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<p style="margin-top:0;margin-bottom:0">I've attached the small example. It's identical to the working ExtractVisibleCells example except for the small addition of the QVTKOpenGLWidget and using its render window rather than having one standalone.</p>
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<p style="margin-top:0;margin-bottom:0">I'm actually using this version of VTK 9 (<a href="https://github.com/Slicer/VTK/tree/slicer-v9.0.0-2018-04-17-10e8cdc" class="OWAAutoLink" id="LPlnk558861" previewremoved="true">https://github.com/Slicer/VTK/tree/slicer-v9.0.0-2018-04-17-10e8cdc</a>)
which seems to date back to April 2018.</p>
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<p style="margin-top:0;margin-bottom:0">Thanks,</p>
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<p style="margin-top:0;margin-bottom:0">Franklin<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Ken Martin <ken.martin@kitware.com><br>
<b>Sent:</b> Wednesday, July 18, 2018 2:48:44 PM<br>
<b>To:</b> King, Franklin<br>
<b>Cc:</b> vtkusers@public.kitware.com<br>
<b>Subject:</b> Re: [vtkusers] vtkHardwareSelector blacking out window with QVTKOpenGLWidget</font>
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<div dir="ltr">How recent is the VTK you tried with, there were significant changes made to this code in the past week? Can you zip up a small example I could build and try?</div>
<div class="x_gmail_extra"><br>
<div class="x_gmail_quote">On Wed, Jul 18, 2018 at 1:31 PM, King, Franklin <span dir="ltr">
<<a href="mailto:fking1@bwh.harvard.edu" target="_blank">fking1@bwh.harvard.edu</a>></span> wrote:<br>
<blockquote class="x_gmail_quote" style="margin:0 0 0 .8ex; border-left:1px #ccc solid; padding-left:1ex">
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<p style="margin-top:0; margin-bottom:0">Hi,</p>
<p style="margin-top:0; margin-bottom:0"><br>
</p>
<p style="margin-top:0; margin-bottom:0">I've been attempting to run what is essentially this example of
<span>extracting visible cells using vtkHardwareSelector</span> (<a href="https://www.vtk.org/Wiki/VTK/Examples/Cxx/Filtering/ExtractVisibleCells" rel="noopener noreferrer" class="x_m_6598976782273087807x_OWAAutoLink" id="x_m_6598976782273087807LPlnk127696" target="_blank">https://www.vtk.org/Wiki/VTK/<wbr>Examples/Cxx/Filtering/<wbr>ExtractVisibleCells</a>)
but with the render window displayed within a QVTKOpenGLWidge instead.</p>
<p style="margin-top:0; margin-bottom:0"><br>
</p>
<p style="margin-top:0; margin-bottom:0">Doing so, however, results in the entire window failing to render and appearing black upon this line:</p>
<pre class="x_m_6598976782273087807x_de1">vtkSelection<span class="x_m_6598976782273087807x_sy2">*</span> selection <span class="x_m_6598976782273087807x_sy1">=</span> selector<span class="x_m_6598976782273087807x_sy2">-</span><span class="x_m_6598976782273087807x_sy1">></span>Select<span class="x_m_6598976782273087807x_br0">(</span><span class="x_m_6598976782273087807x_br0">)</span><span class="x_m_6598976782273087807x_sy4">;</span></pre>
<p style="margin-top:0; margin-bottom:0"><span>I've tried disabling multisampling with both QSurfaceFormat and vtkRenderWindow to no avail.</span><br>
</p>
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</p>
<p style="margin-top:0; margin-bottom:0">The window does, however, briefly render correctly (and the selection appearing successful) upon resizing events. Curiously, with a debug build it also renders correctly upon calling Select() again.</p>
<p style="margin-top:0; margin-bottom:0"><br>
</p>
<p style="margin-top:0; margin-bottom:0">I am using VTK 9 with Qt 5.10.1, and I've confirmed that there is no issue when implementing with just a vtkRenderWindow or using QVTKWidget in VTK 7. Any idea as to what is going wrong?</p>
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</p>
<p style="margin-top:0; margin-bottom:0">Thanks,<br>
</p>
<p style="margin-top:0; margin-bottom:0"><br>
</p>
Franklin</div>
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