HI Boon Wah, The Geometry mesh in both instances should be identical and should perform the same. The only thing different in the scene graph will be the Texture objects. To verify this simply use osgconv to convert the same tile from each database to a .osgt and then compare the contents.
As for your measure performance difference, it's an oddity for sure. Either suggests that databases were created differently beyond the texturing, or something went astray in the benchmarking you've done. I guess another possibility could be that the GL driver/hardware doesn't support S3 compression and has to emulate. Robert, On 20 January 2014 15:24, Boon Wah <[email protected]> wrote: > Hi, > > I had compiled two IVE using osgDEM. One was generated with the > default S3 compression and the other was using no compression (--RGB24 > flag). > > It appears that during texture loading the no compression database > loaded slower than the S3 database, which is the case. > > However, when I profiled my code, I realised there is a large time > difference when it comes to osg::Geometry::drawImplementation and more > specifically at osg::Primitive::drawImplementation. The S3 database was > about 3x slower. > > Can somebody please explain me why is this so? > > Thank you! > > Kind Regards, > Boon Wah > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=57927#57927 > > > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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