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<p>Dear vtkusers,</p>
<p>I found a solution to my problem: The problem is obviously caused
by python's garbage collector. If I assign the vtkLineWidget2 to
an instance variable of the class MainWindow, it works as
expected. The same issue happens with other vtkWidgets, too.</p>
<p>I am interested to understand, why this actually happens. It is
not a problem for the vtkActor but only for the vtk...Widget.
Something must be fundamentally different between those classes
which causes that the vtk...Widget is garbage-collected although
it is still needed by vtk.</p>
<p>Best regards,<br>
Oliver<br>
</p>
<br>
<div class="moz-cite-prefix">Am 15.12.2017 um 12:02 schrieb Oliver
Natt:<br>
</div>
<blockquote type="cite"
cite="mid:21548920-7298-3c07-5950-445e6057e8eb@gmx.de">Dear
vtkusers,
<br>
<br>
for some reason, I cannot manage to get a vtkLineWidget2 working
in one of my PyQt-applications. Interestingly, the same code works
well in a regular vtk-window. Please find attaced two python
scripts. The first script "linewidget2_noQt.py" works exactly as
expected: A yellow cylinder and the line widget is rendered. I can
also interact with the widget by dragging the endpoints with the
mouse. However, the same code embedded into a Qt-Window (cf.
linewidget2_qt.py) does not work: The yellow cylinder is shown,
but the line widget is missing.
<br>
<br>
Do you have any suggestions how to get the vtkLineWidget2 working
in a PyQt-application?
<br>
<br>
Best regards,
<br>
Oliver
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
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