[osg-users] osgDotNet : Nodes adding to scene graphoutsidemain()function scope

Mike Wittman mwittman at seismicmicro.com
Tue Sep 25 08:26:08 PDT 2007

Hi Christophe,


The dependency on camera position is an interesting and potentially important insight.  There may be some location-related conditional behavior within the native code that osgDotNet is not handling properly.


Can you tell me generally what is contained in the scene graphs of the models that you are loading?  That may have some bearing on the problem.





From: osg-users-bounces at lists.openscenegraph.org [mailto:osg-users-bounces at lists.openscenegraph.org] On Behalf Of Christophe Medard
Sent: Tuesday, September 25, 2007 9:43 AM
To: OpenSceneGraph Users
Subject: Re: [osg-users] osgDotNet : Nodes adding to scene graphoutsidemain()function scope


Hi Mike,


Thanks for telling me the same kind of thing was already reported ! 

I understand passin in OSG 2.1.12 would do no good.


Thanks also for confirming the OSG reference count management being done by the wrapper layer in a .NET Managed-fashion...


It's quite hard to find the root cause indeed, since it seems to depend on independant factor, like where the camera is -initially- positionned : I only get the problem when letting osgViewer set it away from the scene (no osgViewer.getCameraManipulator().setHomePosition() call in my mainloop). There's something about an intersect visitor apparently (a culling pass ?).

One could think it's only where the AccessViolation first occur. I'm not sure : if I initialize the camera close to the scene geometry, not only does my AccessViolation vanish, but I don't have the OSG Notice warning about a possible problem anymore either. That whether I leave space between my point of the scene and scene geometry through manipulator's behaviour afterwards in the run time of my application...


Anyway, if anyone happen to lock the root cause, please don't hesitate to post !


Christophe Médard
Société OKTAL (http://www.oktal.fr)
2 impasse Boudeville
31100 Toulouse (France)
Tél. : (+33) 5 62 11 50 10
Fax : (+33) 5 62 11 50 29


	----- Original Message ----- 

	From: Mike Wittman <mailto:mwittman at seismicmicro.com>  

	To: OpenSceneGraph Users <mailto:osg-users at lists.openscenegraph.org>  

	Sent: Tuesday, September 25, 2007 3:58 PM

	Subject: Re: [osg-users] osgDotNet : Nodes adding to scene graph outsidemain()function scope


	Hi Christophe,


	This sounds like a bug that Jason reported where a particle system under a PAT node gives the same symptoms - http://www.openscenegraph.org/projects/osgDotNet/ticket/1.  I've dug into that problem some, but only enough to know that it will take quite a bit more time to track down the root cause.


	You're correct about the reference count management; it's intended to be completely handled by the wrappers and transparent to the C# user.  Obviously something is going wrong in this particular case.


	Mike Wittman

	mwittman at seismicmicro.com <mailto:mwittman at seismicmicro.com> 


	Seismic Micro-Technology, Inc.

	8584 Katy Freeway, Suite 400 / Houston, Texas 77024

	Tel.  +1 (713) 464-6188

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	Web:  www.seismicmicro.com <blocked::blocked::http://www.seismicmicro.com> 


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