diff --git a/src/Vtk/HEP/Detectors/testing/vtkDetectorChamberTest.cpp b/src/Vtk/HEP/Detectors/testing/vtkDetectorChamberTest.cpp
index 2f126a7..cb5da5c 100644
--- a/src/Vtk/HEP/Detectors/testing/vtkDetectorChamberTest.cpp
+++ b/src/Vtk/HEP/Detectors/testing/vtkDetectorChamberTest.cpp
@@ -40,7 +40,6 @@ BOOST_AUTO_TEST_CASE(vtkDetectorChamberTest) {
   d2.SetPosition(uLib::Vector3f(0, 0, 20));
 
   uLib::Vtk::vtkDetectorChamber vtkDetectorChamber(&d1);
-
   uLib::Vtk::vtkDetectorChamber vtkDetectorChamber2(&d2);
 
   if (!vtkDetectorChamber.GetProp()) {
diff --git a/src/Vtk/testing/vtkContainerBoxTest.cpp b/src/Vtk/testing/vtkContainerBoxTest.cpp
index 7c477ef..5b99c5e 100644
--- a/src/Vtk/testing/vtkContainerBoxTest.cpp
+++ b/src/Vtk/testing/vtkContainerBoxTest.cpp
@@ -23,8 +23,6 @@
 
 //////////////////////////////////////////////////////////////////////////////*/
 
-
-
 #include "Vtk/uLibVtkViewer.h"
 
 #include "Math/ContainerBox.h"
@@ -35,19 +33,18 @@
 using namespace uLib;
 
 int main() {
-    BEGIN_TESTING(vtk ContainerBox Test);
+  BEGIN_TESTING(vtk ContainerBox Test);
 
+  ContainerBox box;
+  box.SetSize(Vector3f(2, 3, 4));
+  box.SetPosition(Vector3f(1, 2, 3));
+  Vtk::vtkContainerBox v_box(&box);
+
+  if (std::getenv("CTEST_PROJECT_NAME") == nullptr) {
     Vtk::Viewer v_viewer;
-
-    ContainerBox box;
-    box.SetSize(Vector3f(2,3,4));
-    box.SetPosition(Vector3f(1,2,3));
-
-    Vtk::vtkContainerBox v_box(box);
-
     v_viewer.AddPuppet(v_box);
     v_viewer.Start();
+  }
 
-
-    END_TESTING;
+  END_TESTING;
 }
diff --git a/src/Vtk/uLibVtkViewer.cpp b/src/Vtk/uLibVtkViewer.cpp
index d089cd0..847da36 100644
--- a/src/Vtk/uLibVtkViewer.cpp
+++ b/src/Vtk/uLibVtkViewer.cpp
@@ -33,6 +33,7 @@
 
 #include <vtkAxesActor.h>
 #include <vtkCamera.h>
+#include <vtkCameraOrientationWidget.h>
 #include <vtkInteractorStyleTrackballCamera.h>
 #include <vtkObjectFactory.h>
 #include <vtkTextProperty.h>
@@ -61,11 +62,14 @@ namespace Vtk {
 ////////////////////////////////////////////////////////////////////////////////
 ///// VTK VIEWER  //////////////////////////////////////////////////////////////
 ////////////////////////////////////////////////////////////////////////////////
-
 Viewer::Viewer()
     : m_RenderWindow(vtkRenderWindow::New()), m_Renderer(vtkRenderer::New()),
       m_Annotation(vtkCornerAnnotation::New()),
-      m_Marker(vtkOrientationMarkerWidget::New()) {
+      m_Marker(vtkOrientationMarkerWidget::New()), m_CameraWidget(nullptr) {
+#if VTK_MAJOR_VERSION >= 9 ||                                                  \
+    (VTK_MAJOR_VERSION == 8 && VTK_MINOR_VERSION >= 90)
+  m_CameraWidget = vtkCameraOrientationWidget::New();
+#endif
   InstallPipe();
 }
 
@@ -74,6 +78,8 @@ Viewer::~Viewer() {
 
   m_Annotation->Delete();
   m_Marker->Delete();
+  if (m_CameraWidget)
+    m_CameraWidget->Delete();
   m_Renderer->Delete();
   m_RenderWindow->Delete();
 }
@@ -105,6 +111,13 @@ void Viewer::InstallPipe() {
   m_Marker->SetEnabled(true);
   m_Marker->InteractiveOff();
 
