Doubtful really as lines don't have back faces.. Gordon
__________________________________________________________ Gordon Tomlinson Email : gtomlinson @ overwatch.textron.com -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Korolyov Ilia Sent: Thursday, September 11, 2008 9:20 AM To: OpenSceneGraph Users Subject: Re: [osg-users] painting plane Hello This technic working fine for poligons, but is it possible to make this trick to lines? I need exactly two lines, not three as in triangle. I trying in such way group->addChild( geode_with_poligons ); group->addChild( geode_with_lines ); group->getOrCreateStateSet()->setMode( GL_CULL_FACE, GL_BACK | osg::StateAttribute::OVERRIDE | osg::StateAttribute::ON ); Thanks Ilia В Чтв, 11/09/2008 в 14:46 +0400, Korolyov Ilia пишет: > Hello, Robert > > Thanks so much - it really helps > > Ilia > > В Чтв, 11/09/2008 в 11:38 +0100, Robert Osfield пишет: > > Hi Ilia, > > > > If one side of the plane should be red, and the other blue then you > > could render two polygons for the plane, each with opposite winding > > and colour, then use glCullFace(osg::CullFace) to cull the faces to > > give the illusion of changing colour. The other technique you could > > use of two sided colour in the OpenGL lighting/material model, not > > all hardware/drivers supports two side lighting though. > > > > Robert. > > > > On Thu, Sep 11, 2008 at 11:22 AM, Korolyov Ilia <[EMAIL PROTECTED]> wrote: > > > Hello > > > > > > I need to draw a plane (more exactly two lines by three points). > > > Problem is in plane color. It must depends on camera position > > > relative plane side - red or blue. > > > > > > I did it with CullCallback, because it's only one way to get > > > access to camera, which I can find. > > > > > > What is right way to do it? > > > > > > Thanks > > > Ilia > > > > > > _______________________________________________ > > > osg-users mailing list > > > [email protected] > > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegr > > > aph.org > > > > > _______________________________________________ > > osg-users mailing list > > [email protected] > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegrap > > h.org > > _______________________________________________ > 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 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
