[vtkusers] Widget moving Problem with QWidgets containing vtkRenderer on OSX

[Cory Quammen]

Hi Lukas,

I believe qvtkwidget2 is the future, but as far as I know it doesn't
solve the problem. If you wanted to try it out and report back if it
works with Qt 5.x, that would be great.

Someone else with more knowledge about this issue may be able to jump
in here to let you know more details than I can provide.

Thanks,
Cory

On Wed, Jun 8, 2016 at 7:25 PM, Schulte, Lukas
<lukas.schulte at mpibpc.mpg.de> wrote:
> Hey Cory,
>
> Thanks for the fast reply. Are there any known workarounds like switching to qvtkwidget2 or something similar  ? And can I be of any help in identifying or resolving this issue?
> Cheers,
> Lukas
>
>
>> On 08 Jun 2016, at 17:14, Cory Quammen <cory.quammen at kitware.com> wrote:
>>
>> Lukas,
>>
>> Yes, folks have seen this kind of behavior in other applications that
>> use VTK with Qt 5.x on OS X. The problem has yet to be identified, but
>> should hopefully be resolved in the near future.
>>
>> Cory
>>
>> On Wed, Jun 8, 2016 at 1:32 PM, Schulte, Lukas
>> <lukas.schulte at mpibpc.mpg.de> wrote:
>>> Hey everyone,
>>>
>>>
>>>
>>> I’m currently porting a Linux/Windows Software to OSX 10.11, using C++,
>>> Qt5.6, VTK 7.0 and compiling using XCode 7.2 . Also I built the project
>>> using CMake.
>>>
>>>
>>>
>>> In one of the windows in an MDIArea I’m seeing a strange kind of behavior
>>> when the window is moved around :
>>>
>>>
>>>
>>> https://gfycat.com/DeficientHatefulGeese
>>>
>>>
>>>
>>> To me that looks like a problem with refreshing/updating maybe?
>>>
>>>
>>>
>>> The structure of the widget is the following:
>>>
>>>
>>>
>>> MainWidget(The one being moved around in the gif):
>>>
>>>  class ImageViewerWidget: public QMainWindow, public AbstractWidget
>>>
>>>
>>>
>>>  ImageViewerWidgets contains a QStackedWidget where the separate Widgets
>>> are added to.
>>>
>>>
>>>
>>> The problematic widget containing vtk :
>>>
>>>  class ImageVtkHaloWidget : public QWidget
>>>
>>>
>>>
>>> This Widget is setup like this:
>>>
>>>  QVTKWidget *_vtk = new QVTKWidget(this, QFlag(0));
>>>
>>>  QVBoxLayout *layout = new QVBoxLayout;
>>>
>>>  layout->addWidget(_vtk);
>>>
>>>
>>>
>>> Till that point everything works fine, but if a renderer is set the weird
>>> behavior of the gif can be seen:
>>>
>>>
>>>
>>>  vtkRenderer* _renderer = vtkRenderer::New();
>>>
>>>  _vtk->GetRenderWindow()->AddRenderer(_renderer);
>>>
>>>
>>>
>>> It’s not a problem with rendering in general as the rendering of the stuff
>>> inside the viewer works fine if the window is held still, just the moving
>>> around oft he widget results in weird behavior of the whole Widget.
>>>
>>>
>>>
>>> I couldn’t find anything about the reasons for these problems, so I figured
>>> I’d turn to people here for help. Has anyone ever seen something like this?
>>> If more information about my system or more code is needed, I’ll gladly
>>> provide it of course.
>>>
>>>
>>>
>>> Cheers,
>>>
>>>
>>>
>>> Lukas
>>>
>>>
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>>
>>
>> --
>> Cory Quammen
>> R&D Engineer
>> Kitware, Inc.



-- 
Cory Quammen
R&D Engineer
Kitware, Inc.