Hi Sebastian, osgTerrain is designed to allow you to override the TerrainTechnique attached to the TerrainTile via the Terrain node that can be used to decorate the terrain. The Terrain::setTerrainTechniquePrototype(TerrainTechinque*) is used to set the TerrainTechnique that tiles should use.
By default osgTerrain will use the GeometryTechnique but you provide your own implementation or subclass from GeometryTechnique. Robert. On 2 April 2014 15:38, Sebastian Messerschmidt < sebastian.messerschm...@gmx.de> wrote: > Hi, > > I have geocentric dataset (which is already compiled with osgDEM) and I'm > facing an issue. > In my shaders I rely on valid texture coordinates for tangentSpace > generation and various other effects like detail-splatting. > Unfortunately (and quite obvious due to performance restrictions) the > GeometryTechnique will not create texture coordinates for Terrain tiles > without textures. > Due to missing LandSat-data at this areas, there are no images for those > areas. > > (see around line 484 in GeometryTechnique.cpp) > > I wonder if there are any other options than > a) modifying the VertexNormalGenerator::populateCenter function to create > texture coordinates anyways > b) Overriding the GeometryTechnique to use a custom VertexNormalGenerator > which clones the functionality of the original one + adding texture > coordinates for tiles without ImageLayer. > > Since the dataset is quite big, so recompiling it is out of the question > right now. > Also it would be a performance killer to traverse the TerrainTile manually > and re-add some fake image layer. > > My idea would be to change the vertexNormalGenerator to optionally create > texture coordinates. But I don't have an idea yet how to get this option > into it. > > Any hints, ideas? > > > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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