Hi Phil, if you are working with your own shaders you can query front and back in the fragment shader.
Werner On 7. Mai 2020 17:42:35 MESZ, OpenSceneGraph Users <osg-users@lists.openscenegraph.org> wrote: > >Hello, > >I have a triangle geometry and I'm displaying it in various material >modes. >The standard is just a texture. What I want is the backside of the >geometry >to be slightly darker than the front. > >So I configure my lighting like this > >osg::ref_ptr<osg::LightModel> lm = new osg::LightModel; >lm->setTwoSided(true); >m_geometry->getOrCreateStateSet()->setAttributeAndModes(lm); > >and then I set up my material like this, in addition to setting a >texture. > >m_material->setAmbient(osg::Material::FRONT_AND_BACK, xmx::osg::black); >m_material->setDiffuse(osg::Material::FRONT_AND_BACK, xmx::osg::black); >m_material->setEmission(osg::Material::FRONT, osg::Vec4(ff, ff, ff, >1.0f)); >m_material->setEmission(osg::Material::BACK, osg::Vec4(fb, fb, fb, >1.0f)); >m_material->setColorMode(osg::Material::ColorMode::OFF); > >ff and fb here are two different values, ff usually being just 1 and fb > >something less than 1 to make the backside darker. >This works great for me. > >Now I also have a mode where I can set per-vertex colors in addition to >a >texture, and I want to combine it. >This works if I just drop the material and set a color array with the >provided colors, >but then I loose the feature of different front and back lighting, or >generally the possibility to dampen front and back >intensity separately. > >Is there any way to achieve this without writing my own shader? > >I tried to set the color mode of the material to AMBIENT_AND_DIFFUSE or > >to EMISSION and added the material, >which resulted in no spectacular changes. >How could I combine the material with the texture and color array? > >Thank you in advance, >Phil > >-- >You received this message because you are subscribed to the Google >Groups "OpenSceneGraph Users" group. >To unsubscribe from this group and stop receiving emails from it, send >an email to osg-users+unsubscr...@googlegroups.com. >To view this discussion on the web visit >https://groups.google.com/d/msgid/osg-users/109aa9e5-0fa3-4dda-bbd7-e6aff3e11131%40googlegroups.com. > > >------------------------------------------------------------------------ > >_______________________________________________ >osg-users mailing list >osg-users@lists.openscenegraph.org >http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
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