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

[Dan Lipsa]

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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