if the w coordinate of your projected shadow texture coordinate is < 0, you should reject the shadow. This is quite easy to do in GLSL.
The same technique can be used both for projective texture mapping and for shadow mapping. Christian 2016-04-28 11:40 GMT+02:00 Pierre-Jean Petitprez < pierre-jean.petitp...@inria.fr>: > Hi dear OSG users, > > I'm wondering how to correctly use osgShadow. As you can see on the file I > have attached, the shadow map is projected on the receiving object also on > a face which should normaly not receive the shadow from the sphere (on my > example the light is at the top right corner). It behaves like if the top > face did not stop the light to continue its path through the object (which > is not transparent). > My example is with soft shadow but I tested with other techniques and it > is the same behaviour. > > Is there a way to avoid such behaviour with osgShadow ? > Thank you. > > Cheers, > Pierre-Jean > > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > >
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