add assembly

src/Vtk/Math/vtkCylinder.h

@@ -29,6 +29,7 @@
 #include "Math/Cylinder.h"
 #include "Vtk/uLibVtkInterface.h"
 #include <vtkActor.h>
+class vtkAssembly;
 
 namespace uLib {
 namespace Vtk {
@@ -53,11 +54,14 @@ public:
   /** Synchronizes the uLib model matrix with the VTK actor (e.g., after UI manipulation) */
   virtual void Update();
 
+  virtual uLib::Object* GetContent() const override { return (uLib::Object*)m_Content; }
+
 protected:
   /** Sets up the VTK visualization pipeline */
   virtual void InstallPipe();
 
   vtkActor *m_Actor;
+  ::vtkAssembly *m_VtkAsm;
   Content *m_Content;
 };