JsonSerializer::SaveToBytes(ISerializable* obj)
+{
+    Array<byte> result;
+    if (obj)
+    {
+        rapidjson_flax::StringBuffer buffer;
+        CompactJsonWriter writer(buffer);
+        writer.StartObject();
+        obj->Serialize(writer, nullptr);
+        writer.EndObject();
+        result.Set((byte*)buffer.GetString(), (int32)buffer.GetSize());
+    }
+    return result;
+}
+
+void JsonSerializer::LoadFromBytes(ISerializable* obj, const Span<byte>& data, int32 engineBuild)
+{
+    if (!obj || data.Length() == 0)
+        return;
+
+    ISerializable::SerializeDocument document;
+    {
+        PROFILE_CPU_NAMED("Json.Parse");
+        document.Parse((const char*)data.Get(), data.Length());
+    }
+    if (document.HasParseError())
+    {
+        Log::JsonParseException(document.GetParseError(), document.GetErrorOffset());
+        return;
+    }
+
+    auto modifier = Cache::ISerializeModifier.Get();
+    modifier->EngineBuild = engineBuild;
+    obj->Deserialize(document, modifier.Value);
+}

Source/Engine/Serialization/Stream.h

@@ -2,6 +2,7 @@
 
 #pragma once
 
+#include "Engine/Core/Core.h"
 #include "Engine/Core/Types/BaseTypes.h"
 
 #define FILESTREAM_BUFFER_SIZE 4096

Source/Engine/Serialization/WriteStream.h

@@ -2,28 +2,19 @@
 
 #pragma once
 
-#include "Engine/Core/Collections/Array.h"
-#include "Engine/Core/Formatting.h"
 #include "Stream.h"
+#include "Engine/Core/Templates.h"
 
 struct CommonValue;
 struct Variant;
 struct VariantType;
+class ISerializable;
 
 /// <summary>
 /// Base class for all data write streams
 /// </summary>
 class FLAXENGINE_API WriteStream : public Stream
 {
-public:
-
-    /// <summary>
-    /// Virtual destructor
-    /// </summary>
-    virtual ~WriteStream()
-    {
-    }
-
 public:
 
     /// <summary>
@@ -33,8 +24,6 @@ public:
     /// <param name="bytes">Amount of bytes to write</param>
     virtual void WriteBytes(const void* data, uint32 bytes) = 0;
 
-public:
-
     template<typename T>
     FORCE_INLINE void Write(const T* data)
     {
@@ -165,24 +154,6 @@ public:
         WriteBytes((const void*)text, sizeof(Char) * length);
     }
 
-    template<typename... Args>
-    void WriteTextFormatted(const char* format, const Args& ... args)
-    {
-        fmt_flax::allocator_ansi allocator;
-        fmt_flax::memory_buffer_ansi buffer(allocator);
-        fmt_flax::format(buffer, format, args...);
-        WriteText(buffer.data(), (int32)buffer.size());
-    }
-
-    template<typename... Args>
-    void WriteTextFormatted(const Char* format, const Args& ... args)
-    {
-        fmt_flax::allocator allocator;
-        fmt_flax::memory_buffer buffer(allocator);
-        fmt_flax::format(buffer, format, args...);
-        WriteText(buffer.data(), (int32)buffer.size());
-    }
-
     // Write UTF BOM character sequence
     void WriteBOM()
     {
@@ -194,6 +165,7 @@ public:
     // Writes text to the stream
     // @param data Text to write
     void WriteText(const StringView& text);
+    void WriteText(const StringAnsiView& text);
 
     // Writes String to the stream
     // @param data Data to write
@@ -211,7 +183,7 @@ public:
     // Writes Ansi String to the stream
     // @param data Data to write
     // @param lock Characters pass in the stream
-    void WriteStringAnsi(const StringAnsiView& data, int16 lock);
+    void WriteStringAnsi(const StringAnsiView& data, int8 lock);
 
 public:
 
