The heights are relative to the ellipsoid, yes. I can send you a code link when I get back (in on the road atm). On Dec 6, 2013 7:55 AM, "Sebastian Messerschmidt" < [email protected]> wrote:
> Am 06.12.2013 13:14, schrieb Glenn Waldron: > > Sabastian, > osgEarth does more or less what Robert describes. We encode each vert's > height value (and unit vector) in a vertex attribute. > > > Thank you Glenn. Are the vertices relative to the Ellipsoid? > Or can you point me to the sources where I can check it myself? > > cheers > Sebastian > > 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 >> >> > > _______________________________________________ > osg-users mailing > [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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