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<p class="MsoNormal">Hi All,<o:p></o:p></p>
<p class="MsoNormal">I have an application that embeds an AWT canvas, vtkCanvas, in an SWT Composite using the SWT_AWT bridge.
<o:p></o:p></p>
<p class="MsoNormal">The issue I’m having has only shown itself on one machine but the symptoms are really strange.<o:p></o:p></p>
<p class="MsoNormal">Basically, if I follow all the rules about creating actors, modifying the pipeline etc as described here:<o:p></o:p></p>
<p class="MsoNormal"><a href="http://www.vtk.org/Wiki/VTK/Java_Wrapping#Threading_Sample_Code_.28from_VTK.2FWrapping.2FJava.2Fvtk.2Fsample.2FDemo.java.29">http://www.vtk.org/Wiki/VTK/Java_Wrapping#Threading_Sample_Code_.28from_VTK.2FWrapping.2FJava.2Fvtk.2Fsample.2FDemo.java.29</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">it’s all gravy.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">However, on a particular machine I have two issues:<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">1)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>if I turn on a gradient background as described here:<o:p></o:p></p>
<p class="MsoListParagraph"><a href="http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/BackgroundGradient">http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/BackgroundGradient</a><o:p></o:p></p>
<p class="MsoListParagraph">the app locks up. I enable it by calling vtkRenderer.GradientBackgroundOn() so I’m not sure if I can<o:p></o:p></p>
<p class="MsoListParagraph">make this call in a java application and where it’s valid to do so because the native code is<o:p></o:p></p>
<p class="MsoListParagraph">doing more than just setting the “GradientBackground” variable.
<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">2)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Similar but different, if I add a vtkAxesActor to the renderer, it cannot be enabled until some time later. Ambiguous, I know!!!<o:p></o:p></p>
<p class="MsoListParagraph">Basically, if I set up the code similar to this example:<o:p></o:p></p>
<p class="MsoListParagraph"><a href="http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/DisplayCoordinateAxes">http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/DisplayCoordinateAxes</a><o:p></o:p></p>
<p class="MsoListParagraph">the calls to widget.SetEnabled(1) causes the application to hang. If I set it to widget.SetEnabled(0)<o:p></o:p></p>
<p class="MsoNormal"> and then sometime later (not sure the condition here for what is “later”)toggle it on. It works as expected.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">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.<o:p></o:p></p>
<p class="MsoNormal">As I’ve stated earlier, this setup works on most machines but we ran into a case where, it fails.
<o:p></o:p></p>
<p class="MsoNormal">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.<o:p></o:p></p>
<p class="MsoNormal">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<o:p></o:p></p>
<p class="MsoNormal">it wasn’t noticeable and succeeded but on the failing machine, it was more obvious and seem to freeze here.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">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<o:p></o:p></p>
<p class="MsoNormal">vtkRenderwindowinteractor methods are triggered (Start,Initialize) .It’s “state” at any time is confusing to me when going through the vtkCanvas/vtkPanel<o:p></o:p></p>
<p class="MsoNormal">Java layer.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Gerrick<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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