[vtkusers] QVTKWidget rendering performance

[Christoph Kolb]

Hi Dragan,

all is well in Qt4 and therefore I did not try the Qt5 patch yet.
Also, the problem (apparently) doesn't occur in the Qt5 opengl examples, 
even though I put a serious delay in the paint method.
So maybe it is possible to fix it without patching Qt5. I was also 
trying to adapt QVTKWidget2 to QOpenGLWidget (instead of the currently 
used QGLWidget) but this seems to be hard work...

Any other suggestions?

Regards
Christoph


On 03/04/2015 09:18 PM, Dragan Vidovic wrote:
> Hi Christoph
>
> Sorry for the duplicate report, I should have searched better. Yes, I
> am using Qt5 under the current version of Ubuntu and some cheap NVidia
> card (maybe GeForce 8400) with proprietary drivers. If necessary I can
> be more precise in the morning when I get to work.
>
> Did you try to see whether you will get the same behavior with Qt4?
> Did you try the proposed patch?
>
> Regards,
>
> Dragan
>
> On Wed, Mar 4, 2015 at 8:36 PM, Christoph Kolb
> <c.kolb at dkfz-heidelberg.de> wrote:
>> Hi Dragan,
>>
>> I'm assuming that you have used Qt5, because I have the same problem and
>> posted it to the vtk-developers list:
>>
>> http://markmail.org/message/l76z3mppijvpy6sn
>>
>> May I ask which os you are using?
>>
>> Regards
>> Christoph
>>
>>
>> On 03/04/2015 04:06 PM, Dragan Vidovic wrote:
>>> Hi
>>>
>>> I am writing a CAD program using VTK and Qt. I based it on the
>>> SimpleView example. When I rotate the view using the interactor the
>>> rendering is slow and lags behind the mouse movement. I am not posting
>>> any code here because this behavior is already apparent in the
>>> examples included with the distribution: if I start bin/SimpleView,
>>> press 't' to switch to the trackball mode, left click and rotate the
>>> scene around for a few seconds, when I stop it continues to move for a
>>> second or two before it stops. This does not happen with the examples
>>> not based on QVTKWidget, for instance with bin/SpecularSpheres. Is
>>> there a way to speed up the SimpleView example?
>>>
>>> I am using VTK-6.1.0 that I compiled myself under Ubuntu.
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