0.0 <= shadow2DProj( shadow_texture, projShadow ).r <= 1.0 Shimering is a result of self shadowing. Boosting depths in shadow map with glPolygonOffset usuallly fixes this. There are many schools for PolygonOffset settings. I usually set glPolygonOffset( 1.1, 4.0 ) and draw objects with front face culling (see StandardShadowMap::ViewData::init(0 for details ). But for this setup models need to work correctly with backface culling on. If you do not enforce backface culling PolygonOffset may need different initialization.
Wojtek ----- Original Message ----- From: Trajce Nikolov To: OpenSceneGraph Users Sent: Friday, January 15, 2010 2:46 PM Subject: Re: [osg-users] light lobes and shadow maps one more question. What are the possible values for shadow2DProj( shadow_texture, projShadow ).r ? I am trying to put the light attenuation back ..... and to avoid the shimmering Nick http://www.linkedin.com/in/tnick Sent from Devlet, Ankara, Turkey On Fri, Jan 15, 2010 at 3:35 PM, Trajce Nikolov <[email protected]> wrote: Hey Wojtek !!!! Thanks a lot. !! I will tune it to fix the shimmering Nick http://www.linkedin.com/in/tnick On Fri, Jan 15, 2010 at 3:08 PM, Wojciech Lewandowski <[email protected]> wrote: Trajce, Attached is a fixed source code. There is a lots of shadow shimmering on my GF8800. You will have to add some depth bias while rendering shadow map. Selection proper PolygonOffset values is usually a matter of trial and error so leave this for you. Wojtek ----- Original Message ----- From: Trajce Nikolov To: OpenSceneGraph Users Sent: Friday, January 15, 2010 9:58 AM Subject: Re: [osg-users] light lobes and shadow maps ABout the code. I use shader to simulate lght lobes thru phong lighting in the shader. Then I use shadow maps to detect the area behind the obstacles that need not to be lighten. Most is mixture of shadow maps technique with lighting scheme. Code snippets borrowed from all around Nick http://www.linkedin.com/in/tnick Sent from Devlet, Ankara, Turkey On Fri, Jan 15, 2010 at 10:54 AM, Trajce Nikolov <[email protected]> wrote: Hi Guys, here is the code. Nick http://www.linkedin.com/in/tnick Sent from Devlet, Ankara, Turkey On Thu, Jan 14, 2010 at 11:42 PM, Wojciech Lewandowski <[email protected]> wrote: Hi Nick, Post the troublesome code and elaborate a bit more about the problem. If its really a minute or two I am sure someone will be able to help. Wojtek Lewandowski From: Trajce Nikolov Sent: Thursday, January 14, 2010 8:58 PM To: OpenSceneGraph Users Subject: [osg-users] light lobes and shadow maps Hi community, I have some shader that does some lighting in the scene. Now studying osgShadow and the techniques. I want to a shadow map technique to disable the lightening of the scene behind obstacles. I have some code done, but not working. I need some help, someone experienced with GLSL to spend a minute or to to have a look and if possible to spot the problem. Anyone? Thanks a lot Nick http://www.linkedin.com/in/tnick Sent from Izmit, 41, Turkey -------------------------------------------------------------------- _______________________________________________ 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 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 list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
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