[vtk-developers] Interaction with color/opacity editors in vtkChartXY broken on retina display

[Utkarsh Ayachit]

I suspect there's a bug in Qt when it comes to reparenting QOpenGLWidget. I
can reproduce an issue with ParaView on linux when I simply undock the
Color Map Editor and then redock it. The Color/Opacity widgets stay black.
Looking at the code, I see this [1] happens when the dock widget is docked
back into the main window. As expected the OpenGL context is destroyed, and
QVTKOpenGLWIdget correctly does the cleanup. But the QVTKOpenGLWidget never
gets a follow on paintGL call (unless I mouse over to resize the dock panel
manually). Thus QVTKOpenGLWidget new repaints into the newly minted
OpenGLContext/FBO resulting in a black widget.

Utkarsh

[1]
https://code.woboq.org/qt5/qtbase/src/widgets/kernel/qopenglwidget.cpp.html#1418


On Mon, May 29, 2017 at 11:06 AM, Marcus D. Hanwell <
marcus.hanwell at kitware.com> wrote:

> On Mon, May 29, 2017 at 9:32 AM, Elvis Stansvik
> <elvis.stansvik at orexplore.com> wrote:
> >
> > 2017-05-29 15:26 GMT+02:00 Sebastien Jourdain <
> sebastien.jourdain at kitware.com>:
> > > You need to set the size on the interactor.
> >
> > Ah, how do I do that? (sorry for being a bit dumb)
> >
> > I've been scouring over the PV code, and I can't see that it does
> > anything special with its interactor. It seems to just hook it up:
> >
> I assume you are using QVTKOpenGLWidget, we use this directly in
> Tomviz for a few charts that control color/opacity too. This should be
> handled in the QVTKOpenGLWidget, but it is possible an initialization
> bug has crept in. I have noticed that ParaView often doesn't see this
> issues as much due to resizing Qt widgets several times on startup, I
> will see if I can get some time to test the latest Tomviz (we had this
> working, but I haven't been tracking VTK master as closely these last
> few weeks).
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