[osg-users] [Toward BufferObject serialization] Geometry serializer FinishedObjectReadCallback???

[Julien Valentin]

Searching posts at this period -oct 2010- i found this post 
http://forum.openscenegraph.org/viewtopic.php?t=6826
does it recall anything? 


robertosfield wrote:
> Hi Julian,
> 
> Thanks for tracking down the commit.  I did a quick search for related
> discussions on osg-users but haven't spotted anything around the right
> time frame (late October 2010).  There is probably something in
> osg-submissions and osg-users that discusses this as I don't think
> it'll be something that I would have applied without some wider issue
> discussion.
> 
> Robert.
> 
> On 23 May 2016 at 11:15, Julien Valentin <> wrote:
> 
> > Thanks Robert
> > 
> > According to the git log:
> > 
> > 
> > > commit 57a0065d08b3aa5b06da54a7b78ea2ae36cb2c9a
> > > Author: Robert OSFIELD <>
> > > Date:   Thu Oct 28 14:04:57 2010 +0000
> > > 
> > > Added use ObjectWrapper's FinishObjectReadCallback to fix VertexBufferObject  handling in osg::Geometry
> > > and a call to the TileLoaded callback in osgTerrain.
> > > 
> > > 
> > > 
> > 
> > 
> > But -and perhaps I haven't investigated enough- I still don't understand what problem with VertexBufferObject it fixed...
> > 
> > 
> > 
> > robertosfield wrote:
> > 
> > > Hi Julian,
> > > 
> > > I have a vague recollection that this callback had to be used to force
> > > the VBO to be built or something along those lines.  Off the top of my
> > > head I don't recall the exact problem that instigated the change and
> > > the contributor that came up with this solution.  Perhaps git log for
> > > the files in question might help piece together why it's done.
> > > 
> > > Robert.
> > > 
> > > On 20 May 2016 at 17:35, Julien Valentin <> wrote:
> > > 
> > > 
> > > > Hi,all
> > > > I would like to provide osg TransformFeedback serialization feature but something weird forbid BufferObject serialization:
> > > > This callback calls setUseVertexBufferObjects(false) and just kill all BufferObject attached the geometry's BufferDatas
> > > > 
> > > > 
> > > > Code:
> > > > struct GeometryFinishedObjectReadCallback : public osgDB::FinishedObjectReadCallback
> > > > {
> > > > virtual void objectRead(osgDB::InputStream&, osg::Object& obj)
> > > > {
> > > > osg::Geometry& geometry = static_cast<osg::Geometry&>(obj);
> > > > if (geometry.getUseVertexBufferObjects())
> > > > {
> > > > geometry.setUseVertexBufferObjects(false);
> > > > geometry.setUseVertexBufferObjects(true);
> > > > }
> > > > }
> > > > };
> > > > 
> > > > 
> > > > I don't understand the utility of this callback (surely because I want to remove it:) )
> > > > Does anyone know its purpose?
> > > > 
> > > > Thank you!
> > > > 
> > > > Cheers,
> > > > Julien
> > > > 
> > > > ------------------
> > > > Read this topic online here:
> > > > http://forum.openscenegraph.org/viewtopic.php?p=67181#67181
> > > > 
> > > > 
> > > > 
> > > > 
> > > > 
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> > > > 
> > > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
> > > > 
> > > > 
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Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=67206#67206