You are correct that it has something to do with BoundingBox. The BoundingBox around a single point (or two coincident points, in this case) has zero volume, so either the CullVisitor is discarding it, or the auto compute of near far is computing two coincident planes and everything is clipped. Either way, you see nothing. For a solution, grep the source for setInitialBound. 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 Mojtaba Fathi Sent: Thursday, May 28, 2009 4:04 PM To: OpenSceneGraph Users Subject: [osg-users] Drawing a point Hi all Accept my apology for such a simple question. I want to display two coincident points at (0,0,0). I use code like this: int main() { osgViewer::Viewer viewer; osg::ref_ptr<osg::Group> root (new osg::Group); osg::ref_ptr<osg::Geode> geode (new osg::Geode()); osg::ref_ptr<osg::Geometry> geometry (new osg::Geometry()); osg::ref_ptr<osg::Vec3Array> vertices (new osg::Vec3Array()); vertices->push_back (osg::Vec3 ( 0.0, 0.0, 0.0)); vertices->push_back (osg::Vec3 ( 0.0, 0.0, 0.0)); geometry->setVertexArray (vertices.get()); geometry->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::POINTS,0,vertices->size())); osg::Point *point=new osg::Point; point->setSize(4); root->getOrCreateStateSet()->setAttribute(point); geode->addDrawable (geometry.get()); root->addChild(geode.get()); viewer.setSceneData( root.get() ); return (viewer.run()); } But it displays nothing. I think it relates to BoundingBox and culling, so what should I do to display two coincident points at (0,0,0)? And how to do it for just one point? Regards, Moji
_______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
