[vtkusers] Issues using QVTKOpenGLWidget

[Sankhesh Jhaveri]

Hi Boris,

Regarding the vtkHardwareSelector issue, try disabling multisampling on the
QSurfaceFormat before setting the default surface format.

QSurfaceFormat fmt = QVTKOpenGLWidget::defaultFormat();
fmt.setSamples(0);
QSurfaceFormat::setDefaultFormat(fmt);

Hope that helps.

Cheers,
Sankhesh
​

On Mon, Oct 30, 2017 at 12:54 PM Boris Basic <baljci at hotmail.com> wrote:

> Hi,
>
>
> I'm currently porting an existing finite element mesh analysis application
> from VTK 7.0 to VTK 8.x (actually the last master to be ready for the
> upcoming 8.1 version). But when switching to the new QVTKOpenGLWidget, I
> encountered too issues, one relatively minor, the other pretty annoying.
>
>
> The first and biggest problem is selection, both using vtkHardwareSelector
> from surface selection, and the vtkRenderedAreaPicker for frustum
> selection. The vtkHardwareSelector sometimes simply fails to select the
> points properly, whereas it always worked with the previous QVTKWidget.
> Unfortunately, it's very random, and I can't manage to get a working
> example showing the issue on each selection. For the vtkRenderedAreaPicker,
> the problem is that the render window becomes black while the picker is
> working.
>
>
> The second and minor issue, the first I encountered, concerns a
> transparency problem with the new widget rendering. Lines seems to blend
> with the background. I opened an issue here for that one:
> https://gitlab.kitware.com/vtk/vtk/issues/17154. It's not as important as
> the selection bug, but it was the first issue I saw. It is only visible
> when multisampling is enabled.
>
>
> Boris
>
>
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-- 
Sankhesh Jhaveri *Sr. Research & Development Engineer* | Kitware
<http://www.kitware.com/> | (518) 881-4417
​
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