[osg-users] animation in SceneView vs. Viewer??

[Abe Stephens]

I resolved this issue by calling OpenThreads::Thread::Init() during
program initialization (not sure why the glut example didn't need to do
this). My application is now successfully using
setUpViewerAsEmbeddedInWindow in combination with wxpython using a
rather modified version of Hartmut Seichter's osgBindings swig package.

Thanks-
Abe

Abe Stephens wrote:
> Thanks, I appreciate the help. osgViewer::Viewer produces a segfault in
> libOpenThreads:
>
>     #0  0xb5dc577d in OpenThreads::Thread::setProcessorAffinity
>     (this=0x80d1d78, cpunum=0)
>         at
>     /local/abe/build-piglet/package/OpenSceneGraph/src/OpenThreads/pthreads/PThread.c++:505
>     #1  0xb5dc589c in OpenThreads::SetProcessorAffinityOfCurrentThread
>     (cpunum=0)
>         at
>     /local/abe/build-piglet/package/OpenSceneGraph/src/OpenThreads/pthreads/PThread.c++:922
>     #2  0xb4370771 in osgViewer::Viewer::setUpThreading (this=0x88ef878)
>     at
>     /local/abe/build-piglet/package/OpenSceneGraph/src/osgViewer/Viewer.cpp:898
>     #3  0xb4370e16 in osgViewer::Viewer::realize (this=0x88ef878) at
>     /local/abe/build-piglet/package/OpenSceneGraph/src/osgViewer/Viewer.cpp:1794
>     #4  0xb4dada46 in _wrap_Viewer_realize (args=0x87eec4c) at
>     /local/abe/build-piglet/package/osgBindings/build-gcc/src/osgViewerPYTHON_wrap.cxx:10607
>
> Further inspection of the call stack revealed that when executed via
> glut Thread::CurrentThread() on line 919 of PThread.c++ returns zero
> while when executed in the wx program returns a bogus pointer.
>
> The function is invoked as:
>
>     self.viewer = osgViewer.Viewer()
>     pos = self.GetRect();
>     self.viewer.setUpViewerAsEmbeddedInWindow( pos.x, pos.y, pos.width,
>     pos.height )
>     self.viewer.setThreadingModel(osgViewer.Viewer.SingleThreaded)       
>     self.viewer.realize() # Causes segfault above.
>
> Do you have any idea why this might be the case? I appreciate that this
> problem is likely related to an interaction with python, but any advice
> would be appreciated.
>
> -Thanks
> Abe
>
> Robert Osfield wrote:
>   
>> Hi Abe,
>>
>> I don't know what might be up given your code fragment. SceneView is
>> lower level that osgViewer::Viewer, so does require more care with
>> setup, and its less powerful....
>>
>> Personally I wouldn't recommend using SceneView in your own code, just
>> use osgViewer::Viewer and its embedded mode if you need to integrate
>> with an existing window.   It's a waste of our time to struggle on
>> trying to get SceneView do things that Viewer already does out of the
>> box perfectly.
>>
>> Robert.
>>
>> On 8/30/07, Abe Stephens <abe at sci.utah.edu> wrote:
>>   
>>     
>>> Hi, I'm attempting to load an animated .osg scene exported from blender
>>> into an existing application with minimal fuss. The existing application
>>> has a basic glut front end and a more useful wxpython front end. I'm
>>> having trouble getting animation to work properly:
>>>
>>> In the glut application using osgViewer::Viewer animation works when
>>> I call:
>>>
>>>      viewer->advance()
>>>      viewer->updateTraversal()
>>>      viewer->renderingTraversal()
>>>
>>> However in the wxpython application, using osgUtil::SceneView animation
>>> does not work. I am calling:
>>>
>>>      frameStamp = osg.FrameStamp()
>>>      time =
>>>      osg.Timer.instance().delta_s(self.start_tick,osg.Timer.instance
>>> ().tick())
>>>      frameStamp.setReferenceTime(time)
>>>      frameStamp.setSimulationTime(time)
>>>      frameStamp.setFrameNumber(self.framecounter)
>>>      self.framecounter += 1
>>>
>>>      self.sceneviewer.setFrameStamp( frameStamp )
>>>      self.sceneviewer.update()
>>>      self.sceneviewer.cull()
>>>      self.sceneviewer.draw()
>>>
>>> I noticed that unlike osgViewer::Viewer, SceneView::update() does not
>>> appear to apply the update visitor to the scene data, only to the
>>> camera.
>>>
>>> Any idea what I am doing wrong?
>>>
>>> Thanks-
>>> Abe
>>>
>>>
>>>
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>>>
>>>     
>>>       
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>
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