Hi, I'm the original poster, and the problem I had is that I cannot use a material, because it will modify the state set, that is common for a lot of other geodes...
But thanks for the answers, maybe i'll have some kind of revelation with your help. Can't it be interesting for OSG to have a setTransparency() method on a node ? using material or something else, but working in each case... Thanks. Regards, Vincent. 2009/6/9 Jason Daly <[email protected]> > Andrew Cunningham wrote: > >> Adjusting the material color alpha will work for some geometries but I >> have other geometries where each vertex has a BIND_PER_VERTEX color ( think >> of a contour plot of a value), so I would still need to adjust the alpha of >> each vertex color. >> >> > > Actually you don't (unless you need a different alpha for each vertex). > Normally, the material's settings will override the color array values. > However, if you set the Material's color mode to some value other than > NONE, the material color for that element (AMBIENT, DIFFUSE, > AMBIENT_AND_DIFFUSE, SPECULAR, or EMISSION) will be replaced by the vertex > color. Unless you doing something fancy, you can typically set the color > mode to AMBIENT_AND_DIFFUSE, which lets you make use of your vertex colors, > but vary the alpha as you need to. > > Look in the red book, or the glColorMaterial man page for more info. > > --"J" > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
_______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
