<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">Hi Richard, </div><div class="gmail_quote"><br></div><div class="gmail_quote">On Mon, Mar 24, 2014 at 10:25 AM, Richard Whitehead <span dir="ltr"><<a href="mailto:richard.whitehead@vivosight.com" target="_blank">richard.whitehead@vivosight.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr">David,<div>Unfortunately I am now in a really bad place. I have some long-winded calculations to do and then visualise, which I want to do in a background thread. This is for a commercial application and hanging the GUI is completely unacceptable. I have now invested several man-months into VTK and I have to decide whether to drop it. I think the only sensible thing I can do is to get rid of VTK from my calculations and only use it for visualisation.</div>
</div></blockquote><div><br></div><div>FYI, we have successfully used VTK in a multi-threaded environment for our VisGUI application framework (<a href="http://www.kitware.com/source/home/post/84">http://www.kitware.com/source/home/post/84</a>) specifically dealing with computations. Rendering was done single threaded though. The trick involved writing our own thread safe version of vtkSmartPointer (I believe you are doing something similar). </div>
<div><br></div><div>- Aashish</div><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<div dir="ltr">
<div>Many thanks,</div><div>Richard</div><div><br></div></div><div class="gmail_extra"><div class=""><br><br><div class="gmail_quote">On 24 March 2014 12:29, David Cole <span dir="ltr"><<a href="mailto:dlrdave@aol.com" target="_blank">dlrdave@aol.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">You are definitely not going crazy. The really, really rather foul thing, that frustrates me all the time, is when I must do some VTK operation which takes significant time (on the order of seconds or minutes, rather than the typical fraction of a second) ... and then it makes the GUI completely unresponsive until the operation is done.<br>
<br>
I spend rather a lot of my time making sure that everything I do that's VTK-based is at interactive speeds as much as possible to absolutely minimize the user pain associated with this.<br>
<br>
Pushing long operations completely into a separate non-GUI thread would be absolutely fantastic. I look forward to the day when such a thing becomes possible.<br>
<br>
<br>
:-)<span><font color="#888888"><br>
D<br>
<br>
</font></span></blockquote></div><br><br clear="all"><div><br></div></div><div class="">-- <br><div dir="ltr"><p style="color:rgb(80,0,80);font-family:Calibri;margin:0cm 0cm 0.0001pt"><span lang="EN" style="font-size:10pt;font-family:Arial,sans-serif">Richard Whitehead </span><b><span lang="EN" style="font-size:10pt;font-family:Arial,sans-serif;color:rgb(146,39,143)">–</span></b><span lang="EN" style="font-size:10pt;font-family:Arial,sans-serif"> Senior Imaging Engineer</span></p>
<p style="color:rgb(80,0,80);font-family:Calibri;margin:0cm 0cm 0.0001pt"><b><span lang="EN" style="font-size:10pt;font-family:Arial,sans-serif;color:rgb(146,39,143)">Michelson Diagnostics Ltd</span></b></p><p style="color:rgb(80,0,80);font-family:Calibri;margin:0cm 0cm 0.0001pt">
<b><span lang="EN" style="font-size:10pt;font-family:Arial,sans-serif;color:rgb(146,39,143)">M:</span></b><span lang="EN" style="font-size:10pt;font-family:Arial,sans-serif"> <a href="tel:%2B44%20%280%297905%20955276" value="+447905955276" target="_blank">+44 (0)7905 955276</a> </span><b><span lang="EN" style="font-size:10pt;font-family:Arial,sans-serif;color:rgb(146,39,143)">T:</span></b><span lang="EN" style="font-size:10pt;font-family:Arial,sans-serif"> <a href="tel:%2B44%20%280%2920%208308%201695" value="+442083081695" target="_blank">+44 (0)20 8308 1695</a></span></p>
<p style="color:rgb(80,0,80);font-family:Calibri;margin:0cm 0cm 0.0001pt"><b><span lang="EN" style="font-size:10pt;font-family:Arial,sans-serif;color:rgb(146,39,143)">E: </span></b><span lang="EN" style="font-size:10pt;font-family:Arial,sans-serif;color:rgb(0,176,240)"><a href="mailto:richard.whitehead@vivosight.com" style="color:rgb(17,85,204)" target="_blank"><span style="color:rgb(0,176,240)">richard.whitehead@vivosight.com</span></a></span><span lang="EN" style="font-size:10pt;font-family:Arial,sans-serif"> </span><b><span lang="EN" style="font-size:10pt;font-family:Arial,sans-serif;color:rgb(146,39,143)">W:</span></b><span lang="EN" style="font-size:10pt;font-family:Arial,sans-serif"> </span><span lang="EN" style="font-size:10pt;font-family:Arial,sans-serif;color:rgb(0,176,240)"><a href="http://www.vivosight.com/" style="color:rgb(17,85,204)" target="_blank"><span style="color:rgb(0,176,240)">www.vivosight.com</span></a></span></p>
<p style="color:rgb(80,0,80);font-family:Calibri;margin:0cm 0cm 0.0001pt"><br></p><p style="color:rgb(80,0,80);font-family:Calibri;margin:0cm 0cm 0.0001pt"><a href="http://www.vivosight.com/" target="_blank"><span style="color:windowtext;text-decoration:none"><img src="https://sites.google.com/a/vivosight.com/logo/_/rsrc/1361922206747/home/VivoSight.png" border="0"></span></a></p>
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<span style="font-size:7.5pt;font-family:Arial,sans-serif;color:gray">Michelson Diagnostics Ltd, 1 Grays Farm Production Village, Grays Farm Road, Orpington, Kent BR5 3BD, UK</span></p><p style="color:rgb(80,0,80);font-family:Calibri;margin:0cm 0cm 0.0001pt">
<span style="font-size:7.5pt;font-family:Arial,sans-serif;color:gray">Registered Office: 3 Shearwater, Maidstone, ME16 0DW. Registered in England No. 5732681</span></p></div>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br>| Aashish Chaudhary <br>| R&D Engineer <br>| Kitware Inc. <br>| <a href="http://www.kitware.com">www.kitware.com</a>
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