<div>Seb,</div><div><br></div><div>Right. The crashes are only when SWT is involved. I'll keep poking but like I say, I don't want to learn/build new tooling (if I can help it). But I find VTK kind of enigmatic in many respects. For example, I thought I would try the Cocoa version, just for fun. So I created a new VTK source and build folders, selected Xcode then ran configure, then generate. It said "Configure done", "Generate done". Then what? There's no makefile I can see to run the actual build. Is there another cmake step? I don't recall there being one when I generated the Java wrappers. I just ran make in the config then generate and there was a makefile. But this time no makefile. What am I missing?</div><div><br></div><div>Anyway, back to my real job. I'll take another look later. Again, thanks for your help.</div><div><br></div><div>Ric</div><div><br></div><div><br></div><span id="OLK_SRC_BODY_SECTION"><div style="font-family:Calibri; font-size:11pt; text-align:left; color:black; BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; BORDER-RIGHT: medium none; PADDING-TOP: 3pt"><span style="font-weight:bold">From: </span> "Sebastien Jourdain-2 [via VTK]" <<a href="/user/SendEmail.jtp?type=node&node=5722745&i=0" target="_top" rel="nofollow" link="external">[hidden email]</a>><br><span style="font-weight:bold">Date: </span> Wednesday, August 14, 2013 11:43 AM<br><span style="font-weight:bold">To: </span> Ric Wright <<a href="/user/SendEmail.jtp?type=node&node=5722745&i=1" target="_top" rel="nofollow" link="external">[hidden email]</a>><br><span style="font-weight:bold">Subject: </span> Re: AWT + SWT + Event Loops (was Re: VTK6 and Java Cone Example 5)<br></div><div><br></div>
        <div dir="ltr">Hi Ric,<div><br></div><div style="">I work mostly in C++ with ParaView, but I've used VTK in the past with Java and multi-threading without much trouble. But once again, I'm not talking about SWT, just pure Swing/AWT.</div><div style="">My question related to the crash was on the AWT/Swing example not SWT.</div><div style=""><br></div><div style="">Seb</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Wed, Aug 14, 2013 at 11:53 AM, rkwright <span dir="ltr"><<a href="/user/SendEmail.jtp?type=node&node=5722742&i=0" target="_top" rel="nofollow" link="external">[hidden email]</a>></span> wrote:<br><blockquote style='border-left:2px solid #CCCCCC;padding:0 1em' style="border-left:2px solid #CCCCCC;padding:0 1em" class="gmail_quote"><div>Seb,</div><div><br></div><div>Yes, the crash is the same. Sometimes it isn't even at close time - the app will hang then crash. When I have been able to pause inside and look or get a look at the stack it is buried way down in SWT or some inner message loop in VTK. I strongly suspect that it is some threading issue between VTK and SWT. You mentioned that VTK is not thread–safe while Eclipse and SWT use LOTS of threads. Like you say, if you stick with VTK alone (in ObjectiveC and/or C++) it is fine.</div><div><br></div><div>So if I want to write in Java and use Eclipse I a few choices:</div><ul><li>Give up on using Java and Eclipse, just use Xcode and Objective C/C++</li><li>Carefully use VTK, avoiding any danger spots (e.g. Interactors) but I won't know what to avoid until I get there</li><li>Abandon trying to use VTK and go back to my VTK equivalent which is far more primitive.</li></ul><div>My problem is that I don't want to fight the tools. I don’t WANT to write rendering systems, etc. Been there, done that (I've written parts 2 PostScript interpreters, was part of the SVG Viewer team at Adobe, Illustrator, etc.). I'm looking for a system I can just use and not have to fix or work around. It may be that the message is stop fighting and accept using Xcode. Is that what you work in? Xcode and Objective C/C++?