[vtkusers] Trackball style ('t') interaction with QVTKRenderWindowInteractor behaves strange

[Elvis Stansvik]

2016-06-20 13:08 GMT+02:00 Elvis Stansvik <elvis.stansvik at orexplore.com>:

> 2016-06-16 14:37 GMT+02:00 Elvis Stansvik <elvis.stansvik at orexplore.com>:
>
>> Launching QVTKRenderWindowInteractor.py as a script, which brings up the
>> built-in cone example, if I hit 't' to switch to trackball style
>> interaction and then rotate the camera around for a few seconds, when I
>> release the mouse there's a noticable delay before the movement stops.
>>
>> The delay seems related to the time the interaction went on: If I rotate
>> around for a longer period, the period between releasing the mouse and the
>> movement finally stopping is longer.
>>
>> Any idea what might be going on here?
>>
>
> I've now found older reports of this on this list, and turns out it was a
> Qt 5 bug:
>
>     https://codereview.qt-project.org/#/c/126136/
>
> It's fixed in 5.6, but we're basing our product on Kubuntu 16.04. Is there
> nothing that can be done on the VTK or application side to work around this
> on the buggy Qt versions?
>
> Is anyone else in the same boat?
>

Seems I can work around the issue application-side with

        if self.timer.elapsed() > 16:
            interactor.Render()
            self.timer.start()

instead of a blind call to Render(), where self.timer is a QElapsedTimer().

Still a bit of an inconvenience though :(

Elvis


> Elvis
>
>
>>
>> Elvis
>>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://public.kitware.com/pipermail/vtkusers/attachments/20160620/68ed964b/attachment.html>