The standard way to modify aloha in OpenGL fixed function (non-shader) rendering is to use glBlendColor and set a blending function of GL_CONSTANT_COLOR, GL_ONE_MINUS_CONSTANT_COLOR. Hope that helps. Paul Martz Skew Matrix Software LLC http://www.skew-matrix.com <http://www.skew-matrix.com/> +1 303 859 9466
_____ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Nicholas Bannister Sent: Wednesday, August 27, 2008 9:00 AM To: [email protected] Subject: [osg-users] *.osg File Transparency ORIGINAL: I have loaded a *.osg file and I am using and osg::StateSet and setting a material to have an alpha value of 0.5 to set the transparency. The problem is that it comes out only transparent on one side and completely Grey scale. I suspect that that the Materials set within the *.osg file are overriding and/or interfering with my settings. How do I go about setting the global transparency, and thus overriding any local transparency settings, front and back faces, while still maintaining all the the colors of all the child nodes from the osg file. this is what i have node = osgDB::readNodeFile( qPrintable(fullPathCopy) ); if (!node) return false; osg::StateSet* state = node->getOrCreateStateSet(); state->setMode(GL_BLEND,osg:: StateAttribute::ON| osg::StateAttribute::OVERRIDE); osg::Material* mat = new osg::Material; mat->setAlpha(osg::Material::FRONT_AND_BACK, 0.8); state->setAttributeAndModes(mat,osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE); osg::BlendFunc* bf = new osg::BlendFunc(osg::BlendFunc::SRC_ALPHA, osg::BlendFunc::ONE_MINUS_SRC_ALPHA ); state->setAttributeAndModes(bf); state->setRenderingHint(osg::StateSet::TRANSPARENT_BIN); state->setMode(GL_LIGHTING, osg::StateAttribute::ON); node->setState NEW: after playing with the code a little bit, i realize that what i want to be able to do is override ONLY the transparency and have all the colors remain the same. So the parent node transparency override ONLY the child node transparency, but not the child nodes color.
_______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
