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IDProjectCategoryView StatusDate SubmittedLast Update
0011911VTK(No Category)public2011-03-01 08:082016-08-12 09:55
ReporterSergey Slyadnev 
Assigned ToJean-Christophe Fillion-Robin 
PrioritynormalSeverityminorReproducibilityhave not tried
StatusclosedResolutionmoved 
PlatformOSOS Version
Product Version 
Target VersionFixed in Version 
Summary0011911: vtkXOpenGLRenderWindow: window appears in off-screen rendering mode
DescriptionTests were performed on Red Hat 5.5 (64bit) with VTK 5.6.1.

I've tried to enable the off-screen rendering mode on both Windows & Linux platforms with vtkRenderWindow::SetOffScreenRendering() method. While it works properly on Windows, the blank rendering window is surprisingly displayed on Linux.

Here is my sample code:

==========================================================================
vtkSmartPointer<vtkRenderWindow> aRenderWindow =
  vtkSmartPointer<vtkRenderWindow>::New();
vtkSmartPointer<vtkRenderer> aRenderer =
  vtkSmartPointer<vtkRenderer>::New();
aRenderWindow->AddRenderer(aRenderer);

aRenderWindow->SetOffScreenRendering(1);
aRenderWindow->SetSize(600, 600);

vtkSmartPointer<vtkCamera> aCamera = aRenderer->GetActiveCamera();
aCamera->ParallelProjectionOn();
aCamera->SetPosition(1.0, 1.0, 1.0);
aRenderer->ResetCamera();

vtkSmartPointer<vtkActor> anActor = vtkSmartPointer<vtkActor>::New();
vtkSmartPointer<vtkPolyDataMapper> aMapper =
  vtkSmartPointer<vtkPolyDataMapper>::New();
vtkSmartPointer<vtkSphereSource> aSphereSource =
  vtkSmartPointer<vtkSphereSource>::New();
aMapper->SetInput( aSphereSource->GetOutput() );
anActor->SetMapper(aMapper);
aRenderer->AddActor(anActor);

vtkSmartPointer<vtkPNGWriter> aPNGWriter =
  vtkSmartPointer<vtkPNGWriter>::New();
vtkSmartPointer<vtkWindowToImageFilter> aWinToImageFilter =
  vtkSmartPointer<vtkWindowToImageFilter>::New();

aWinToImageFilter->SetInput(aRenderWindow);
aWinToImageFilter->SetInputBufferTypeToRGB();
aWinToImageFilter->SetMagnification(1);
aWinToImageFilter->ShouldRerenderOn();
aWinToImageFilter->Update();

aPNGWriter->SetInput( aWinToImageFilter->GetOutput() );
aPNGWriter->SetFileName("sphere_output.png");
aPNGWriter->Write();
==========================================================================

It seems like there is a problem in vtkXOpenGLRenderWindow, line 0000643:

=================================================
if(this->OwnWindow)
{
  ...
  XMapWindow(this->DisplayId, this->WindowId);
  ...
=================================================

This code is executed even in the off-screen rendering mode. I've used the following patch to prevent the window from mapping:

=================================================
if(this->OwnWindow !this->OffScreenRendering)
{
  ...
  XMapWindow(this->DisplayId, this->WindowId);
  ...
=================================================

I resolves the problem with the blank window. Do you think it is possible to apply that patch on future versions of VTK?
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 Relationships
related to 0011912closedJean-Christophe Fillion-Robin vtkXOpenGLRenderWindow: blank window appears in off-screen rendering mode 

  Notes
(0030917)
Jean-Christophe Fillion-Robin (manager)
2013-06-05 15:56

 Updated testcase:

