[vtk-developers] Communication between MultipleViewports

[darkcminor]

What I want is to get or capture an event inside a renderer and then
depending on event do something on other renderer, *Is this even possible*?.

Let me explain it better, I want to show a fixed plane  and a widget in one
renderer, the callbacks of that widget I would like to make something to
other renderer, for example scale a cube  controlling it from other viewport
renderer.



For instance to have MultipleViewports there is an  example
<http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/MultipleViewports>  

There they show spheres, but is it possible to make a link between
renderers?



#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, char *[])
{
  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;
}








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