Re: [osg-users] light through walls
Hi, Before all, I thank Nick and Jean-Sebastian for your pieces of advices. What I try to do now, it's to apply ShadowMap to the SpotLight. I use Delta3D for my initial program, and I have a shader for Spotlight in that program. I've included the ShadowedScene of OpenSceneGraph and my goal now is syncronize my SpotLight with ShadowMaps. If I try to compile the two things, I don't have an unwanted effect. However, If I deactive the shader for the spotlight, I get a shader effect more or less wanted. Thank you! Cheers, Jose -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=29725#29725 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] light through walls
Hi, I'm working with a light (spotlight) concretely. I would like that this light didn't go through walls. How can I obtain this effect? Thank you! -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=28747#28747 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] light through walls
do a search in the archive for light lobes. There is a code posted that do what you ask for -Nick On Wed, Jun 9, 2010 at 7:01 PM, Jose Rincon jm.rincon.pe...@gmail.comwrote: Hi, I'm working with a light (spotlight) concretely. I would like that this light didn't go through walls. How can I obtain this effect? Thank you! -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=28747#28747 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] light through walls
Hi Jose, I'm working with a light (spotlight) concretely. I would like that this light didn't go through walls. How can I obtain this effect? In real life, the fact that a light doesn't go trough walls is a consequence of the fact that solid objects block the light (i.e. cast shadows). The darkness behind a wall is the wall's shadow. Unfortunately the default real-time graphics pipeline doesn't render shadows natively as it's not a raytracing engine (in which shadows come naturally from the algorithm of tracing rays and finding intersections in the scene). In real-time graphics, we must cheat shadows. Have a look at the osgShadow nodekit that's part of OSG, in particular osgShadow::StandardShadowMap and osgShadow::LightSpacePerspectiveShadowMap, and the osgshadow example that ships with OSG's source code. These use a technique called Shadow Mapping which is a good way to render shadows, but has a few gotchas. I recommend you do a bit of reading about these techniques before you use them so you know what to expect. Google can help you find some on-line articles about real-time rendering of shadows and shadow mapping in particular. I also recommend Real-Time Rendering by Tomas Akenine-Moller et al, and Computer Graphics: Principles and Practice by Foley, Van Dam et al. if you want good books about those kinds of things. Hope this helps, J-S -- __ Jean-Sebastien Guayjean-sebastien.g...@cm-labs.com http://www.cm-labs.com/ http://whitestar02.webhop.org/ ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
