MFC & vtkWriter problem

[pahsieh at usgs.gov]

Agris:

> There is a little problem in a 'combination' of the 'vtkWriter' and the
MFC 'CFileDialog'.
> My MDI program renders to a 'CView' derived window and everything is fine
until I want to
> save the rendered image in a file, using a 'vtkWriter' derived class
(like 'vtkBMPWriter').
> The 'CFileDialog' window is hiding a part of the rendered image. In
saving the image using the
> 'vtkBMPWriter', it saves also a part of the dialog box, which was above
the image.

When you do

  vtkWindowToImageFilter* renSrc = vtkWindowToImageFilter::New();
   renSrc->SetInput(m_pRenderer->GetVTKWindow());

you capture the vtk window on the screen, including whatever is
covering parts of the window (for example, your file dialog box,
other modeless dialog boxes, or a help window that is
always on top).

The workaround is to render to memory, and write the bitmap
with the data from memory, something like the following:


 if( dlg.DoModal() == IDOK)
 {
  sFileName = dlg.GetPathName();

  // Insert the next 3 lines to render to memory, assuming your render
window is
  // called m_pRenderWindow, and is of type vtkWin32OpenGLRenderWindow.
  int *size = m_pRenderWindow->GetSize();
  m_pRenderWindow->SetupMemoryRendering(size[0], size[1], GetDC()
->GetSafeHdc());
  m_pRenderWindow->Render();

  vtkWindowToImageFilter* renSrc = vtkWindowToImageFilter::New();
   renSrc->SetInput(m_pRenderer->GetVTKWindow());

  vtkBMPWriter* writer = vtkBMPWriter::New();
   writer->SetInput(renSrc->GetOutput());
   writer->SetFileName(sFileName.GetBuffer(10));
   writer->Write();

  renSrc->Delete();
  writer->Delete();

  // Insert the next line to return to screen rendering
  m_pRenderWindow->ResumeScreenRendering();
 }






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