Add automatic preserving of basic joint properties when converting between types in Editor

Source/Editor/Modules/SceneEditingModule.cs

@@ -430,6 +430,7 @@ namespace FlaxEditor.Modules
             var actorNode = Editor.Instance.Scene.GetActorNode(actor);
             if (actorNode == null)
                 throw new InvalidOperationException("Failed to create scene node for the spawned actor.");
+            actorNode.PostConvert(oldNode);
 
             actorNode.PostSpawn();
             Editor.Scene.MarkSceneEdited(actor.Scene);

Source/Editor/SceneGraph/ActorNode.cs

@@ -295,6 +295,14 @@ namespace FlaxEditor.SceneGraph
         {
         }
 
+        /// <summary>
+        /// Action called after converting actor in editor.
+        /// </summary>
+        /// <param name="source">The source actor node from which this node was converted.</param>
+        public virtual void PostConvert(ActorNode source)
+        {
+        }
+
         /// <inheritdoc />
         protected override void OnParentChanged()
         {

Source/Editor/SceneGraph/Actors/JointNode.cs

@@ -0,0 +1,35 @@
+// Copyright (c) 2012-2021 Wojciech Figat. All rights reserved.
+
+using FlaxEngine;
+
+namespace FlaxEditor.SceneGraph.Actors
+{
+    /// <summary>
+    /// Scene tree node for <see cref="Joint"/> actor type.
+    /// </summary>
+    [HideInEditor]
+    public sealed class JointNode : ActorNode
+    {
+        /// <inheritdoc />
+        public JointNode(Actor actor)
+        : base(actor)
+        {
+        }
+
+        /// <inheritdoc />
+        public override void PostConvert(ActorNode source)
+        {
+            base.PostConvert(source);
+
+            if (source.Actor is Joint other)
+            {
+                // Preserve basic properties when changing joint type
+                var joint = (Joint)Actor;
+                joint.Target = other.Target;
+                joint.TargetAnchor = other.TargetAnchor;
+                joint.TargetAnchorRotation = other.TargetAnchorRotation;
+                joint.EnableCollision = other.EnableCollision;
+            }
+        }
+    }
+}

Source/Editor/SceneGraph/SceneGraphFactory.cs

@@ -72,6 +72,7 @@ namespace FlaxEditor.SceneGraph
             CustomNodesTypes.Add(typeof(SplineRopeBody), typeof(ActorNode));
             CustomNodesTypes.Add(typeof(NavMesh), typeof(ActorNode));
             CustomNodesTypes.Add(typeof(SpriteRender), typeof(SpriteRenderNode));
+            CustomNodesTypes.Add(typeof(Joint), typeof(JointNode));
         }
 
         /// <summary>