Back face culling ONLY works for triangles/polygons it does not work for points or lines/wireframe
Its not the normal you supply its more than that and is driver specific, as you can be per-vert normal, over all triangle, overall geom can be used Gordon __________________________________________________________ Gordon Tomlinson Product Manager 3D Email : gtomlinson @ overwatch.textron.com __________________________________________________________ (C): (+1) 571-265-2612 (W): (+1) 703-437-7651 "Self defence is not a function of learning tricks but is a function of how quickly and intensely one can arouse one's instinct for survival" - Master Tambo Tetsura -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Martin Beckett Sent: Wednesday, February 18, 2009 2:24 PM To: [email protected] Subject: [osg-users] Confused about back face culling I want to draw a model as wireframe/points without the rear part being shown. I thought Back Face Culling only draws triangles with the normal facing the camera, but it doesn't hide the rear surface. The suggestions in the mailing list are to do the two pass technique of drawing the surface model invisibly and then drawing the wireframe/points over the top. Is there any specific support for this in OSG? And what use is backface culling then? Martin _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.or g _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
