Ben, Looks like back projection issue. If your light is spot light with cone < 180 deg then it could be fixed by one of the tricks used to clip back projected textures (additional clip plane or special 1D texture). You should find a lot of stuff in the web that explain texgen projections and related issues. But if your light is omnidirectional I am afraid none of the shadow mapping algorithms in osgShadow will work. They may do if omnidirectional light could be approximated by spot light for this particular view/frame.
But in general case omnidirectional light requires more than one shadow map. And your picture looks like such situation where one shadow map does not suffice. Cheers, Wojtek ----- Original Message ----- From: Ben Axelrod To: [email protected] Sent: Friday, February 13, 2009 5:08 PM Subject: Re: [osg-users] inverse shadows *ping* Sorry for the repost, but there has not been a response on this in several days. I am seeing some strange behavior with the ShadowMap. The attached images show a white sphere which is at the same location as the only light in the scene. It is between an arrow, and a cube. The shadow on the arrow gets back-cast to the cube, and even shows up on the back of the cube. Is this normal? How can this behavior be fixed? I am using OSG version 2.6. Thanks, -Ben ------------------------------------------------------------------------------ _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
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