On 5 January 2016 at 18:52, Nickolai Medvedev <[email protected]> wrote: > Hello, Robert. > > In VirtualPlanetBuilder there is no "manual" control, to be exact - it is > impossible to specify the fixed quantity of triangles or vertices, or the > landscape size. Why so?
VirtualPlanetBuilder by default generates tiles as osgTerrain::TerrainTile, the TerrainTile has a user definable TerrainTechnique that builds the final geometry data from the heightfiled+texture data provided by the TerrainTile. There are now two TerrainTechnique implementations in OSG-3.4, GeometryTechnique and DisplacementMappingTechnique. Currently GeometryTechnique honours the Terrain::SampleRatio and will downsample to fit with the target SampleRatio, DisplacementMappingTechnique doesn't yet have this support. In general though one builds a VPB database with the appropriate resolution in mind so downsampling isn't required. It's all LOD'd and paged with it so load balancing is done automatically for you, It's not a "fixed quantity of triangles or vertices" but it such a metric is a misleading one to use in most applications including games, the bottom line is hitting a solid framerate, this is what VPB and the osgDB::DatabasePager are all about. I can't help but feel that you are a bit blinkered by preconceptions how one to solve problems rather than setting the goals in a more objective way relative to the game deliverables. Robert. _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