</div><div><br></div><div>Thanks</div><div>Ric</div><div><br></div><div><br></div><span><div style="border-right:medium none;padding-right:0in;padding-left:0in;padding-top:3pt;text-align:left;font-size:11pt;border-bottom:medium none;font-family:Calibri;border-top:#b5c4df 1pt solid;padding-bottom:0in;border-left:medium none"><div class="im"><span style="font-weight:bold">From: </span> "Sebastien Jourdain-2 [via VTK]" <<a href="http://user/SendEmail.jtp?type=node&node=5722740&i=0" rel="nofollow" link="external" target="_blank">[hidden email]</a>><br></div><span style="font-weight:bold">Date: </span> Wednesday, August 14, 2013 10:41 AM<div class="im"><br><span style="font-weight:bold">To: </span> Ric Wright <<a href="http://user/SendEmail.jtp?type=node&node=5722740&i=1" rel="nofollow" link="external" target="_blank">[hidden email]</a>><br><span style="font-weight:bold">Subject: </span> Re: AWT + SWT + Event Loops (was Re: VTK6 and Java Cone Example 5)<br></div></div><div class="im"><div><br></div>
        <div dir="ltr">Hi Ric,<div><br></div><div>I have no experience with SWT, so I can't really help you here, but I can ensure you that VTK works just fine on Mac OS X with Java 6 and interaction. In fact, I never had any crash at close time.</div><div><br></div><div>Does the sample code from the vtk.jar crash in the same manner at close time ?</div><div><br></div><div>Seb</div></div></div><div><div class="h5"><div class="gmail_extra"><br><br><div class="gmail_quote">
On Wed, Aug 14, 2013 at 11:08 AM, rkwright <span dir="ltr"><<a href="http://user/SendEmail.jtp?type=node&node=5722739&i=0" rel="nofollow" link="external" target="_blank">[hidden email]</a>></span> wrote:<br><blockquote style='border-left:2px solid #CCCCCC;padding:0 1em' style="border-left:2px solid #CCCCCC;padding:0 1em" class="gmail_quote"><div><div>Sebastien,</div><div><br></div><div>(BTW, thank you <b>very</b> much for your patience in answering my questions in such timely fashion).</div><div><br></div><div>I didn't see the SWT option when I built VTK the first time. However, I took a break and quickly built an Eclipse plugin using the code in wrapping/java/vtk/rendering. I created a view based on the swtConeRenderer.java code, substituting the parent SWT composite passed to the ViewPart creation step, passing that composite to the constructor of vtkSwtComponent. It ALMOST works except that it creates a wholly new window outside the actual Eclipse view. And that view works, complete with mouse-wheel scaling. BUT, when I close that view … it crashes Eclipse, <b><i>exactly</i></b> as it does in the other demo I put together using the SWT_AWT bridge. Same message, same crash in Eclipse. Clearly, something goes horribly awry down in the bowels of the native code in SWT.</div><div><br></div><div>So I will continue to experiment with VTK but avoid anything to do with interactors. But I return to my earlier question: Am I likely to run into similar problems or is it largely or wholly in the interactors that VTK starts/handles its own event loops? So far the only problems I have seen are when interactors are involved (though my experience is rather limited, of course).</div><div><br></div><div>Thanks</div><div>Ric</div></div><div><br></div><div><br></div><span><div style="border-right:medium none;padding-right:0in;padding-left:0in;padding-top:3pt;text-align:left;font-size:11pt;border-bottom:medium none;font-family:Calibri;border-top:#b5c4df 1pt solid;padding-bottom:0in;border-left:medium none"><div><span style="font-weight:bold">From: </span> "Sebastien Jourdain-2 [via VTK]" <<a href="http://user/SendEmail.jtp?type=node&node=5722738&i=0" rel="nofollow" link="external" target="_blank">[hidden email]</a>><br></div><span style="font-weight:bold">Date: </span> Wednesday, August 14, 2013 9:53 AM<div><br><span style="font-weight:bold">To: </span> Ric Wright <<a href="http://user/SendEmail.jtp?type=node&node=5722738&i=1" rel="nofollow" link="external" target="_blank">[hidden email]</a>><br><span style="font-weight:bold">Subject: </span> Re: AWT + SWT + Event Loops (was Re: VTK6 and Java Cone Example 5)<br></div></div><div><div><br></div>
