3D model is not rendering with OSG render lib

Hi,

I am new to Qualcomm SDK. I did ImageTargets sample on my Android device.

Now I am trying to replace tea pot with some 3D object.

To render 3D object i choosed OpenSceneGraph (OSG) library.

I successfully added OSG rendering code to ImageTargets example.

This is the code I added to "renderFrame" method.

 if(mload)//to init OSG   {              LOG("Init==============");     int x=0;  int y=0;  int width=screenWidth;  int height=screenHeight;  _viewer = new osgViewer::Viewer();    _viewer->setUpViewerAsEmbeddedInWindow(x, y, width, height);     _root = new osg::Group();    _viewer->realize();    _state = _root->getOrCreateStateSet();    _state->setMode(GL_LIGHTING, osg::StateAttribute::ON);    _state->setMode(GL_DEPTH_TEST, osg::StateAttribute::ON);    _state->setMode(GL_CULL_FACE, osg::StateAttribute::ON);    _viewer->setSceneData(_root.get());    _viewer->addEventHandler(new osgViewer::StatsHandler);    _viewer->addEventHandler(new osgGA::StateSetManipulator(_viewer->getCamera()->getOrCreateStateSet()));    _viewer->addEventHandler(new osgViewer::ThreadingHandler);    _viewer->addEventHandler(new osgViewer::LODScaleHandler); _manipulator = new osgGA::KeySwitchMatrixManipulator;    _manipulator->addMatrixManipulator( '1', "Trackball", new osgGA::TrackballManipulator() );    _manipulator->addMatrixManipulator( '2', "Flight", new osgGA::FlightManipulator() );    _manipulator->addMatrixManipulator( '3', "Drive", new osgGA::DriveManipulator() );    _manipulator->addMatrixManipulator( '4', "Terrain", new osgGA::TerrainManipulator() );    _manipulator->addMatrixManipulator( '5', "Orbit", new osgGA::OrbitManipulator() );    _manipulator->addMatrixManipulator( '6', "FirstPerson", new osgGA::FirstPersonManipulator() );    _manipulator->addMatrixManipulator( '7', "Spherical", new osgGA::SphericalManipulator() );    _viewer->setCameraManipulator( _manipulator.get() );    _viewer->getViewerStats()->collectStats("scene", true);     //config.mSize.data[0] = screenWidth;      //  config.mSize.data[1] = videoMode.mHeight * (screenWidth / (float)videoMode.mWidth);_viewer->getCamera()->setViewport(0,0,800, 600);//_viewer->setLightingMode(osg::View::HEADLIGHT);    _viewer->getCamera()->setProjectionMatrix(osg::Matrix(projectionMatrix.data));trans=new osg::MatrixTransform();            LOG("Load Model");  osg::ref_ptr<osg::Node> loadedModel = osgDB::readNodeFile("/mnt/sdcard/OSG/lz.osg");  if (loadedModel == 0) {            LOG("Model not loaded");        } else {            LOG("Model loaded");                        loadedModel->setName("/mnt/sdcard/OSG/lz.osg");            //_root->addChild(loadedModel);            trans->addChild(loadedModel.get());        }          _root->addChild(trans.get());        _viewer->setSceneData(NULL);    _viewer->setSceneData(_root.get());     _manipulator->getNode();    _viewer->home();    _viewer->getDatabasePager()->clear();    _viewer->getDatabasePager()->registerPagedLODs(_root.get());    _viewer->getDatabasePager()->setUpThreads(3, 1);    _viewer->getDatabasePager()->setTargetMaximumNumberOfPageLOD(2);    _viewer->getDatabasePager()->setUnrefImageDataAfterApplyPolicy(true, true);    mload=false;  } 

 

 _viewer->frame();// called every time

only with this code the model is rendering on the screen.

But the 3D model is not rendering when I draw video background. That is when I added this statement "QCAR::Renderer::getInstance().drawVideoBackground();" the model is not redering on the screen.

I tried to setting the viewPort and projection matrix to OSG. But still the model is not rendering on the screen.

Can you please help me where am i doing the mistake.

Thanks & Regards

ANReddy.