[osg-users] Shadow projected on the opposite side too

[Christian Buchner]

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.petitprez at 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 at lists.openscenegraph.org
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openscenegraph.org/pipermail/osg-users-openscenegraph.org/attachments/20160428/3240def7/attachment-0002.htm>