[vtk-developers] Antialiasing broken in Qt5

[Marcus D. Hanwell]

Marcus D. Hanwell, Ph.D.
Technical Leader, Kitware Inc.
(518) 881-4937


On Thu, May 14, 2015 at 10:21 AM, David Lonie <david.lonie at kitware.com> wrote:
> I setup a Qt5 build, and this is indeed a problem.
>
> It looks like we'll need to do some more work to get VTK to play nice with
> Qt5, at least on X11 (possibly other windowing systems as well). The root
> cause of the multisampling problem is that Qt5 no longer provides things
> like Q_WS_X11 and QX11Info, and the section of QVTKWidget::SetRenderWindow
> that initializes the GLX visual is inside a "#ifdef Q_WS_X11" block, and
> thus never gets called. It appears that all of the visual configuration
> (double buffering, stencil, MSAA, alpha planes, etc) are currently not being
> used when build against Qt5 on (at least) X11 as a result.
>
> For now, the only workaround I see is to stick with Qt4 until this can be
> addressed. I've filed a bug here:
>
> http://www.vtk.org/Bug/view.php?id=15469
>
> Dave
>
> On Tue, May 12, 2015 at 8:32 AM, David Lonie <david.lonie at kitware.com>
> wrote:
>>
>> Bumping -- can someone with a Qt5 build around do a quick test to see if
>> multisampling works in a QVTKWidget? Has anyone been working on Qt5 support
>> that might have an idea what's happening?
>>
>> On Thu, May 7, 2015 at 9:17 AM, David Lonie <david.lonie at kitware.com>
>> wrote:
>>>
>>> On Thu, May 7, 2015 at 8:31 AM, Christoph Kolb
>>> <c.kolb at dkfz-heidelberg.de> wrote:
>>>>
>>>> your fix works for me in the RGrid example and also in SimpleView with
>>>> Qt4.
>>>> But not in Qt5.
>>>> If you run the SimpleView example with Qt5, multisampling is off again
>>>> which is inexplicable to me because in my understanding the QVTKWidget was
>>>> simply painting the GL buffer rendered by a vtkRenderWindow which should
>>>> already be antialiased... Is that wrong?
>>>
>>>
>>> Hmm, I'm not super familiar with the Qt layer in VTK. Perhaps someone
>>> else on the list might know?
>>>
>>> Looking at the QVTKWidget implementation, I don't see why the Qt version
>>> would make a difference regarding MSAA. Let's see if someone on the list has
>>> any ideas, and I'll ask around to see what I can find out.
>>>
>>> Dave
>>
>>
>
>
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