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

[Trajce Nikolov NICK]

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 <alinailozdin at gmail.com> 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)
> > >
> > >
> > >
> > >
> > >
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> > >
> >
> >
> >
> >
> > --
> > trajce nikolov nick
> >
> >  ------------------
> > Post generated by Mail2Forum
>
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> ------------------
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> http://forum.openscenegraph.org/viewtopic.php?p=73000#73000
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trajce nikolov nick
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