Thanks for the explanation David. Changes now merged and submitted to svn/trunk.
On Tue, Nov 9, 2010 at 6:16 PM, David Callu <[email protected]> wrote: > Hi Robert, > > > > 2010/11/9 Robert Osfield <[email protected]> >> >> Hi David, >> >> I'm just testing your changes and can't comment too much on the >> specifics of the algorithm/maths as I'm not the author of this shadow >> technique, so I mainly have to go on what the end results look like, >> and whether the code looks sensible. >> >> In testing I used your "osgshadow --noUpdate --pssm --maxFarDist 500 >> --minNearSplit 500 --mapcount 6 --debug-color model_test.3ds" >> command line, and also tested it without the --maxFarDist etc. options >> so used: >> >> osgshadow --noUpdate --pssm --debug-color model_test.3ds >> > > > > With this command line, ( without --minNearSplit 500), shadow camera is too > near > of the split when shadowMap is created, and some part of the model which > cast shadow is clipped. > > As you can see in your screenshoot, error in red split is bigger than one in > green split, > because red split volume is smallest of the green one, and the wall which > cast shadow is more clipped by red split > that by green split when shadowMap is created. > if you move the camera near the wall on right, error become smallest, > if you move the camera far the wall on right, error become biggest, > > You can see minNearSplit option as : > What is the minimal distance between split and an element in the scene for > this element can cast a shadow in split ? > default is 5.0. > > User must adapte this value to the scene. > > >> When I did this and then zoomed in close to the object I got an error >> in the shadow region, with part of the shadow being clipped out. I've >> attached the a pick of the problem. >> >> >> Do you see a similar problem? Any ideas? >> >> Robert. >> > > HTH > David >> >> _______________________________________________ >> osg-submissions mailing list >> [email protected] >> >> http://lists.openscenegraph.org/listinfo.cgi/osg-submissions-openscenegraph.org >> > > > _______________________________________________ > osg-submissions mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-submissions-openscenegraph.org > > _______________________________________________ osg-submissions mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-submissions-openscenegraph.org
