[vtk-developers] Antialiasing broken in Qt5

[Kilgus, Thomas]

Hi Marcus and David,

I would love to make this run with Qt5 for a demo application. Is there any (straightforward) job I can take care of to help tracking down the issue?

Regards,
Thomas


-----Ursprüngliche Nachricht-----
Von: vtk-developers [mailto:vtk-developers-bounces at vtk.org] Im Auftrag von Marcus D. Hanwell
Gesendet: Donnerstag, 14. Mai 2015 17:40
An: David Lonie
Cc: VTK Developers
Betreff: Re: [vtk-developers] Antialiasing broken in Qt5

Good to know, we need to do more testing with Qt 5 it seems, the API is pretty close but a lot fo the way they do platform abstraction chanegd (moving into plugins for each platform). I have ParaView build with Qt 5 here, and can try to dig into this a little more if I can find some time.

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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