[vtkusers] Adding an ImageSlice to one renderer causes the image to disappear from a different renderer?

[David Doria]

I have this situation:

- A QMainWindow that contains a left and right QVTKWidget.
- A vtkImageData* LeftImageData that will be displayed in the left QVTKWidget
- A vtkImageData* BothImageData that will be displayed in both QVTKWidgets

If I only add the ImageSlice made from BothImageData to the left
QVTKWidget, everything works as expected. However, as soon as I add
the BothImageSlice to the right QVTKWidget, it disappears from the
left QVTKWidget!

Has anyone seen anything like this before? Below is an excerpt:

void MainWindow::on_actionOpenImage_triggered()
{
  std::string filename = "bunny.jpg";

  JPEGReader->SetFileName(filename.c_str());
  JPEGReader->Update();

  this->LeftImageData->ShallowCopy(JPEGReader->GetOutput());

  // Clear everything
  this->LeftRenderer->RemoveAllViewProps();
  this->RightRenderer->RemoveAllViewProps();

  // Setup left pane
  this->LeftImageSliceMapper->SetInputConnection(this->LeftImageData->GetProducerPort());
  this->LeftImageSlice->SetMapper(this->LeftImageSliceMapper);
  this->LeftRenderer->AddViewProp(this->LeftImageSlice);

  // Setup the "Both" image
  Helpers::SetImageSize(this->LeftImageData, this->BothImageData);
  Helpers::CreateTransparentImage(this->LeftImageData,
this->BothImageData); // Makes BothImageData the same size as
LeftImageData, but transparent and empty

  this->BothImageSliceMapper->SetInputConnection(this->BothImageData->GetProducerPort());
  this->BothImageSlice->SetMapper(this->BothImageSliceMapper);

  // Add the "Both" image to both panes
  this->LeftRenderer->AddViewProp(this->BothImageSlice);
  this->RightRenderer->AddViewProp(this->BothImageSlice); // If this
is called (uncommented), the image in the *left* renderer
disappears???

  // Refresh
  this->LeftRenderer->ResetCamera();
  this->RightRenderer->ResetCamera();

  this->qvtkWidgetRight->GetInteractor()->Render();
  this->qvtkWidgetLeft->GetInteractor()->Render();
}


Unfortunately I could not try to recreate this without the Qt
components because I did not know how else to display two renderers.

The full code is available here:
http://daviddoria.com/Uploads/ImageSlice/

Thanks,

David