        <div dir="ltr">You need to build VTK with the SWT component ON. Moreover, <span style="font-family: arial, sans-serif; font-size: 13px; ">vtkRenderWIndowInteractor does not spawn a new event loop as VTK is NOT thread safe.</span></div></div><div><div><div class="gmail_extra"><br><br><div class="gmail_quote">On Wed, Aug 14, 2013 at 10:31 AM, rkwright <span dir="ltr"><<a href="http://user/SendEmail.jtp?type=node&node=5722733&i=0" rel="nofollow" link="external" target="_blank">[hidden email]</a>></span> wrote:<br><blockquote style='border-left:2px solid #CCCCCC;padding:0 1em' style="border-left:2px solid #CCCCCC;padding:0 1em" class="gmail_quote"><div>I have been working through the samples in the jar. The only failure so far is the vtkRenderWindowInteractor.</div><div><br></div><div>
I was not aware of a SWT component in VTK. I see a Java file vtkSwtComponent.java but it isn't clear to me that it is going to solve my problems. There are two issues I see:</div><ul><li>vtkSwtComponent appears to use the SWT OpenGL canvas widget. This is largely unsupported in SWT and was half-broken last time I looked at it. I gave up on it long ago and turned to JOGL embedding in SWT via the bridge (which works for me at present)</li><li>It's not clear how this would solve the other issue where vtkRenderWIndowInteractor spawns its own event loop and that causes problems with SWT – or does vtkRenderWIndowInteractor not use any AWT utilities or methods?</li></ul><div>I'll experiment with the vtkSwtComponent (I see one simple example file, swtConeRendering.java) and see if that helps. Though there is no SWT support in vtk.jar so I'll guess I'll have to include the SWT files directly in my project.</div><div><br></div><div>Thanks for your advice.</div><div><br></div><div>Ric</div><div><br></div><div>BTW, I am running Apple's Java 1.6.0_51-b11-457-11M4509. 64 bit</div><div><br></div><span><div style="border-right:medium none;padding-right:0in;padding-left:0in;padding-top:3pt;text-align:left;font-size:11pt;border-bottom:medium none;font-family:Calibri;border-top:#b5c4df 1pt solid;padding-bottom:0in;border-left:medium none"><span style="font-weight:bold">From: </span> "Sebastien Jourdain-2 [via VTK]" <<a href="http://user/SendEmail.jtp?type=node&node=5722724&i=0" rel="nofollow" link="external" target="_blank">[hidden email]</a>><br><span style="font-weight:bold">Date: </span> Wednesday, August 14, 2013 8:42 AM<br><span style="font-weight:bold">To: </span> Ric Wright <<a href="http://user/SendEmail.jtp?type=node&node=5722724&i=1" rel="nofollow" link="external" target="_blank">[hidden email]</a>><br><span style="font-weight:bold">Subject: </span> Re: AWT + SWT + Event Loops (was Re: VTK6 and Java Cone Example 5)<br></div><div><div><br></div>
        <div dir="ltr">Just read the sample codes that are provided in the vtk.jar or in the Source code under Wrapping/Java/vtk/sample, they should be pretty strait forward.<div>Moreover, VTK do provide a SWT component for rendering if you build it, so you shouldn't have any event loop issue...