#include <iostream>
#include <vtkCylinderSource.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkProperty.h>
#include <vtkCamera.h>
#include <vtkSmartPointer.h>
#include <vtkNew.h>
#include <vtkOpenVRRenderWindow.h>
#include <vtkOpenVRRenderer.h>
#include <vtkOpenVRRenderWindowInteractor.h>
#include <vtkOpenVRCamera.h>

int main(int, char *[])
{
  // This creates a polygonal cylinder model with eight circumferential facets
  // (i.e, in practice an octagonal prism).
  vtkNew<vtkCylinderSource> cylinder;
  cylinder->SetResolution(8);

  // The mapper is responsible for pushing the geometry into the graphics library.
  // It may also do color mapping, if scalars or other attributes are defined.
  vtkNew<vtkPolyDataMapper> cylinderMapper;
  cylinderMapper->SetInputConnection(cylinder->GetOutputPort());

  // The actor is a grouping mechanism: besides the geometry (mapper), it
  // also has a property, transformation matrix, and/or texture map.
  // Here we set its color and rotate it around the X and Y axes.
  vtkNew<vtkActor> cylinderActor;
  cylinderActor->SetMapper(cylinderMapper);
  cylinderActor->GetProperty()->SetColor(1.0000, 0.3882, 0.2784);
  auto interpolation = cylinderActor->GetProperty()->GetInterpolation();
  std::cout << "The default Interpolation mode is " << interpolation << std::endl;
  cylinderActor->GetProperty()->SetInterpolationToFlat();
  cylinderActor->RotateX(30.0);
  cylinderActor->RotateY(-45.0);

  // The renderer generates the image
  // which is then displayed on the render window.
  // It can be thought of as a scene to which the actor is added
  vtkNew<vtkOpenVRRenderer> renderer;
  renderer->AddActor(cylinderActor);
  renderer->SetBackground(0.1, 0.2, 0.4);
  // Zoom in a little by accessing the camera and invoking its "Zoom" method.
  renderer->ResetCamera();
  renderer->GetActiveCamera()->Zoom(1.5);

  // The render window is the actual GUI window
  // that appears on the computer screen
  vtkNew<vtkOpenVRRenderWindow> renderWindow;
  renderWindow->SetSize(200, 200);
  renderWindow->AddRenderer(renderer);

  // The render window interactor captures mouse events
  // and will perform appropriate camera or actor manipulation
  // depending on the nature of the events.
  vtkNew<vtkOpenVRRenderWindowInteractor> renderWindowInteractor;
  renderWindowInteractor->SetRenderWindow(renderWindow);

  // This starts the event loop and as a side effect causes an initial render.
  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}