Gui: Improve object center rotation mode

src/Gui/NavigationStyle.cpp

@@ -1082,8 +1082,9 @@ void NavigationStyle::saveCursorPosition(const SoEvent * const ev)
         if (!cam) // no camera
             return;
 
+        // Get the bounding box center of the physical object group
         SoGetBoundingBoxAction action(viewer->getSoRenderManager()->getViewportRegion());
-        action.apply(viewer->getSceneGraph());
+        action.apply(viewer->objectGroup);
         SbBox3f boundingBox = action.getBoundingBox();
         SbVec3f boundingBoxCenter = boundingBox.getCenter();
         setRotationCenter(boundingBoxCenter);

src/Gui/View3DInventorViewer.cpp

@@ -335,6 +335,7 @@ View3DInventorViewer::View3DInventorViewer(QWidget* parent, const QtGLWidget* sh
     : Quarter::SoQTQuarterAdaptor(parent, sharewidget)
     , SelectionObserver(false, ResolveMode::NoResolve)
     , editViewProvider(nullptr)
+    , objectGroup(nullptr)
     , navigation(nullptr)
     , renderType(Native)
     , framebuffer(nullptr)
@@ -354,6 +355,7 @@ View3DInventorViewer::View3DInventorViewer(const QtGLFormat& format, QWidget* pa
     : Quarter::SoQTQuarterAdaptor(format, parent, sharewidget)
     , SelectionObserver(false, ResolveMode::NoResolve)
     , editViewProvider(nullptr)
+    , objectGroup(nullptr)
     , navigation(nullptr)
     , renderType(Native)
     , framebuffer(nullptr)
@@ -482,6 +484,11 @@ void View3DInventorViewer::init()
     pcEditingRoot->addChild(pcEditingTransform);
     pcViewProviderRoot->addChild(pcEditingRoot);
 
+    // Create group for the physical object
+    objectGroup = new SoGroup();
+    objectGroup->ref();
+    pcViewProviderRoot->addChild(objectGroup);
+
     // Set our own render action which show a bounding box if
     // the SoFCSelection::BOX style is set
     //
@@ -569,6 +576,8 @@ View3DInventorViewer::~View3DInventorViewer()
     coinRemoveAllChildren(this->pcViewProviderRoot);
     this->pcViewProviderRoot->unref();
     this->pcViewProviderRoot = nullptr;
+    this->objectGroup->unref();
+    this->objectGroup = nullptr;
     this->backlight->unref();
     this->backlight = nullptr;
 
@@ -759,8 +768,15 @@ void View3DInventorViewer::addViewProvider(ViewProvider* pcProvider)
     SoSeparator* root = pcProvider->getRoot();
 
     if (root) {
-        if(pcProvider->canAddToSceneGraph())
-            pcViewProviderRoot->addChild(root);
+        if (pcProvider->canAddToSceneGraph()) {
+            // Add to the physical object group if related to the physical object otherwise add to the scene graph
+            if (pcProvider->isPartOfPhysicalObject()) {
+                objectGroup->addChild(root);
+            }
+            else {
+                pcViewProviderRoot->addChild(root);
+            }
+        }
         _ViewProviderMap[root] = pcProvider;
     }
 
@@ -784,9 +800,15 @@ void View3DInventorViewer::removeViewProvider(ViewProvider* pcProvider)
     SoSeparator* root = pcProvider->getRoot();
 
     if (root) {
-        int index = pcViewProviderRoot->findChild(root);
-        if(index>=0)
+        int index = objectGroup->findChild(root);
+        if (index >= 0) {
+            objectGroup->removeChild(index);
+        }
+
+        index = pcViewProviderRoot->findChild(root);
+        if (index >= 0) {
             pcViewProviderRoot->removeChild(index);
+        }
         _ViewProviderMap.erase(root);
     }
 

src/Gui/View3DInventorViewer.h

@@ -485,7 +485,10 @@ private:
     SoSeparator * foregroundroot;
     SoDirectionalLight* backlight;
 
+    // Scene graph root
     SoSeparator * pcViewProviderRoot;
+    // Child group in the scene graph that contains view providers related to the physical object
+    SoGroup* objectGroup;
 
     std::unique_ptr<View3DInventorSelection> inventorSelection;
 

src/Gui/ViewProvider.h

@@ -142,6 +142,8 @@ public:
     virtual SoSeparator* getBackRoot() const;
     ///Indicate whether to be added to scene graph or not
     virtual bool canAddToSceneGraph() const {return true;}
+    // Indicate whether to be added to object group (true) or only to scene graph (false)
+    virtual bool isPartOfPhysicalObject() const {return true;}
 
     /** deliver the children belonging to this object
       * this method is used to deliver the objects to

src/Gui/ViewProviderMeasureDistance.cpp

@@ -120,6 +120,11 @@ ViewProviderMeasureDistance::~ViewProviderMeasureDistance()
     pLines->unref();
 }
 
+bool ViewProviderMeasureDistance::isPartOfPhysicalObject() const
+{
+    return false;
+}
+
 void ViewProviderMeasureDistance::onChanged(const App::Property* prop)
 {
     if (prop == &Mirror || prop == &DistFactor) {
@@ -313,6 +318,11 @@ ViewProviderPointMarker::~ViewProviderPointMarker()
     pMarker->unref();
 }
 
+bool ViewProviderPointMarker::isPartOfPhysicalObject() const
+{
+    return false;
+}
+
 void ViewProviderMeasureDistance::measureDistanceCallback(void * ud, SoEventCallback * n)
 {
     auto view  = static_cast<Gui::View3DInventorViewer*>(n->getUserData());

src/Gui/ViewProviderMeasureDistance.h

@@ -66,6 +66,7 @@ class GuiExport ViewProviderPointMarker : public ViewProviderDocumentObject
 public:
     ViewProviderPointMarker();
     ~ViewProviderPointMarker() override;
+    bool isPartOfPhysicalObject() const override;
 
 protected:
     SoCoordinate3    * pCoords;
@@ -81,6 +82,7 @@ public:
     /// Constructor
     ViewProviderMeasureDistance();
     ~ViewProviderMeasureDistance() override;
+    bool isPartOfPhysicalObject() const override;
 
     // Display properties
     App::PropertyColor          TextColor;