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

[Trajce Nikolov NICK]

Hi Ali,

have a look at the osghud example from the osg repo

On Fri, Mar 2, 2018 at 1:44 PM, Ali Ozdin <alinailozdin at gmail.com> 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
>
>
>
>
>
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>



-- 
trajce nikolov nick
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