[vtkusers] VTK 6.2 and PyQt5?

Elvis Stansvik elvis.stansvik at orexplore.com
Fri Feb 5 11:15:52 EST 2016

2016-02-05 16:57 GMT+01:00 David Gobbi <david.gobbi at gmail.com>:

> On Fri, Feb 5, 2016 at 7:45 AM, Elvis Stansvik <
> elvis.stansvik at orexplore.com> wrote:
>> That worked great, except for a small issue with a missing
>> QWheelEvent::delta() in PyQt5 (see my merge request 1185).
>> However, with QWidget as base class, I'm getting some strange rendering.
>> With QGLWidget it looks fine.
>> See the attached screenshot. It shows the cone example from
>> QVTKRenderWindowInteractor.py with QWidget (left) and QGLWidget (right).
>> With QWidget, the cone faces seem partly transparent from some angles.
>> Any idea what might be going on? This is VTK 6.2.0, Kubuntu 15.10, on
>> Intel graphics (Thinkpad T440s).
> I think you forgot to attach the screenshot.   But I probably cannot
> answer your question, I don't use QVTKRenderWindowInteractor.py very often
> (I maintain it because I was one of the initial authors, 15 years ago!),
> and on my own system the QWidget base works fine.

Bah, of course I did. Attaching it here.

I see. Anyone else know what could cause the behavior shown in the

> From what people have reported, the need for QGLWidget varies from system
> to system and driver to driver.  Whatever you discover, please share with
> the list.

Alright, so you've heard about it before? Should there ever be a need for
QGLWidget, or should it be reported as a bug?

My system:

Thinkpad T440s
Intel HD Graphics 4400
Qt 5.5.1 / PyQt5 5.4.2 / VTK 6.2.0

All installed from Kubuntu repos (with backports repositories enabled).

I have no reason not to use QGLWidget instead of QWidget, so it's not a big
problem. I was mostly curious if others have seen this problem.


>  - David
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