Hi Alessandro, In 2.2 it might of been that the max number of contexts required wasn't being reset by the viewer, this in turn would have had an impact on how the scene graph would have handled unref'ing of imagery as its download to the graphics card.
The growth in memory does sounds kinda extreme, without seeing the model first hand I could really speculate and what it exactly it might be. Non power of two textures, by default, will be rescaled, but this is done in the fly as the data is downloaded so shouldn't affect memory consumption too much. You can tell the OSG not to rescale non power of texture is by doing texture->setResizeNonPowerOfTwoHint(false); on all the textures in the scene graph. This will keep memory down a bit. BTW, you will always get large memory usage in memory vs model size as most imagery is stored compressed, and once you download data you typically end up with two copies of the data, one in app memory, and one managed by the OpenGl driver. Robert. On Sat, Jan 10, 2009 at 10:41 AM, alessandro terenzi <[email protected]> wrote: > Dealing with collada files I noticed a problem: > > OSG 2.2.0: if I load a 20 MB model ( geometry+textures) with osgviewer, the > memory usage grows up to 700/800 MB and does not decrease until program > termination. > > OSG 2.6.0: if I load the same model, the memory usage reachs 700/800 MB too, > but when the model is displayed the memory used is just 60/70 MB. > > I must state that the model has a huge quantity of not-power of 2 textures, > and rescaling occurs. > > My questions: is this difference (from version 2.2 to 2.6) in the collada > plugin itself or in OSG's core? What is the reason for such a different > behaviour? > > Thank you. > Alessandro > _______________________________________________ > 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
