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

[Robert Osfield]

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 <julienvalentin51 at gmail.com> 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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>> >
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> ------------------
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=67204#67204
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