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<p>Hi,</p>
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</p>
<p>I'm currently porting an existing finite element mesh analysis application from VTK 7.0 to VTK 8.x (actually the last master to be ready for the upcoming 8.1 version). But w<span style="font-size:12pt">hen switching to the new
</span><span style="font-size:12pt">QVTKOpenGLWidget, I encountered too issues, one relatively minor, the other pretty annoying.</span></p>
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</span></p>
<p><span style="font-size:12pt">The first and biggest problem is selection, both using vtkHardwareSelector from surface selection, and the vtkRenderedAreaPicker for frustum selection. The vtkHardwareSelector sometimes simply fails to select the points properly,
whereas it always worked with the previous QVTKWidget. Unfortunately, it's very random, and I can't manage to get a working example showing the issue on each selection. For the <span style="font-family:Calibri,Helvetica,sans-serif,EmojiFont,"Apple Color Emoji","Segoe UI Emoji",NotoColorEmoji,"Segoe UI Symbol","Android Emoji",EmojiSymbols; font-size:16px">vtkRenderedAreaPicker,
the problem is that the render window becomes black while the picker is working.</span></span></p>
<p><span style="font-size:12pt"><span style="font-family:Calibri,Helvetica,sans-serif,EmojiFont,"Apple Color Emoji","Segoe UI Emoji",NotoColorEmoji,"Segoe UI Symbol","Android Emoji",EmojiSymbols; font-size:16px"><br>
</span></span></p>
<p><span style="font-size:12pt"><span style="font-family:Calibri,Helvetica,sans-serif,EmojiFont,"Apple Color Emoji","Segoe UI Emoji",NotoColorEmoji,"Segoe UI Symbol","Android Emoji",EmojiSymbols; font-size:16px">The second and minor issue, the first I encountered,
concerns a transparency problem with the new widget rendering. Lines seems to blend with the background. I opened an issue here for that one: <a href="https://gitlab.kitware.com/vtk/vtk/issues/17154" class="OWAAutoLink" id="LPlnk24250" previewremoved="true">https://gitlab.kitware.com/vtk/vtk/issues/17154</a>.
It's not as important as the selection bug, but it was the first issue I saw. It is only visible when multisampling is enabled.</span></span></p>
<p><span style="font-size:12pt"><span style="font-family:Calibri,Helvetica,sans-serif,EmojiFont,"Apple Color Emoji","Segoe UI Emoji",NotoColorEmoji,"Segoe UI Symbol","Android Emoji",EmojiSymbols; font-size:16px"><br>
</span></span></p>
<p>Boris</p>
<p><span style="font-size:12pt"><span style="font-family:Calibri,Helvetica,sans-serif,EmojiFont,"Apple Color Emoji","Segoe UI Emoji",NotoColorEmoji,"Segoe UI Symbol","Android Emoji",EmojiSymbols; font-size:16px"></span></span></p>
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</span></p>
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