Hi Sanat, I have not read the complete source code of VPB yet, but my current understanding is: Visualizing a VPB terrain, you only load the root file. This means, in the root file the next sublevel tiles must be noted down. So if we are zooming in, the viewer calculates the appropriate LOD level, and if the root tile is to near, he looks if any subtiles registered, and if yes, it replaces the root tile with the 4 subtiles. This procedure is done by the viewer for every tile displayed, not only for the root tile. I strongly assume the register tile procedure is done by VPB during the build process and is not a todo for our display process.
So in my assumption I think we have to figure out how the LOD system is realized and how we can get a tiles (for all LODs) of a location, because we have to alter tiles not only on one but on all affected LODs. Yesterday I copied the osgTerrain example and tested it, it word out of the box as it should, so I think you may have used an invalid filename or invalid path. There is an example terrain in the example data, so if you have a valid OSG build environment, you can just call “osgTerrain.exe terrain.osg” from any directory of your computer and it should work! Today I will dive a little bit into VPB code to get a clue how the compiling and LOD is done. Especially the patching function of VPB is interesting because it shows us how to change existing tiles, iterating through all LODs and optionally saving it back :) Additionally I will extend the osgTerrain example to use my own terrain technique to modify the terrain tile. Cheers, Torben ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=33966#33966 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
