HI David, Are you aware of the OSG's existing paging and terrain support? Are you aware of the VirtualPlanetBuilder tool for creating paged database from geospatial imagery and DEMs? VPB scales to handling terrabytes of data, and the paging of the generated databases works at a solid 60Hz.
Robert. On Tue, Jan 13, 2009 at 1:14 PM, David Karlsson <david.karls...@foi.se> wrote: > Hi, > > I need to visualize a large terrain in real-time using open scene graph. I > have been thinking a bit about how to implement it, but I would really > appreciate any feedback or ideas on this approach. > > First some info about the data: > > - Height: The height data consists of around 1000 tiles in raster format. > Each tile is representing an area of 50x50 km using 501x501 samples. > - Terrain classification: Each tile also has an additional classification map > that needs to be loaded and will be used as a texture (1000x1000 samples). > > What I have come up with so far goes something like this: > > - Create a class that dynamically loads/unloads the data for specific tiles, > based on the location of the viewer, using some kind of paged image loader > - Subdivide each tile using some LOD algorithm. Then draw the geometry with > the height map and classification map assigned as textures. Finally, offset > the geometry by the value in the height map using a vertex shader. > > Can I handle this kind of data in osg in some simpler way? I don't have a lot > of experience of osg and don't really know what's implemented and what > limitations there are. I think the approach described above would work pretty > nice, but maybe I'm going to do a lot of redundant work that is already > implemented? > > Thanks, > David > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
