HI Alessandro, If you want to set the max texture size you do it via the osg::DisplaySettings, this is the class that reads the OSG_MAX_TEXTURE_SIZE env var and is querred by the texture class. Before you load your data and run your viewer do:
osg:DisplaySettings::instance()->setMaxTextureSize(size); Robert. On Sat, Jan 10, 2009 at 7:11 PM, alessandro terenzi <[email protected]> wrote: > Thank you Robert, that was exactly what I was looking for. > Looking at the source, I noticed that one can avoid using the > OSG_MAX_TEXTURE_SIZE environment variable by calling the method: > > osg::Texture::Extensions::setMaxTextureSize(.) > > in order to call it, I need for example a Texture2D object and then call its > getExtensions(.) method, I just not sure about what parameters I'm supposed > to pass, so I tried this: > > osg::Texture2D::Extensions* extension = texture->getExtensions(0, true); > > if(extensions) > extension->setMaxTextureSize(64); > > (having set to 'true' the second parameter, everything works fine...) but I > wonder: what value should be passed for the 1st parameter? 0, works, but it > was just a try... > > Thank you again. > Alessandro > > On Sat, Jan 10, 2009 at 5:06 PM, Robert Osfield <[email protected]> > wrote: >> >> Hi Alessandro, >> >> You can set the OSG_MAX_TEXTURE_SIZE env var to the max size you want, >> this will force a rescale of all imagery larger than this when it's >> download to OpenGL. This is slow to keep doing at runtime though, the >> best thing would be to write a pre-processing traversal that rescales >> all the imagery to a sensible size then save out. Another thing you >> do is to use OpenGL texture compression to help reduce memory >> footprint down on the GPU and in main memory. Again converting your >> data once then use this processed model at runtime is the most >> efficient things to do. You can use osgconv to help out with this. >> >> Robert. >> >> On Sat, Jan 10, 2009 at 10:53 AM, alessandro terenzi >> <[email protected]> wrote: >> > Experiencing with models prepared by people that do not develop graphics >> > for >> > realtime applications, it happens quite often that we have to deal with >> > models that come with not-power of 2 and/or very big textures. >> > >> > This took me to face with 2 problems: >> > >> > 1) if rescaling to power of 2 occurs, performances may be not as >> > desired >> > 2) memory usage could be very high if many big textures are used >> > >> > I wonder if there is a way/hint to force OSG to rescale every texture to >> > a >> > chosen max dimension? >> > >> > 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 > > > _______________________________________________ > 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
