Hi John, As others have pointed out, what you are seeing is the removal of expired subgraphs. The DatabasePager is built around continuous update of the scene graph - both for loading of new subgraphs, compiling of subgraphs, merging of subgraphs and removal of expired subgraphs. As such paging databases aren't appropriate to non continuous updated apps, you could fudge things by upping the expiry delay on the DatabasePager. Doing periodic renders of the scene would also allow things to tick along.
Robert. On Wed, Jul 30, 2008 at 1:39 PM, John Vidar Larring <[EMAIL PROTECTED]> wrote: > Hi all, > > Background: > ----------- > In our application the user can set up scenes ( or sequences as we call > them) for playback on a timeline (e.g. seq.1 - transition - seg.2 - > transition ... seq.N). Some scenes are too complex to render real-time and > are recorded to movies before playback. Hence, when scenes are edited by the > user all scenes are redrawn as needed rather than continuously to avoid > sluggish GUI response. > > Problem: > -------- > _Sometimes_ when the scene is redrawn in edit mode (i.e. redraw only if > needed), the pagedLOD DB (osgTerrain) drops to the lowest detail level (Ref. > osg_original.jpg and osg_problem.jpg). This behavior seems to appear at > randomly. In playback mode (i.e. when frame rate is constant) the problem > never occurs. > > Reproduce / Code example: > ---------- > The problem has been reproduces in a small test program > (osgtest_source_code.tgz) derived from the osgviewerQT example (since we are > using Qt 4.x in our application). To reproduce: run the compiled > application: 'osgtest -t <your osgTerrain db>' . To trigger refreshes, > occlude parts of the window with another window. The problem typically > reveals itself when at a redraw or when the window looses focus (be patient, > since this happens randomly it may take some time before the problem > occurs). > > Since I'm still quite new to OSG, I'm not sure where to look for a solution. > Hopefully someone will spot the obvious error in the sample code. Any advice > is highly appreciated. > > Versions: > --------- > OSG svn rev 8700 > Qt 4.2.3 > > Best regards, > John Larring > > -- > This message has been scanned for viruses and > dangerous content by MailScanner, and is > believed to be clean. > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
