HI Renzil, osgdem doesn't support what you want to do, it's never been intended to be used this way so I'm afraid you are one your own.
Robert. On Thu, May 22, 2008 at 10:48 AM, renzil d'souza <[EMAIL PROTECTED]> wrote: > > Hi > > I'm writing a plug-in that is able to generate terrain on the fly on the GPU, > which works with the paged-LOD system provided by osg. For it to work, I need > my DEMs in their original raster formats (like tif), and I also need my DEMs > to be 'subtiled' similar to how the textures are currently subtiled. My DEM > geometry/terrain-tile data is no longer generated through osgdem but is > instead generated on the fly from these subtiles (depending on distance from > viewpoint). I need various resolutions of the DEM data in order to do this. > My idea was that, since the DEMs are also images with a single color value > per pixel (representing height), I could pass these DEMs as textures with the > -t option and it would output a set of dds files which contain my DEM data at > various resolutions. The co-ordinate system info and any other > transformations to be applied on these dds files I would store in my scene > graph which I output to the filesystem, but I wouldn't store the geometry > itself. > > When I try to do "osgdem -t " it is giving me a set of dds subtiles, but when > viewing them in osgviewer they are totally white, which means none of the > height data is stored in these dds files. How can I achieve this ? > > Again, thanks for your time. > > Renzil > >> Date: Thu, 22 May 2008 09:00:08 +0100 >> From: "Robert Osfield" >> Subject: Re: [osg-users] How to subtile DEMs ? >> To: "OpenSceneGraph Users" >> Message-ID: >> >> Content-Type: text/plain; charset=ISO-8859-1 >> >> Hi Renzil, >> >> I don't really understand what you mean. The database built by osgdem >> doesn't contain any DEMs, it's either just polygonal based or using >> osgTerrain::TerrainTile if you use the --terrain option. osgdem >> builds the geometry data based on the DEMs it loads, but once the >> geometry is created the DEM data is just deallocated as there is no >> further use for it. >> >> Robert. >> >> On Wed, May 21, 2008 at 11:13 PM, renzil d'souza wrote: >>> >>> Hi >>> >>> Currently osgdem (vpb-0.9.7) in paged-LOD mode generates various subtiles >>> for textures which can be output as dds files. I need to subtile my DEM >>> data in the same way as dds files, so I tried passing the DEM as a texture >>> with "-t ". But the sub-tiles generated when viewed in OSG viewer are >>> totally white. I have confirmed this through code that it is generating all >>> the values as white. My DEM file format is tif and so are my textures, but >>> my textures subtile correctly so why can't my DEMs ? >>> >>> I'm using SUSE Linux 10.3, OSG-2.4, gdal-1.5.1, and vpb-0.9.7. Thanks for >>> your time. >>> >>> Renzil >>> _________________________________________________________________ >>> No Harvard, No Oxford. We are here. Find out !! >>> http://ss1.richmedia.in/recurl.asp?pid=500 >>> _______________________________________________ >>> osg-users mailing list >>> [email protected] >>> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >>> >> >> > _________________________________________________________________ > Catch the latest fashion shows, get beauty tips and learn more on fashion and > lifestyle. > http://video.msn.com/?mkt=en-in > _______________________________________________ > 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
