Robert, I think your proposal would be a great benefit and would make things more flexible.
For the record, the cards we're using are Nvidia GeForce 295s so they're fairly good cards. I would assume the drivers are as good but I don't know what algorithms they're resorting to for filtering on the texture... Thanks, -Shayne -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Robert Osfield Sent: Wednesday, January 27, 2010 2:09 AM To: OpenSceneGraph Users Subject: Re: [osg-users] altering terrain texture... Hi Shayne, On Tue, Jan 26, 2010 at 6:42 PM, Tueller, Shayne R Civ USAF AFMC 519 SMXS/MXDEC <[email protected]> wrote: > Robert, > > In answer to your inquiry, I'm using a database based on > osgTerrain::TerrainTile so the texture settings are embedded in the tiles as > you asserted earlier. I wasn't planning on using linear filtering. I was > just giving it as an example on how I wanted to issue a particular call > programmatically. > > Rather than attempt to tweak the texture settings per your suggestions, I > was able to change the settings on the graphics card to get what I wanted > thereby overriding the settings in the database. With anisotropic filtering > in the database set at 16x, it was actually adding to the problem of texture > crawling at far distances when flying "low". Setting the anisotropic > filtering down to 2x blurred the texture a bit more out far but it got rid > of the crawling artifacts. We are using high resolution texture imagery > (.25m texture) in the database which exacerbates the problem. > > In this case, the devil is truly in the details. Thanks again for your > help... Interesting results, makes me wonder if the mipmap quality of filtering quality of the driver isn't that great. I have generally got best results with a high value of max anisotropy. As for the OSG, perhaps it's time to make the max anisotropy a variable in osgTerrain::Layer so that you can set in your application. The DatabasePager variable for setting could also be then used to set the value automatically. Robert. _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
smime.p7s
Description: S/MIME cryptographic signature
_______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