@@ -231,8 +203,8 @@ public:
     /// Write data array
     /// </summary>
     /// <param name="data">Array to write</param>
-    template<typename T>
+    template<typename T, typename AllocationType = HeapAllocation>
-    void WriteArray(const Array<T>& data)
+    void WriteArray(const Array<T, AllocationType>& data)
     {
         static_assert(TIsPODType<T>::Value, "Only POD types are valid for WriteArray.");
         const int32 size = data.Count();
@@ -241,6 +213,14 @@ public:
             WriteBytes(data.Get(), size * sizeof(T));
     }
 
+    /// <summary>
+    /// Serializes object to Json and writes it as a raw data (ver+length+bytes).
+    /// </summary>
+    /// <remarks>Writes version number, data length and actual data bytes to the stream.</remarks>
+    /// <param name="obj">The object to serialize.</param>
+    /// <param name="otherObj">The instance of the object to compare with and serialize only the modified properties. If null, then serialize all properties.</param>
+    void WriteJson(ISerializable* obj, const void* otherObj = nullptr);
+
 public:
 
     // [Stream]

Source/Engine/Threading/Task.h

@@ -18,7 +18,7 @@ DECLARE_ENUM_EX_6(TaskState, int64, 0, Created, Failed, Canceled, Queued, Runnin
 /// <summary>
 /// Represents an asynchronous operation.
 /// </summary>
-class FLAXENGINE_API Task : public RemovableObject, public NonCopyable
+class FLAXENGINE_API Task : public Object, public NonCopyable
 {
     //
     // Tasks execution and states flow:

Source/Engine/Threading/TaskGraph.cpp

@@ -14,7 +14,7 @@ namespace
 }
 
 TaskGraphSystem::TaskGraphSystem(const SpawnParams& params)
-    : PersistentScriptingObject(params)
+    : ScriptingObject(params)
 {
 }
 
@@ -36,7 +36,7 @@ void TaskGraphSystem::PostExecute(TaskGraph* graph)
 }
 
 TaskGraph::TaskGraph(const SpawnParams& params)
-    : PersistentScriptingObject(params)
+    : ScriptingObject(params)
 {
 }
 

Source/Engine/Threading/TaskGraph.h

@@ -10,7 +10,7 @@ class TaskGraph;
 /// <summary>
 /// System that can generate work into Task Graph for asynchronous execution.
 /// </summary>
-API_CLASS(Abstract) class FLAXENGINE_API TaskGraphSystem : public PersistentScriptingObject
+API_CLASS(Abstract) class FLAXENGINE_API TaskGraphSystem : public ScriptingObject
 {
 DECLARE_SCRIPTING_TYPE(TaskGraphSystem);
     friend TaskGraph;
@@ -52,7 +52,7 @@ public:
 /// <summary>
 /// Graph-based asynchronous tasks scheduler for high-performance computing and processing.
 /// </summary>
-API_CLASS() class FLAXENGINE_API TaskGraph : public PersistentScriptingObject
+API_CLASS() class FLAXENGINE_API TaskGraph : public ScriptingObject
 {
 DECLARE_SCRIPTING_TYPE(TaskGraph);
 private:

Source/Engine/Tools/ModelTool/ModelTool.OpenFBX.cpp

@@ -720,9 +720,9 @@ bool ProcessMesh(ImportedModelData& result, OpenFbxImporterData& data, const ofb
                 continue;
             const ofbx::Shape* shape = channel->getShape(targetShapeCount - 1);
 
-            if (shape->getVertexCount() != vertexCount)
+            if (shape->getVertexCount() != aGeometry->getVertexCount())
             {
-                LOG(Error, "Blend shape '{0}' in mesh '{1}' has different amount of vertices ({2}) than mesh ({3})", String(shape->name), mesh.Name, shape->getVertexCount(), vertexCount);
+                LOG(Error, "Blend shape '{0}' in mesh '{1}' has different amount of vertices ({2}) than mesh ({3})", String(shape->name), mesh.Name, shape->getVertexCount(), aGeometry->getVertexCount());
                 continue;
             }
 
@@ -730,21 +730,21 @@ bool ProcessMesh(ImportedModelData& result, OpenFbxImporterData& data, const ofb
             blendShapeData.Name = shape->name;
             blendShapeData.Weight = channel->getShapeCount() > 1 ? (float)(channel->getDeformPercent() / 100.0) : 1.0f;
 
