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

Christophe Medard christophe.medard at oktal.fr
Tue Sep 25 07:43:21 PDT 2007

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 
  To: OpenSceneGraph Users 
  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


  Seismic Micro-Technology, Inc.

  8584 Katy Freeway, Suite 400 / Houston, Texas 77024

  Tel.  +1 (713) 464-6188

  Fax. +1 (713) 464-6440

  Web:  www.seismicmicro.com


  CONTACT US TODAY for more information.

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