Re: [osg-users] How to make sure that both the back and the front side of a polygon are lit...
* Hi Tony and Alberto, The following is a snippet of the code I have tried .. It continues to light up only one side of the geometry ... osg::StateSet* st = topo-getOrCreateStateSet(); * *osg::Group* topo = new osg::Group; * *osg::Material* matirial = new osg::Material; * *matirial-setColorMode(osg::Material::DIFFUSE); * *matirial-setAmbient(osg::Material::FRONT_AND_BACK, osg::Vec4(0, 1, 0, 1)); * *matirial-setSpecular(osg::Material::FRONT_AND_BACK, osg::Vec4(0, 1, 0, 1)); * *matirial-setEmission(osg::Material::FRONT_AND_BACK, osg::Vec4(0, 1, 0, 1)); * *matirial-setShininess(osg::Material::FRONT_AND_BACK, 10.0f); * *st-setAttributeAndModes (matirial,osg::StateAttribute::ON); * *osg::LightModel* ltModel = new osg::LightModel; * *ltModel-setTwoSided(true); * *st-setAttribute(ltModel); * */* render the geometry in the children nodes ... */* If I reverse the normals the opposite side lights up as expected .. Am I doing something wrong.. Sunil. On Tue, Jun 29, 2010 at 2:23 PM, Tony Horrobin a.j.horro...@its.leeds.ac.uk wrote: Hi Sunil, Just to be clear, you also need to specify a two-sided light model to make OpenGL apply both front and back materials. The osg::LightModel class allows this. Cheers, -Tony ___ 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] How to make sure that both the back and the front side of a polygon are lit...
Sunil S Nandihalli writes: Hi Tony and Alberto, The following is a snippet of the code I have tried .. It continues to light up only one side of the geometry ... osg::StateSet* st = topo-getOrCreateStateSet(); osg::Group* topo = new osg::Group; osg::Material* matirial = new osg::Material; matirial-setColorMode(osg::Material::DIFFUSE); matirial-setAmbient(osg::Material::FRONT_AND_BACK, osg::Vec4(0, 1, 0, 1)); matirial-setSpecular(osg::Material::FRONT_AND_BACK, osg::Vec4(0, 1, 0, 1)); matirial-setEmission(osg::Material::FRONT_AND_BACK, osg::Vec4(0, 1, 0, 1)); matirial-setShininess(osg::Material::FRONT_AND_BACK, 10.0f); st-setAttributeAndModes (matirial,osg::StateAttribute::ON); osg::LightModel* ltModel = new osg::LightModel; ltModel-setTwoSided(true); st-setAttribute(ltModel); /* render the geometry in the children nodes ... */ If I reverse the normals the opposite side lights up as expected .. Am I doing something wrong.. You also have to deactivate face culling for st with GL_CULL_FACE. -- Alberto ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] How to make sure that both the back and the front side of a polygon are lit...
Hi Sunil, Sunil S Nandihalli writes: Hello everybody, I would like to have both the front and the back side of the polygons I draw lit. Right now I have specified the normals and only the side which is on the same side as that of the normals is being lit.. Should I render the same-geometry twice and add normals to it so that it is lit on both sides.. I realized this might not be the right way to do it.. Does any of you have any suggestion? You are already doing it right. Just render once, disable the face culling with osg::StateSet in order to allow both sides to be seen, and specify a material for the back side or at the same time you defined the front one. -- Alberto ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] How to make sure that both the back and the front side of a polygon are lit...
Hi Sunil, Just to be clear, you also need to specify a two-sided light model to make OpenGL apply both front and back materials. The osg::LightModel class allows this. Cheers, -Tony ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] How to make sure that both the back and the front side of a polygon are lit...
Hello everybody, I would like to have both the front and the back side of the polygons I draw lit. Right now I have specified the normals and only the side which is on the same side as that of the normals is being lit.. Should I render the same-geometry twice and add normals to it so that it is lit on both sides.. I realized this might not be the right way to do it.. Does any of you have any suggestion? Thanks for reading this email.. Sunil. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
