[osg]osg背景图设置

转自：https://blog.csdn.net/qq_30754211/article/details/61190698

#include <osg/Geometry>
#include <osg/Geode>
#include <osg/Depth>
#include <osg/Texture2D>
#include <osgDB/ReadFile>
#include <osgViewer/Viewer>  

int main( int argc, char** argv )
{
    osg::ref_ptr<osg::Texture2D> texture = new osg::Texture2D;
    osg::ref_ptr<osg::Image> image = osgDB::readImageFile( "D:/background1.png" );
    texture->setImage( image.get() );  

    osg::ref_ptr<osg::Drawable> quad = osg::createTexturedQuadGeometry(osg::Vec3(), osg::Vec3(1.0f, 0.0f, 0.0f), osg::Vec3(0.0f, 1.0f, 0.0f) );
    quad->getOrCreateStateSet()->setTextureAttributeAndModes( ,texture.get());  

    osg::ref_ptr<osg::Geode> geode = new osg::Geode;
    geode->addDrawable( quad.get() );  

    osg::ref_ptr<osg::Camera> camera = new osg::Camera;
    camera->setClearMask(  );
    camera->setCullingActive( false );
    camera->setAllowEventFocus( false );
    camera->setReferenceFrame( osg::Transform::ABSOLUTE_RF );
    camera->setRenderOrder( osg::Camera::POST_RENDER );
    camera->setProjectionMatrix( osg::Matrix::ortho2D(0.0, 1.0, 0.0, 1.0) );
    camera->addChild( geode.get() );  

    osg::StateSet* ss = camera->getOrCreateStateSet();
    ss->setMode( GL_LIGHTING, osg::StateAttribute::OFF );
    ss->setAttributeAndModes( new osg::Depth(osg::Depth::LEQUAL, 1.0, 1.0) );  

    osg::ref_ptr<osg::Group> root = new osg::Group;
    root->addChild( camera.get() );
    root->addChild( osgDB::readNodeFile("cessna.osg") );  

    osgViewer::Viewer viewer;
    viewer.setSceneData( root.get() );
    return viewer.run();