</div><div><br></div><div>Seb</div></div></div><div class="gmail_extra"><br><br><div class="gmail_quote"><div>On Wed, Aug 14, 2013 at 9:30 AM, Ric Wright <span dir="ltr"><<a href="http://user/SendEmail.jtp?type=node&node=5722710&i=0" rel="nofollow" link="external" target="_blank">[hidden email]</a>></span> wrote:<br></div><blockquote style='border-left:2px solid #CCCCCC;padding:0 1em' style="border-left:2px solid #CCCCCC;padding:0 1em" class="gmail_quote"><div style="font-size:14px;font-family:Verdana,sans-serif;word-wrap:break-word"><div><div>So did some more spelunking and it looks like this is just a basic incompatibility for SWT and AWT – in the specific case where AWT is trying to start their own event loop once SWT has started. Previously, in my other work, I handled events on my own – I didn't ask or expect AWT to start or manage it's own events. I used AWT basically to host the OpenGL canvas (based on JOGL). But when one invokes the vtkRenderWIndowInteractor an event loop IS spawned and the causes various weird problems.</div><div><br></div><div>There is a fairly long summary of some of the issues here:</div><div><br></div><div><a href="http://marc.info/?l=openjdk-awt-dev&m=135818602009136&w=2" rel="nofollow" link="external" target="_blank">http://marc.info/?l=openjdk-awt-dev&m=135818602009136&w=2</a></div><div><br></div><div>So the question that comes to my mind is how dependent is the rest of VTK on starting its own event loops? I.e. Can I use the rest of VTK and its pipeline to perform graphics, manage datasets, etc. I am willing to give up the Interactor and its mimicking of trackball if everything else is likely to work. But if spawning its own event loop(s) is intrinsic to how most of VTK works then I'm probably dead in the water.</div><div><br></div><div>Thoughts or suggestions?</div><div><br></div><div>Thanks</div><div>Ric</div><div><br></div><div><br></div></div><span><div style="border-right:medium none;padding-right:0in;padding-left:0in;padding-top:3pt;text-align:left;font-size:11pt;border-bottom:medium none;font-family:Calibri;border-top:#b5c4df 1pt solid;padding-bottom:0in;border-left:medium none"><span style="font-weight:bold">From: </span> Ric Wright <<a href="http://user/SendEmail.jtp?type=node&node=5722710&i=1" rel="nofollow" link="external" target="_blank">[hidden email]</a>><div><br><span style="font-weight:bold">Date: </span> Tuesday, August 13, 2013 12:59 PM<br></div><span style="font-weight:bold">To: </span> Sebastien Jourdain <<a href="http://user/SendEmail.jtp?type=node&node=5722710&i=2" rel="nofollow" link="external" target="_blank">[hidden email]</a>><br><span style="font-weight:bold">Cc: </span> Sean McBride <<a href="http://user/SendEmail.jtp?type=node&node=5722710&i=3" rel="nofollow" link="external" target="_blank">[hidden email]</a>>, vtkusers <<a href="http://user/SendEmail.jtp?type=node&node=5722710&i=4" rel="nofollow" link="external" target="_blank">[hidden email]</a>><div><br><span style="font-weight:bold">Subject: </span> Re: [vtkusers] VTK6 and Java Cone Example 5<br></div></div><div><br></div><div><div style="font-size:14px;font-family:Verdana,sans-serif;word-wrap:break-word"><div><div>
An update on this. I ported over some of my other Eclipse work and adapted it to VTK. It is pushed to my account on github and there is a writeup here: <a href="http://rkwright.github.io/geofx-pages/vtkview.html" rel="nofollow" link="external" target="_blank">http://rkwright.github.io/geofx-pages/vtkview.html</a>. There are 3 articles in there. The latest rev of the code is here: <a href="https://github.com/rkwright/vtkscene" rel="nofollow" link="external" target="_blank">https://github.com/rkwright/vtkscene</a> in the develop branch.</div><div><br></div><div>Mostly, it works great. However, when I tried the fifth cone example, which has the problematic vtkRenderWindowInteractor, I ran into similar problems as before. I instantiated it with a valid vtkPanel.RenderWindow but it still goes off into the ozone, sometimes crashing the native vtkOpenGL dylib.</div><div><br></div><div>I'm going to skip the interactor for now and move on to see if I run into more problems. If not, I can probably live without that widget but the problems there might be symptomatic of deeper problems on OSX 64 bit systems.