Hi Wojtek, now I spent more time exploring this, the polyoffset seam to work, but there is still a bit of shimmering. Its interesting, I put the light source in move, when it moves backwards, the obstacles are lighten ok, but forward, when the light comes close to the obstacles, the lighting is incorrect with shimmering . Any clue how to resolve this artifact ?
Nick http://www.linkedin.com/in/tnick On Fri, Jan 15, 2010 at 4:48 PM, Trajce Nikolov <[email protected]>wrote: > ok .. make sense. Here is updated code, if some one wants to benefit from. > LightLobes with handling of obstacles :). Thanks to Wojiech, Robert and the > online community > > Nick > > http://www.linkedin.com/in/tnick > Sent from Devlet, Ankara, Turkey > > On Fri, Jan 15, 2010 at 3:53 PM, Wojciech Lewandowski < > [email protected]> wrote: > >> 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 <[email protected]> >> *To:* OpenSceneGraph Users <[email protected]> >> *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 <[email protected]> >>>> *To:* OpenSceneGraph Users <[email protected]> >>>> *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 <[email protected]> >>>>>> *Sent:* Thursday, January 14, 2010 8:58 PM >>>>>> *To:* OpenSceneGraph Users <[email protected]> >>>>>> *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 >> >> >> _______________________________________________ >> osg-users mailing list >> [email protected] >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >> >> >
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