Pipeline based rendering expects the pipeline out of date

before the rendering occurs, we then need to update the pipeline.
Actually, it should automatically done by the rendering mechanism...

Libs/Visualization/VTK/Core/vtkLightBoxRendererManager.cpp

@@ -423,6 +423,12 @@ void vtkLightBoxRendererManager::SetImageData(vtkImageData* newImageData)
 }
 
 //----------------------------------------------------------------------------
+vtkImageData* vtkLightBoxRendererManager::GetImageData()const
+{
+  return this->Internal->ImageData;
+}
+
+//----------------------------------------------------------------------------
 vtkCamera* vtkLightBoxRendererManager::GetActiveCamera()
 {
   if (this->Internal->RenderWindowItemList.size() == 0)

Libs/Visualization/VTK/Core/vtkLightBoxRendererManager.h

@@ -31,6 +31,7 @@ class CTK_VISUALIZATION_VTK_CORE_EXPORT vtkLightBoxRendererManager : public vtkO
 
   /// Set image data
   void SetImageData(vtkImageData* newImageData);
+  vtkImageData* GetImageData()const;
 
   /// Get active camera
   /// Note that the same camera is used with all the renderWindowItem

Libs/Visualization/VTK/Widgets/ctkVTKAbstractView.cpp

@@ -147,6 +147,7 @@ void ctkVTKAbstractView::forceRender()
     {
     return;
     }
+  this->preRender();
   d->RenderWindow->Render();
 }
 

Libs/Visualization/VTK/Widgets/ctkVTKAbstractView.h

@@ -54,7 +54,7 @@ public slots:
   void scheduleRender();
 
   /// Force a render even if a render is already ocurring
-  void forceRender();
+  virtual void forceRender();
 
   /// Set background color
   virtual void setBackgroundColor(const QColor& newBackgroundColor) = 0;
@@ -97,7 +97,7 @@ public:
 protected:
   QScopedPointer<ctkVTKAbstractViewPrivate> d_ptr;
   ctkVTKAbstractView(ctkVTKAbstractViewPrivate* pimpl, QWidget* parent);
-
+  virtual void preRender(){};
 private:
   Q_DECLARE_PRIVATE(ctkVTKAbstractView);
   Q_DISABLE_COPY(ctkVTKAbstractView);

Libs/Visualization/VTK/Widgets/ctkVTKSliceView.cpp

@@ -134,6 +134,19 @@ void ctkVTKSliceView::resetCamera()
 }
 
 //----------------------------------------------------------------------------
+void ctkVTKSliceView::preRender()
+{
+  Q_D(ctkVTKSliceView);
+  vtkImageData* imageData = d->LightBoxRendererManager->GetImageData();
+  if (imageData)
+    {
+    /// FIXME: Shouldn't be needed to update the pipeline here. During the
+    /// rendering, the actors should update the pipeline via the mappers.
+    imageData->Update();
+    }
+}
+
+//----------------------------------------------------------------------------
 void ctkVTKSliceView::setImageData(vtkImageData* newImageData)
 {
   Q_D(ctkVTKSliceView);

Libs/Visualization/VTK/Widgets/ctkVTKSliceView.h

@@ -129,7 +129,7 @@ signals:
 
 protected:
   virtual void resizeEvent(QResizeEvent * event);
-
+  virtual void preRender();
 private:
   Q_DECLARE_PRIVATE(ctkVTKSliceView);
   Q_DISABLE_COPY(ctkVTKSliceView);