six dof drag parenting rotation fix

dist/preview release/what's new.md

@@ -35,7 +35,7 @@
 - UtilityLayer class to render another scene as a layer on top of an existing scene ([TrevorDev](https://github.com/TrevorDev))
 - AnimationGroup has now onAnimationGroupEnd observable ([RaananW](https://github.com/RaananW))
 - PointerDragBehavior, SixDofDragBehavior and MultiPointerScaleBehavior to enable smooth drag and drop/scaling with mouse or 6dof controller on a mesh ([TrevorDev](https://github.com/TrevorDev))
-- Gizmo and GizmoManager classes used to manipulate meshes in a scene. Gizmo types include position, rotation, scale, and bounding box ([TrevorDev](https://github.com/TrevorDev))
+- Gizmo and GizmoManager classes used to manipulate meshes in a scene. Gizmo types include: position, rotation, scale, and bounding box ([TrevorDev](https://github.com/TrevorDev))
 - Added a new `mesh.ignoreNonUniformScaling` to turn off non uniform scaling compensation ([Deltakosh](https://github.com/deltakosh))
 - AssetsManager tasks will only run when their state is INIT. It is now possible to remove a task from the assets manager ([RaananW](https://github.com/RaananW))
 - Added sprite isVisible field ([TrevorDev](https://github.com/TrevorDev))

src/Behaviors/Mesh/babylon.sixDofDragBehavior.ts

@@ -87,7 +87,10 @@ module BABYLON {
                         if(!pickedMesh.rotationQuaternion){
                             pickedMesh.rotationQuaternion = Quaternion.RotationYawPitchRoll(pickedMesh.rotation.y,pickedMesh.rotation.x,pickedMesh.rotation.z);
                         }
+                        var oldParent=pickedMesh.parent;
+                        pickedMesh.setParent(null);
                         this._virtualDragMesh.rotationQuaternion!.copyFrom(pickedMesh.rotationQuaternion);
+                        pickedMesh.setParent(oldParent);
                         this._virtualOriginMesh.addChild(this._virtualDragMesh);
                         
                         // Update state
@@ -154,7 +157,10 @@ module BABYLON {
                     Quaternion.RotationYawPitchRollToRef(tmpQuaternion.toEulerAngles("xyz").y,0,0, tmpQuaternion);
                     tmpQuaternion.multiplyToRef(this._startingOrientation, tmpQuaternion);
                     // Slowly move mesh to avoid jitter
+                    var oldParent=pickedMesh.parent;
+                    pickedMesh.setParent(null);
                     Quaternion.SlerpToRef(pickedMesh.rotationQuaternion!, tmpQuaternion, this.dragDeltaRatio, pickedMesh.rotationQuaternion!);
+                    pickedMesh.setParent(oldParent);
                 }
             });
         }

src/Mesh/babylon.transformNode.ts

@@ -536,7 +536,9 @@ module BABYLON {
          * Returns the TransformNode.
          */
         public setParent(node: Nullable<Node>): TransformNode {
-
+            if (node === null && this.parent === null) {
+                return this;
+            }
             if (node === null) {
                 var rotation = Tmp.Quaternion[0];
                 var position = Tmp.Vector3[0];

src/babylon.node.ts

@@ -67,7 +67,7 @@
         /** @hidden */
         public _cache: any;
 
-        private _parentNode: Nullable<Node>;
+        private _parentNode: Nullable<Node> = null;
         private _children: Node[];
 
         /**