add detector chamber projection plane representation in vtk

src/Vtk/HEP/Detectors/vtkDetectorChamber.h

@@ -39,6 +39,8 @@
 #include <vtkBoxWidget.h>
 #include <vtkTransformPolyDataFilter.h>
 
+class vtkPlaneSource;
+
 namespace uLib {
 namespace Vtk {
 
@@ -53,6 +55,12 @@ public:
   virtual ~vtkDetectorChamber();
 
   Content *GetContent();
+
+  virtual void contentUpdate() override;
+
+protected:
+  vtkActor *m_PlaneActor;
+  vtkPlaneSource *m_PlaneSource;
 };
 
 } // namespace Vtk