Hello Nelson, > I'm still new to all this. All I found on emissive color is the following: > > glMaterial Default Parameters > GL_EMISSION (0.0, 0.0, 0.0, 1.0) emissive color of material
The OpenSceneGraph is a rather thin wrapper of OpenGL, so in most cases the OpenGL documentation will be useful to make sense out of what OSG does. In most cases, if you see a method name in OSG's doxygen reference, you can search for similar names in OpenGL and you will find out what it does. In this case, "Chapter 5 - Lighting" from the red book will be useful. http://www.glprogramming.com/red/chapter05.html At around 1/6th of the page, you will see: "In addition to ambient, diffuse, and specular colors, materials have an emissive color, which simulates light originating from an object. In the OpenGL lighting model, the emissive color of a surface adds intensity to the object, but is unaffected by any light sources. Also, the emissive color does not introduce any additional light into the overall scene." To understand what the emissive color will give as a result, see around 5/6th of the page, where you will find the general lighting equation OpenGL uses: The color produced by lighting a vertex is computed as follows: "vertex color = the material emission at that vertex + the global ambient light scaled by the material's ambient property at that vertex + the ambient, diffuse, and specular contributions from all the light sources, properly attenuated So if you just want your color independently of any lighting, you should set your color as the material's emissive color, and disable all other lighting in the scene (or at least for those nodes in the scene graph). > Is this what you had in mind: > > > osg::StateSet* state = geode->getOrCreateStateSet(); > state ->setMode(GL_COLOR_MATERIAL,osg::StateAttribute::ON); > osg::ref_ptr<osg::Material> mat = new osg::Material; > mat->setColorMode(osg::Material::EMISSION); > state->setAttribute(mat.get() The problem there is that you don't set the emissive color. I think this should work, but untested... : osg::StateSet* state = geode->getOrCreateStateSet(); osg::ref_ptr<osg::Material> mat = new osg::Material; mat->setEmission(osg::Material::FRONT_AND_BACK, osg::Vec4(1.0, 1.0, 1.0, 1.0); // Set the color to whatever you want state->setMode(GL_LIGHTING, osg::StateAttribute::OFF); state->setAttribute(mat.get()); But you were definitely on the right track. Good luck, J-S -- ______________________________________________________ Jean-Sebastien Guay [EMAIL PROTECTED] http://whitestar02.webhop.org/ ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program. _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
