[osg-users] PagedLOD and page in/out detection

[Robert Osfield]

Hi Nick,

There isn't a feature directly built into osg::PageLOD or
DatabasePager for this.

What you could do is look at the  creating a custom DatabasePager that
overrides the following method:

       /** Merge the changes to the scene graph by calling calling
removeExpiredSubgraphs then addLoadedDataToSceneGraph.
          * Note, must only be called from single thread update phase. */
        virtual void updateSceneGraph(const osg::FrameStamp& frameStamp);

Within this you could add your own tracking of when things are merge or removed.

Robert.



On 3 June 2016 at 17:15, Trajce Nikolov NICK
<trajce.nikolov.nick at gmail.com> wrote:
> Hi Community,
>
> I was looking for a way to detect when PagedLOD gets its children paged
> in/out. So I installed an update callback and based on a difference in the
> children number I was able to know when such change occurred. And this was
> working with a code an year ago.
>
> Now it doesn't .. Any clue or hint how to detect such changes?
>
> Thanks a bunch as always!
>
> Cheers,
> Nick
>
> --
> trajce nikolov nick
>
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