-            blendShapeData.Vertices.Resize(shape->getVertexCount());
+            blendShapeData.Vertices.Resize(vertexCount);
             for (int32 i = 0; i < blendShapeData.Vertices.Count(); i++)
                 blendShapeData.Vertices.Get()[i].VertexIndex = i;
 
             auto shapeVertices = shape->getVertices();
             for (int32 i = 0; i < blendShapeData.Vertices.Count(); i++)
             {
-                auto delta = ToVector3(shapeVertices[i]) - mesh.Positions.Get()[i];
+                auto delta = ToVector3(shapeVertices[i + firstVertexOffset]) - mesh.Positions.Get()[i];
                 blendShapeData.Vertices.Get()[i].PositionDelta = delta;
             }
 
             auto shapeNormals = shape->getNormals();
             for (int32 i = 0; i < blendShapeData.Vertices.Count(); i++)
             {
-                /*auto delta = ToVector3(shapeNormals[i]) - mesh.Normals[i];
+                /*auto delta = ToVector3(shapeNormals[i + firstVertexOffset]) - mesh.Normals[i];
                 auto length = delta.Length();
                 if (length > ZeroTolerance)
                     delta /= length;*/

Source/Engine/Utilities/Utils.cs

@@ -357,6 +357,26 @@ namespace FlaxEngine
             return new Matrix(stream.ReadSingle(), stream.ReadSingle(), stream.ReadSingle(), stream.ReadSingle(), stream.ReadSingle(), stream.ReadSingle(), stream.ReadSingle(), stream.ReadSingle(), stream.ReadSingle(), stream.ReadSingle(), stream.ReadSingle(), stream.ReadSingle(), stream.ReadSingle(), stream.ReadSingle(), stream.ReadSingle(), stream.ReadSingle());
         }
 
+        /// <summary>
+        /// Deserializes object from Json by reading it as a raw data (ver+length+bytes).
+        /// </summary>
+        /// <remarks>Reads version number, data length and actual data bytes from the stream.</remarks>
+        /// <param name="stream">The stream.</param>
+        /// <param name="obj">The object to deserialize.</param>
+        public static void ReadJson(this BinaryReader stream, ISerializable obj)
+        {
+            // ReadStream::ReadJson
+            var engineBuild = stream.ReadInt32();
+            var size = stream.ReadInt32();
+            if (obj != null)
+            {
+                var data = stream.ReadBytes(size);
+                Json.JsonSerializer.LoadFromBytes(obj, data, engineBuild);
+            }
+            else
+                stream.BaseStream.Seek(size, SeekOrigin.Current);
+        }
+
         /// <summary>
         /// Writes the color to the binary stream.
         /// </summary>
@@ -548,5 +568,25 @@ namespace FlaxEngine
             stream.Write(value.M43);
             stream.Write(value.M44);
         }
+
+        /// <summary>
+        /// Serializes object to Json and writes it as a raw data (ver+length+bytes).
+        /// </summary>
+        /// <param name="stream">The stream.</param>
+        /// <remarks>Writes version number, data length and actual data bytes to the stream.</remarks>
+        /// <param name="obj">The object to serialize.</param>
+        public static void WriteJson(this BinaryWriter stream, ISerializable obj)
+        {
+            // WriteStream::WriteJson
+            stream.Write(Globals.EngineBuildNumber);
+            if (obj != null)
+            {
+                var bytes = Json.JsonSerializer.SaveToBytes(obj);
+                stream.Write(bytes.Length);
+                stream.Write(bytes);
+            }
+            else
+                stream.Write(0);
+        }
     }
 }

Source/Engine/Visject/GraphParameter.h

@@ -39,9 +39,9 @@ API_ENUM() enum class ChannelMask
 /// <summary>
 /// Represents a parameter in the Graph.
 /// </summary>
-API_CLASS() class FLAXENGINE_API GraphParameter : public PersistentScriptingObject
+API_CLASS() class FLAXENGINE_API GraphParameter : public ScriptingObject
 {
-DECLARE_SCRIPTING_TYPE_WITH_CONSTRUCTOR_IMPL(GraphParameter, PersistentScriptingObject);
+DECLARE_SCRIPTING_TYPE_WITH_CONSTRUCTOR_IMPL(GraphParameter, ScriptingObject);
 public:
 
     /// <summary>