+  // camera orientation widget //
+  if (m_CameraWidget) {
+    m_CameraWidget->SetParentRenderer(m_Renderer);
+    m_CameraWidget->SetInteractor(renderWindowInteractor);
+    m_CameraWidget->On();
+  }
+
   // Must be rendered here in Vtk-6.0 or seg-fault //
   m_RenderWindow->Render();
 }
@@ -135,6 +148,17 @@ void Viewer::RemovePuppet(Puppet &prop) {
   m_Renderer->Render();
 }
 
+vtkSmartPointer<vtkCameraOrientationWidget>
+Viewer::MakeCameraOrientationWidget(vtkRenderWindowInteractor *interactor,
+                                    vtkRenderer *renderer) {
+  vtkSmartPointer<vtkCameraOrientationWidget> widget =
+      vtkSmartPointer<vtkCameraOrientationWidget>::New();
+  widget->SetParentRenderer(renderer);
+  widget->SetInteractor(interactor);
+  widget->On();
+  return widget;
+}
+
 void Viewer::Start() { m_RenderWindow->GetInteractor()->Start(); }
 
 vtkCornerAnnotation *Viewer::GetAnnotation() { return m_Annotation; }
@@ -145,6 +169,8 @@ vtkRenderWindowInteractor *Viewer::GetInteractor() {
   return m_RenderWindow->GetInteractor();
 }
 
+vtkCameraOrientationWidget *Viewer::GetCameraWidget() { return m_CameraWidget; }
+
 void Viewer::Reset() {
   this->ZoomAuto();
   m_Renderer->Render();
diff --git a/src/Vtk/uLibVtkViewer.h b/src/Vtk/uLibVtkViewer.h
index b846540..4185d2b 100644
--- a/src/Vtk/uLibVtkViewer.h
+++ b/src/Vtk/uLibVtkViewer.h
@@ -33,12 +33,14 @@
 #include <vtkOrientationMarkerWidget.h>
 #include <vtkRenderWindow.h>
 #include <vtkRenderer.h>
+#include <vtkSmartPointer.h>
 
 class vtkProp;
 class vtk3DWidget;
 class vtkCornerAnnotation;
 class vtkRenderWindowInteractor;
 class vtkRenderer;
+class vtkCameraOrientationWidget;
 
 namespace uLib {
 namespace Vtk {
@@ -62,6 +64,10 @@ public:
 
   void AddWidget(vtk3DWidget *widget);
 
+  static vtkSmartPointer<vtkCameraOrientationWidget>
+  MakeCameraOrientationWidget(vtkRenderWindowInteractor *interactor,
+                              vtkRenderer *renderer);
+
   void Reset();
   void ZoomAuto();
 
@@ -73,6 +79,8 @@ public:
 
   vtkRenderWindowInteractor *GetInteractor();
 
+  vtkCameraOrientationWidget *GetCameraWidget();
+
   void addProp(vtkProp *prop);
 
   void RemoveProp(vtkProp *prop);
@@ -85,6 +93,7 @@ private:
   vtkRenderWindow *m_RenderWindow;
   vtkCornerAnnotation *m_Annotation;
   vtkOrientationMarkerWidget *m_Marker;
+  vtkCameraOrientationWidget *m_CameraWidget;
 };
 
 template <> class Tie<Viewer> {
diff --git a/src/Vtk/vtkContainerBox.h b/src/Vtk/vtkContainerBox.h
index 7d2d02e..23a3b0b 100644
--- a/src/Vtk/vtkContainerBox.h
+++ b/src/Vtk/vtkContainerBox.h
@@ -47,7 +47,8 @@ protected:
   vtkActor *m_Cube;
   vtkActor *m_Axes;
   vtkActor *m_Pivot;
-  vtkContainerBox::Content *m_Content;
+
+  Content *m_Content;
 };
 
 } // namespace Vtk
diff --git a/src/Vtk/vtkHandlerWidget.cpp b/src/Vtk/vtkHandlerWidget.cpp
index 41e3475..e039565 100644
--- a/src/Vtk/vtkHandlerWidget.cpp
+++ b/src/Vtk/vtkHandlerWidget.cpp
@@ -24,6 +24,7 @@
 //////////////////////////////////////////////////////////////////////////////*/
 
 #include "vtkHandlerWidget.h"
+#include <iostream>
 #include <vtkArcSource.h>
 #include <vtkArrowSource.h>
 #include <vtkCallbackCommand.h>