<div dir="ltr"><div class="markdown-here-wrapper" style="font-family:"Lucida Sans",Cantarell,Verdana,sans-serif;color:rgb(11,83,148)"><p style="margin:0px 0px 1.2em!important">Hi Mads,</p>
<p style="margin:0px 0px 1.2em!important">The error originates from the following line:</p>
<pre style="font-size:0.95em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code class="hljs language-cpp" style="font-size:0.95em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(218,218,218);background-color:rgb(232,232,232);border-radius:3px;display:inline;white-space:pre;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important;display:block;overflow-x:auto;padding:0.5em;background:rgb(29,31,33);color:rgb(197,200,198)">    interactor->Start();
</code></pre>
<p style="margin:0px 0px 1.2em!important">You don’t need to start the event loop manually with the <code style="font-size:0.95em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(218,218,218);background-color:rgb(232,232,232);border-radius:3px;display:inline">QVTKInteractor</code>. QVTKWidget would use Qt’s event loop.<br>Just remove the <code style="font-size:0.95em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(218,218,218);background-color:rgb(232,232,232);border-radius:3px;display:inline">Start()</code> call.</p>
<p style="margin:0px 0px 1.2em!important">Hope that helps.</p>
<p style="margin:0px 0px 1.2em!important">Sankhesh</p>
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LjwvZGl2PjxkaXY+PGJyPjwvZGl2PjxkaXY+U2Fua2hlc2g8L2Rpdj4=" style="height:0;width:0;max-height:0;max-width:0;overflow:hidden;font-size:0em;padding:0;margin:0">​</div></div></div><br><div class="gmail_quote"><div dir="ltr">On Wed, Aug 16, 2017 at 7:43 AM Mads M. Hansen <<a href="mailto:madsmh@gmail.com">madsmh@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Based on the example at<br>
<a href="http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/Follower" rel="noreferrer" target="_blank">http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/Follower</a><br>
<br>
I have tried to attach a text label to a number of objets (line<br>
106-149), however<br>
when the render method is called  (line 80 in the attached file)<br>
I get this message:<br>
<br>
/xxx/VTK-8.0.0/GUISupport/Qt/QVTKInteractor.cxx, line 147<br>
QVTKInteractor (0x1ea3da0): QVTKInteractor cannot control the event loop.<br>
<br>
and no text appeares on screen. I have been unable to figure out how<br>
to sort it out :(<br>
<br>
.. Mads<br>
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</blockquote></div><div dir="ltr">-- <br></div><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div class="inbox-markdown-here-wrapper" style="font-family:'proza libre',sans-serif;color:rgb(0,56,107)"><h5 id="inbox-sankhesh-jhaveri" style="margin:1.3em 0px 1em;padding:0px;font-size:1.1em;border-bottom-width:1px;border-bottom-style:solid;border-bottom-color:rgb(238,238,238);font-weight:bold;color:rgb(11,65,148)">Sankhesh Jhaveri</h5>
<h6 id="inbox--sr-research-development-engineer-kitware-http-www-kitware-com-518-881-4417" style="margin:1.3em 0px 1em;padding:0px;font-size:1em;color:rgb(11,83,148);font-family:'open sans',sans-serif;font-weight:normal"><em>Sr. Research & Development Engineer</em> | <a href="http://www.kitware.com/">Kitware</a> | (518) 881-4417</h6>
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