-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Curtis Olson wrote: > On Jan 7, 2008 9:24 AM, Tim Moore <[EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]>> wrote: > > If you are going to enable random objects, I recommend using OSG 2.3 > or later. Otherwise, > set the environment variable OSG_DATABASE_PAGER_DRAWABLE=VertexArrays > > > Hi Tim, > > Is there a way to work around this in our code? Right now OSG 2.2 is > the most recent "stable" release and until they hit 2.4, this is going > to quickly turn into a FAQ for us. > This policy can be set from C++ code, and perhaps it should be set if using an older OSG version than 2.3. I didn't think it was really necessary before, but random objects are another story.
> Just for my own interest/understanding, can you give a brief explanation > of the problem? I'd love to start understanding OSG better. OSG compiles geometry into OpenGL display lists. This action needs a graphics context, which means doing it in the graphics thread for all practical purposes. To avoid impacting the frame rate when new scenery is paged in, the OSG DatabasePager passes several objects per frame to the graphics thread for compilation. Unfortunately there are bugs in 2.2 that cause shared models, such as the scenery models and random objects, to be recompiled for each instance of the model. This is mostly noticeable in fg at startup when the whole world is paged in, but the large number of random objects (thousands) really tickles this bug. I submitted fixes for OSG which are in 2.3. The "OSG_DATABASE_PAGER_DRAWABLE=VertexArrays" forces OSG to not use display lists; this solves the problem at the cost of lower overall performance. I suppose that we shouldn't expect users of CVS FlightGear to track OpenSceneGraph from SVN. OSG 2.3.1 is available as a tarball; I don't know if it's available as a binary download. Tim -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iD8DBQFHglc/eDhWHdXrDRURAuvAAJ9It+EQDcKi1YUaE8Kg5aJUcUp54wCfS5qp p/dUPERnPlcE2NO2wI9okzk= =kqZV -----END PGP SIGNATURE----- ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Flightgear-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/flightgear-devel