#include <vtkActor2D.h>
#include <vtkCamera.h>
#include <vtkNew.h>
#include <vtkPNGWriter.h>
#include <vtkPolyDataMapper.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>
#include <vtkWindowToImageFilter.h>

int main(int, char* [])
{
  vtkNew<vtkRenderWindow> aRenderWindow;
  vtkNew<vtkRenderer> aRenderer;
  aRenderWindow->AddRenderer(aRenderer.GetPointer());

  aRenderWindow->SetOffScreenRendering(1);
  aRenderWindow->SetSize(600, 600);

  vtkSmartPointer<vtkCamera> aCamera = aRenderer->GetActiveCamera();
  aCamera->ParallelProjectionOn();
  aCamera->SetPosition(1.0, 1.0, 1.0);
  aRenderer->ResetCamera();

  vtkNew<vtkActor> anActor;
  vtkNew<vtkPolyDataMapper> aMapper;
  vtkNew<vtkSphereSource> aSphereSource;
  aMapper->SetInputConnection( aSphereSource->GetOutputPort() );
  anActor->SetMapper(aMapper.GetPointer());
  aRenderer->AddActor(anActor.GetPointer());

  vtkNew<vtkPNGWriter> aPNGWriter;
  vtkNew<vtkWindowToImageFilter> aWinToImageFilter;

  aWinToImageFilter->SetInput(aRenderWindow.GetPointer());
  aWinToImageFilter->SetInputBufferTypeToRGB();
  aWinToImageFilter->SetMagnification(1);
  aWinToImageFilter->ShouldRerenderOn();
  aWinToImageFilter->Update();

  aPNGWriter->SetInputConnection( aWinToImageFilter->GetOutputPort() );
  aPNGWriter->SetFileName("sphere_output.png");
  aPNGWriter->Write();

  return 0;
}
(0030918)
Jean-Christophe Fillion-Robin (manager)
2013-06-05 15:59
edited on: 2013-06-05 16:00

 Off screen rendering has been tested using VTK 6 (384636ec) and VTK 5.10.1 on Ubuntu 10.04 using the provided testcase and it works as expected.
(0034309)
Clinton Stimpson (developer)
2015-03-16 11:50

 This is not resolved for me. The provided test case using VTK 5.10.1 still pops up a window.

Also, vtkOpenGLExtensionManager directly calls vtkXOpenGLRenderWindow::CreateAWindow().

I do not see a the check for this->OffScreenRendering, before XMapWindow() is called in either 5.10.1 or the master branch.
(0034310)
Clinton Stimpson (developer)
2015-03-16 11:51

 Also, there is a popup window on Mac/Cocoa.
(0037222)
Kitware Robot (administrator)
2016-08-12 09:55

 Resolving issue as `moved`.

This issue tracker is no longer used. Further discussion of this issue may take place in the current VTK Issues page linked in the banner at the top of this page.

 Issue History
Date Modified Username Field Change
2011-03-01 08:08 Sergey Slyadnev New Issue
2013-06-05 15:56 Jean-Christophe Fillion-Robin Note Added: 0030917
2013-06-05 15:56 Jean-Christophe Fillion-Robin Assigned To => Jean-Christophe Fillion-Robin
2013-06-05 15:56 Jean-Christophe Fillion-Robin Status backlog => tabled
2013-06-05 15:59 Jean-Christophe Fillion-Robin Note Added: 0030918
2013-06-05 15:59 Jean-Christophe Fillion-Robin Status tabled => closed
2013-06-05 15:59 Jean-Christophe Fillion-Robin Resolution open => fixed
2013-06-05 15:59 Jean-Christophe Fillion-Robin Fixed in Version => 5.10.1
2013-06-05 16:00 Jean-Christophe Fillion-Robin Note Edited: 0030918
2013-06-05 16:08 Jean-Christophe Fillion-Robin Relationship added related to 0011912
2015-03-16 11:50 Clinton Stimpson Note Added: 0034309
2015-03-16 11:50 Clinton Stimpson Status closed => backlog
2015-03-16 11:50 Clinton Stimpson Resolution fixed => reopened
2015-03-16 11:51 Clinton Stimpson Note Added: 0034310
2016-07-06 16:47 Berk Geveci Status backlog => expired
2016-08-12 09:55 Kitware Robot Note Added: 0037222
2016-08-12 09:55 Kitware Robot Status expired => closed
2016-08-12 09:55 Kitware Robot Fixed in Version 5.10.1 =>
2016-08-12 09:55 Kitware Robot Resolution reopened => moved

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