[vtkusers] How to "undo" GetRenderWindow()->Render()?

[Jan Niklas Hasse]

Hi Dan,

yes, kind of. The problem is, that with a lot of tabs I'm getting:

Maximum number of clients reached
ERROR: In [...]/VTK/Rendering/OpenGL/vtkXOpenGLRenderWindow.cxx, line 530
vtkXOpenGLRenderWindow (0x32b207d0): bad X server connection. DISPLAY=:0. Aborting.

calling chart->SetVisible(false) doesn't help unfortunately. I need to completely destroy the view somehow in hideEvent.

Thanks
Jan

On Fri, 18 Nov 2016, at 14:57, Dan Lipsa wrote:
> Jan,
> To hide items in a scene you have to  call SetVisible(false) on them. Is this what you are trying to do?
> 
> Dan
> 
> 
> 
> On Fri, Nov 18, 2016 at 5:51 AM, Jan Niklas Hasse <jan-niklas.hasse at stw.de> wrote:
>> Hi,
>>  
>>  I'm using VTK 6.2 with Qt. I've created a class Plot2D which inherits from QVTKWidget. I now have a lot of these plots widgets in a tabbed view and want to only render the ones that are currently visible (otherwise I get an OpenGL crash).
>>  
>>  void Plot2D::showEvent(QShowEvent*) {
>>      view = vtkSmartPointer<vtkContextView>::New();
>>      view->GetRenderer()->SetBackground(1,1,1);
>>      view->SetRenderWindow(GetRenderWindow());
>>      view->GetRenderWindow()->SetSize(width(),height());
>>      view->GetScene()->AddItem(chart);
>>      view->GetRenderWindow()->SetMultiSamples(0);
>>      view->GetRenderWindow()->Render();
>>  }
>>  
>>  void Plot2D::hideEvent(QHideEvent*) {
>>      view = nullptr;
>>  }
>>  
>>  Unfortunately, deleting the vtkContextView isn't enough: The next time showEvent is called, I get a crash inside VTK because it seems that view->GetRenderWindow()->Render(); has set up some kind of timer in the background. How would I solve this?
>>  
>>  Thanks in advance :)
>>  Jan
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