[osg-users] osg::Node can not be displayed front of the Earth on the screen

[Ali Ozdin]

Thank you very much, I did it. 


Trajce Nikolov NICK wrote:
> if you need to draw anything on the center of the screen in front of something else, then your problem is to create an ortho camera and have your geometry there - something like HUD. The osghud example shows how to do this. Just for a test, you can use the createHUD() function from that sample to create your screen geometry in front of the osgEarth globe
> 
> On Fri, Mar 2, 2018 at 4:23 PM, Ali Ozdin < ()> wrote:
> 
> > I could not relate the example with my question. I am using osgEarth.
> > Can you be more expressive what causes this?
> > 
> > Thanks,
> > 
> > 
> > Trajce Nikolov NICK wrote:
> > 
> > > Hi Ali,
> > > 
> > > have a look at the osghud example from the osg repo
> > > 
> > > 
> > > On Fri, Mar 2, 2018 at 1:44 PM, Ali Ozdin < ()> wrote:
> > > 
> > > 
> > > > Hi,
> > > > 
> > > > I drew an osg Node and I want to put it on the center of the screen like any labelControl. How can I do that? I put a sample code below.
> > > > 
> > > > If I change the line from
> > > > 
> > > > Code:
> > > > viewer.setSceneData( mainGroup );
> > > > 
> > > >  to
> > > > Code:
> > > > viewer.setSceneData( nn.get() );
> > > > 
> > > > 
> > > > and remove these two lines
> > > > 
> > > > Code:
> > > > manipulator = new EarthManipulator(  arguments );
> > > > viewer.setCameraManipulator( manipulator );
> > > > 
> > > > 
> > > > 
> > > > I am only able to see the geometry which I draw. However if I setSceneData as mapNode and geometry which are in "mainGroup" and if my camera manipulator is EarthManipulator; I am only able to see the earth.
> > > > To sum up, I want to see the earth in the back and I want to put my geometry front of the earth and on the center of the screen.
> > > > 
> > > > 
> > > > 
> > > > 
> > > > Code:
> > > > osg::ref_ptr<osg::Node> createSceneGraph()
> > > > {
> > > > osg::ref_ptr<osg::Geometry> geom = new osg::Geometry;
> > > > osg::ref_ptr<osg::Vec3Array> v = new osg::Vec3Array;
> > > > geom->setVertexArray( v.get() );
> > > > 
> > > > //horizontal
> > > > v->push_back( osg::Vec3( -1.f, 1.f, 0.f ) );
> > > > v->push_back( osg::Vec3( -0.6f, 1.f, 0.f ) );
> > > > v->push_back( osg::Vec3( -0.4f, 1.f, 0.f ) );
> > > > v->push_back( osg::Vec3( 0.f, 1.f, 0.f ) );
> > > > 
> > > > //vertical
> > > > v->push_back( osg::Vec3( -0.5f, 1.f, 0.5f ) );
> > > > v->push_back( osg::Vec3( -0.5f, 1.f, 0.1f ) );
> > > > v->push_back( osg::Vec3( -0.5f, 1.f, -0.5f ) );
> > > > v->push_back( osg::Vec3( -0.5f, 1.f, -0.1f ) );
> > > > 
> > > > 
> > > > osg::ref_ptr<osg::Vec4Array> c = new osg::Vec4Array;
> > > > geom->setColorArray( c.get() );
> > > > geom->setColorBinding( osg::Geometry::BIND_OVERALL );
> > > > c->push_back( osg::Vec4( 1.f, 1.f, 1.f, 1.f ) );
> > > > 
> > > > osg::ref_ptr<osg::Vec3Array> n = new osg::Vec3Array;
> > > > geom->setNormalArray( n.get() );
> > > > geom->setNormalBinding( osg::Geometry::BIND_OVERALL );
> > > > n->push_back( osg::Vec3( 0.f, -1.f, 0.f ) );
> > > > 
> > > > osg::LineWidth* linewdth = new osg::LineWidth();
> > > > linewdth->setWidth(25.0);
> > > > geom->getOrCreateStateSet()->setAttributeAndModes( linewdth, osg::StateAttribute::ON ) ;
> > > > geom->addPrimitiveSet( new osg::DrawArrays( osg::PrimitiveSet::LINES, 0, 8 ) );
> > > > 
> > > > osg::ref_ptr<osg::Geode> geode = new osg::Geode;
> > > > geode->addDrawable( geom.get() );
> > > > return geode.get();
> > > > }
> > > > 
> > > > int main(int argc, char** argv)
> > > > {
> > > > osg::ArgumentParser arguments(&argc,argv);
> > > > viewer.setUpViewInWindow(100,100,500,500);
> > > > viewer.getDatabasePager()->setUnrefImageDataAfterApplyPolicy( true, false );
> > > > osgDB::Registry::instance()->getObjectWrapperManager()->findWrapper("osg::Image");
> > > > manipulator = new EarthManipulator( arguments );
> > > > viewer.setCameraManipulator( manipulator );
> > > > 
> > > > osg::Group* mainGroup = new osg::Group();
> > > > osg::Group* group = MapNodeHelper().load(arguments, &viewer);
> > > > osg::ref_ptr<osg::Node> nn = createSceneGraph();
> > > > 
> > > > mainGroup->addChild(nn.get());
> > > > mainGroup->addChild(group);
> > > > 
> > > > viewer.setSceneData( mainGroup );
> > > > viewer.run();
> > > > }
> > > > 
> > > > 
> > > > 
> > > > Thank you!
> > > > 
> > > > Cheers,
> > > > Ali
> > > > 
> > > > ------------------
> > > > Read this topic online here:
> > > > 
> > > 
> > 
> > 
> > 
> > > 
> > > > http://forum.openscenegraph.org/viewtopic.php?p=72998#72998 (http://forum.openscenegraph.org/viewtopic.php?p=72998#72998) (http://forum.openscenegraph.org/viewtopic.php?p=72998#72998 (http://forum.openscenegraph.org/viewtopic.php?p=72998#72998))
> > > > 
> > > > 
> > > > 
> > > > 
> > > > 
> > > > _______________________________________________
> > > > osg-users mailing list
> > > >   ()
> > > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org (http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org) (http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org (http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org))
> > > > 
> > > > 
> > > 
> > > 
> > > 
> > > 
> > > --
> > > trajce nikolov nick
> > > 
> > >   ------------------
> > > Post generated by Mail2Forum
> > > 
> > 
> > 
> > ------------------
> > Read this topic online here:
> > http://forum.openscenegraph.org/viewtopic.php?p=73000#73000 (http://forum.openscenegraph.org/viewtopic.php?p=73000#73000)
> > 
> > 
> > 
> > 
> > 
> > _______________________________________________
> > osg-users mailing list
> >  ()
> > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org (http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org)
> > 
> > 
> > 
> 
> 
> 
> 
> -- 
> trajce nikolov nick
> 
>  ------------------
> Post generated by Mail2Forum


------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=73021#73021