VTK/Examples/MultipleViewports

#include <vtkSphereSource.h>
#include <vtkProperty.h>
#include <vtkPolyData.h>
#include <vtkSmartPointer.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
 
#include <vtksys/ios/sstream>
 
int main(int argc, char *argv[])
{
 
  vtkSmartPointer<vtkRenderWindow> renderWindow = 
      vtkSmartPointer<vtkRenderWindow>::New();
 
  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = 
      vtkSmartPointer<vtkRenderWindowInteractor>::New();
 
  renderWindowInteractor->SetRenderWindow(renderWindow);
 
  //# Define viewport ranges
  double xmins[4] = {0,.5,0,.5};
  double xmaxs[4] = {0.5,1,0.5,1};
  double ymins[4] = {0,0,.5,.5};
  double ymaxs[4]= {0.5,0.5,1,1};
    for(unsigned i = 0; i < 4; i++)
      {
        vtkSmartPointer<vtkRenderer> renderer = 
            vtkSmartPointer<vtkRenderer>::New();
 
      renderWindow->AddRenderer(renderer);
      renderer->SetViewport(xmins[i],ymins[i],xmaxs[i],ymaxs[i]);
 
      //Create a sphere
      vtkSmartPointer<vtkSphereSource> sphereSource = 
          vtkSmartPointer<vtkSphereSource>::New();
      sphereSource->SetCenter(0.0, 0.0, 0.0);
      sphereSource->SetRadius(5);
      sphereSource->Update();
 
      //Create a mapper and actor
      vtkSmartPointer<vtkPolyDataMapper> mapper = 
          vtkSmartPointer<vtkPolyDataMapper>::New();
      mapper->SetInputConnection(sphereSource->GetOutputPort());
      vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
      actor->SetMapper(mapper);
      renderer->AddActor(actor);
      renderer->ResetCamera();
 
      renderWindow->Render();
      renderWindow->SetWindowName("Multiple ViewPorts");
      renderWindowInteractor->Start();
      }
 
  return EXIT_SUCCESS;
}