[vtkusers] vtkCompositeManager + ParallelIso.cxx

[Paul McGuinness]

Hi Users,

I am taking out vtkOutputPort, vtkInputPort and vtkAppendPolyData from
the ParallelIso.cxx example and replacing them with the functionality of
vtkCompositeManager, but I am getting the error :

ERROR: In
/home/cs/VTK/VTK-4.2.2/Rendering/vtkXOpenGLRenderWindow.cxx, line
1005
vtkXOpenGLRenderWindow (0x8435600): bad X server connection.


ERROR: In
/home/cs/VTK/VTK-4.2.2/Rendering/vtkXOpenGLRenderWindow.cxx, line
166
vtkXOpenGLRenderWindow (0x8435600): bad X server connection.


Does anyone know how to resolve this? I have attached the MyMain
function of the code below. I would be very grateful for you help.

Paul.


void MyMain( vtkMultiProcessController *controller, void *arg )
{
 vtkImageReader *reader;
  vtkContourFilter *iso;
  vtkElevationFilter *elev;
  int myid, numProcs;
  float val;
  int numTris;
  char* fname = reinterpret_cast<char*>(arg);

  // Obtain the id of the running process and the total
  // number of processes
  myid = controller->GetLocalProcessId();
  numProcs = controller->GetNumberOfProcesses();

  // Create the reader, the data file name might have
  // to be changed depending on where the data files are.
  reader = vtkImageReader::New();
  reader->SetDataByteOrderToLittleEndian();
  reader->SetDataExtent(0, 63, 0, 63, 1, 93);
  reader->SetFilePrefix(fname);
  reader->SetDataSpacing(3.2, 3.2, 1.5);

  // Iso-surface.
  iso = vtkContourFilter::New();
  iso->SetInput(reader->GetOutput());
  iso->SetValue(0, ISO_START);
  iso->ComputeScalarsOff();
  iso->ComputeGradientsOff();

  // Compute a different color for each process.
  elev = vtkElevationFilter::New();
  elev->SetInput(iso->GetOutput());
  vtkMath::RandomSeed(myid * 100);
  val = vtkMath::Random();
  elev->SetScalarRange(val, val+0.001);



      vtkRenderer *ren = vtkRenderer::New();
      vtkRenderWindow *renWindow = vtkRenderWindow::New();
      vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
      vtkPolyDataMapper *Mapper = vtkPolyDataMapper::New();
      vtkActor *Actor = vtkActor::New();


      renWindow->AddRenderer(ren);
      iren->SetRenderWindow(renWindow);
      ren->SetBackground(1, 1, 1);
      renWindow->SetSize( 400, 400);
      renWindow->OffScreenRenderingOn();


      Mapper->SetInput((vtkPolyData *)elev->GetOutput());
      Actor->SetMapper(Mapper);

	ren->AddActor(Actor);
	renWindow->Render();

      	vtkCompositeManager* tc = vtkCompositeManager::New();
  	tc->SetRenderWindow(renWindow);
   	tc->InitializePieces();
	tc->StartInteractor();


    ren->Delete();
    renWindow->Delete();
    iren->Delete();
    mapper->Delete();
    actor->Delete();
  reader->Delete();
  iso->Delete();
  elev->Delete();

}