[vtkusers] vtk 5.10.1, vtkCanvas, SWT/AWT : app hangs when vtkorientationmarkerwidget/vtkaxesactor added and/or gradient background enabled

Thu Jun 13 12:17:56 EDT 2013

I don't know exactly how your code is structured, but I would think there
is a better way.
Never the less, I'm not fully confident to know what the issue is...

So I let you figure things out...

Seb

On Thu, Jun 13, 2013 at 11:39 AM, Gerrick Bivins <
Gerrick.Bivins at halliburton.com> wrote:

>  Yes, found that just didn’t know where to check it!****
>
> Right now I create a vtkCanvas and add an observer for the “EndEvent” of
> the  vtkRenderWindow. ****
>
> In there I check “isWindowSet” and some others on the interactor.****
>
> If all is good, do the initial setup of the renderer and then remove the
> observer.****
>
> Is this a bad idea? By bad, I mean unreliable.****
>
> ** **
>
> *From:* Sebastien Jourdain [mailto:sebastien.jourdain at kitware.com]
> *Sent:* Thursday, June 13, 2013 10:16 AM
>
> *To:* Gerrick Bivins
> *Cc:* vtkusers at vtk.org
> *Subject:* Re: [vtkusers] vtk 5.10.1, vtkCanvas, SWT/AWT : app hangs when
> vtkorientationmarkerwidget/vtkaxesactor added and/or gradient background
> enabled****
>
> ** **
>
> I didn't see anything in vtkCanvas but the value to check for is:****
>
> ** **
>
> vtk.vtkCanvas: N/A****
>
> vtk.vtkPanel: isWindowSet()****
>
> vtk.rendering.awt.vtkAwtComponent: isWindowSet()****
>
> ** **
>
> Seb****
>
> ** **
>
> On Thu, Jun 13, 2013 at 9:32 AM, Gerrick Bivins <
> Gerrick.Bivins at halliburton.com> wrote:****
>
> I went to implement this and was expecting to hook to an event/command to
> get notification of the vtkRenderWindowInteractor****
>
> state change (Initialized,Started) but there don’t seem to be any. In
> fact, there aren’t many notifications of state changes to the interactor or
> the vtkRenderWindow.****
>
> Have I overlooked something?  ****
>
>  ****
>
> *From:* Sebastien Jourdain [mailto:sebastien.jourdain at kitware.com]
> *Sent:* Wednesday, June 12, 2013 2:58 PM
> *To:* Gerrick Bivins
> *Cc:* vtkusers at vtk.org
> *Subject:* Re: [vtkusers] vtk 5.10.1, vtkCanvas, SWT/AWT : app hangs when
> vtkorientationmarkerwidget/vtkaxesactor added and/or gradient background
> enabled****
>
>  ****
>
> Hi Gerrick,****
>
>  ****
>
> I don't know which version of VTK you are using, but if you are using the
> latest release (still in RC),****
>
> you have a proper SWT renderering component that may work slightly better.
> ****
>
>  ****
>
> Although, one thing that could be the issue here is that some of the
> methods that you call (the one that dead lock) internally generate the
> render window while that one is not visible in the Java/SWT context.****
>
> What I'm saying is you may need to do your setup in 2 steps. First step,
> setup the UI container and then 'later', once the graphical component is
> visible, intialize the VTK renderer the way you want.****
>
>  ****
>
> Seb****
>
>  ****
>
> On Wed, Jun 12, 2013 at 12:21 PM, Gerrick Bivins <
> Gerrick.Bivins at halliburton.com> wrote:****
>
> Hi All,****
>
> I have an application that embeds an AWT canvas, vtkCanvas, in an SWT
> Composite using the SWT_AWT bridge. ****
>
> The issue I’m having has only shown itself on one machine but the symptoms
> are really strange.****
>
> Basically, if I follow all the rules about creating actors, modifying the
> pipeline etc as described here:****
>
>
> http://www.vtk.org/Wiki/VTK/Java_Wrapping#Threading_Sample_Code_.28from_VTK.2FWrapping.2FJava.2Fvtk.2Fsample.2FDemo.java.29
> ****
>
>  ****
>
> it’s all gravy.****
>
>  ****
>
> However, on a particular machine I have two issues:****
>
> 1)      if I turn on a gradient background as described here:****
>
> http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/BackgroundGradient*
> ***
>
> the app locks up. I enable it by calling
> vtkRenderer.GradientBackgroundOn()  so I’m not sure if I can****
>
> make this call in a java application and where it’s valid to do so because
> the native code is****
>
> doing more than just setting the “GradientBackground” variable. ****
>
> 2)      Similar but different, if I add a vtkAxesActor to the renderer,
> it cannot be enabled until some time later. Ambiguous, I know!!!****
>
> Basically, if I set up the code similar to this example:****
>
>
> http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/DisplayCoordinateAxes
> ****
>
> the calls to widget.SetEnabled(1) causes the application to hang. If I set
> it to widget.SetEnabled(0)****
>
>                and then sometime later (not sure the condition here for
> what is “later”)toggle it on. It works as expected.****
>
>  ****
>
> Everything is setup to check for the EDT and execute properly on the EDT
> or invokeLater on the EDT so it doesn’t seem like that’s the issue.****
>
> As I’ve stated earlier, this setup works on most machines but we ran into
> a case where, it fails. ****
>
> What I’ve noticed when it hangs is that there are two AWT Event threads(0
> and 1) and it looks like a window pops up external to the SWT composite.**
> **
>
> Then it tries to pull (or create another one) and put it in the composite.
> On the 4 or 5 machines we internally tested on****
>
> it wasn’t noticeable and succeeded but on the failing machine, it was more
> obvious and seem to freeze here.****
>
>  ****
>
> Long post, but if anyone has any advice here, it would be greatly
> appreciated. One confusing thing is that I don’t know when the****
>
> vtkRenderwindowinteractor methods are triggered (Start,Initialize) .It’s
> “state” at any time is confusing to me when going through the
> vtkCanvas/vtkPanel****
>
> Java layer.****
>
>  ****
>
> Gerrick****
>
>  ****
>
>  ****
>
>  ****
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