Sabastian, osgEarth does more or less what Robert describes. We encode each vert's height value (and unit vector) in a vertex attribute. On Dec 6, 2013 5:43 AM, "Robert Osfield" <[email protected]> wrote:
> Hi Sebastian, > > Personally I'd subclass from osgTerrain::GeometryTechnique and pass a > FloatArray as a vertex attrib array or tex coord array and store the > heights there. > > Robert. > > > On 4 December 2013 13:23, Sebastian Messerschmidt < > [email protected]> wrote: > >> Hi, >> >> I have a osgDEM produced geocentric database. >> I looked into the geometryTechnique implementation to see if I somehow >> can access the height of the vertices above the ellipsoid in the vertex >> shader. >> Unfortunately I don't have any idea how to calculate this from the give >> matrices. Is this information somehow available at all? >> My plan is to overwrite some of the functionality in the >> geometryTechnique to pass the appropriate matrices to the shader. >> Anyone having an idea? >> >> >> _______________________________________________ >> 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 > >
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