</div><div><br></div><div>Any further suggestions would be welcome.</div><div><br></div><div>Thanks</div><div>Ric</div><div><br></div><div><br></div></div><span><div style="border-right:medium none;padding-right:0in;padding-left:0in;padding-top:3pt;text-align:left;font-size:11pt;border-bottom:medium none;font-family:Calibri;border-top:#b5c4df 1pt solid;padding-bottom:0in;border-left:medium none"><span style="font-weight:bold">From: </span> Sebastien Jourdain <<a href="http://user/SendEmail.jtp?type=node&node=5722710&i=5" rel="nofollow" link="external" target="_blank">[hidden email]</a>><div><br><span style="font-weight:bold">Date: </span> Tuesday, August 6, 2013 8:56 AM<br></div><span style="font-weight:bold">To: </span> Ric Wright <<a href="http://user/SendEmail.jtp?type=node&node=5722710&i=6" rel="nofollow" link="external" target="_blank">[hidden email]</a>><br><span style="font-weight:bold">Cc: </span> Sean McBride <<a href="http://user/SendEmail.jtp?type=node&node=5722710&i=7" rel="nofollow" link="external" target="_blank">[hidden email]</a>>, vtkusers <<a href="http://user/SendEmail.jtp?type=node&node=5722710&i=8" rel="nofollow" link="external" target="_blank">[hidden email]</a>><div><br><span style="font-weight:bold">Subject: </span> Re: [vtkusers] VTK6 and Java Cone Example 5<br></div></div><div><div><br></div><div dir="ltr">In Java you should use the Java specific classes anyway like vtkPanel/vtkCanvas or the new version of them used in the vtk.sample package of the vtk.jar...<div><br></div><div>The purpose of those example was to show the possible match between the different languages... </div><div><br></div><div>Nothing more I believe,</div><div><br></div><div>Seb</div></div></div><div class="gmail_extra"><br><br><div class="gmail_quote"><div>On Tue, Aug 6, 2013 at 8:52 AM, Ric Wright <span dir="ltr"><<a href="http://user/SendEmail.jtp?type=node&node=5722710&i=9" rel="nofollow" link="external" target="_blank">[hidden email]</a>></span> wrote:<br></div><blockquote style='border-left:2px solid #CCCCCC;padding:0 1em' style="border-left:2px solid #CCCCCC;padding:0 1em" class="gmail_quote"><div>
Ah, OK. Well, I don't know what to do here. Is this happening to others?<br>
Should I file a bug? Just try to work around it by not using<br>
RenderWindowInteractors (sounds kind of lame). Or?<br><br>
Suggestions?<br><br>
Thanks<br><span><font color="#888888">Ric<br></font></span></div><div><div><div><br><br>
On 8/5/13 4:15 PM, "Sean McBride" <<a href="http://user/SendEmail.jtp?type=node&node=5722710&i=10" rel="nofollow" link="external" target="_blank">[hidden email]</a>> wrote:<br><br>
>On Mon, 5 Aug 2013 16:10:55 -0500, Ric Wright said:<br>
><br>
>>Well, a little playing around didn't seem to help, but I am frankly not<br>
>>an<br>
>>expert on threads. However, it seems to me that the source of the<br>
>>problem<br>
>>is that the vtkRenderWindowInteractor gets initialized then the start()<br>
>>method creates an event loop that is monitored by the<br>
>>vtkRenderWindowInteractor. I suspect that start() method spawns a new<br>
>>thread to listen to the events and it is the spawning of that thread that<br>
>>causes the exception.<br>
><br>
>VTK's Cocoa classes never create any threads.<br>
><br>
>Cheers,<br>
><br>
>--<br>
>____________________________________________________________<br></div>
>Sean McBride, B. Eng <a href="http://user/SendEmail.jtp?type=node&node=5722710&i=11" rel="nofollow" link="external" target="_blank">[hidden email]</a><div><br>
>Rogue Research <a href="http://www.rogue-research.com" rel="nofollow" link="external" target="_blank">www.rogue-research.com</a><br>
>Mac Software Developer Montréal, Québec, Canada<br>
><br>
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