OSG RTT 渲染到纹理

 #include
 #include
 #include
 #include
 #include
 #include
 #include
 #include

 #include


 using namespace std;


 void CreateTexture(osgViewer::Viewer *viewer){
   if(!viewer)
     return;

   osg::GraphicsContext::WindowingSystemInterface *wsi= osg::GraphicsContext::getWindowingSystemInterface();
   if(!wsi){
     cout<<"wsi is NULL"<
     return;
   }
   unsigned int width,height;
   wsi->getScreenResolution(osg::GraphicsContext::ScreenIdentifier(0), width, height);

   osg::ref_ptrtraits=new osg::GraphicsContext::Traits;
   traits->x=0;
   traits->y=0;
   traits->width=width;
   traits->height=height;
   traits->windowDecoration=false;
   traits->doubleBuffer=true;
   traits->sharedContext=0;

   osg::ref_ptrgc=osg::GraphicsContext::createGraphicsContext(traits);
   if(!gc.valid()){
     cout<<"gc is NULL" <
     return;
   }
   osg::ref_ptrmaster=new osg::Camera;
   master->setGraphicsContext(gc);
   master->setViewport(0, 0, width, height);
   viewer->addSlave(master.get());
   cout<"  ,  "<

   osg::ref_ptrrttCamera=new osg::Camera;
   rttCamera->setRenderOrder(osg::Camera::PRE_RENDER);//最先渲染
   rttCamera->setGraphicsContext(gc);
   rttCamera->setViewport(0, 0, width, height);
   rttCamera->addChild(osgDB::readNodeFile("ceep.ive"));
   viewer->addSlave(rttCamera,false);




   osg::ref_ptrroot=new osg::Group;
   osg::ref_ptrgeode=new osg::Geode;
   root->addChild(geode);

   osg::ref_ptrgm=new osg::Geometry;
   geode->addDrawable(gm);

   osg::ref_ptrvertex=new osg::Vec3Array;
   vertex->push_back(osg::Vec3(-400,200,-300));
   vertex->push_back(osg::Vec3(400,200,-300));
   vertex->push_back(osg::Vec3(400,200,300));
   vertex->push_back(osg::Vec3(-400,200,300));
   gm->setVertexArray(vertex);

   osg::ref_ptrnorm=new osg::Vec3Array;
   norm->push_back(osg::Vec3(0,-1,0));
   gm->setNormalArray(norm);
   gm->setNormalBinding(osg::Geometry::BIND_OVERALL);

   osg::ref_ptrcoord=new osg::Vec2Array;
   coord->push_back(osg::Vec2(0,0));
   coord->push_back(osg::Vec2(1,0));
   coord->push_back(osg::Vec2(1,1));
   coord->push_back(osg::Vec2(0,1));
   gm->setTexCoordArray(0, coord);
   gm->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS,0,4));
   gm->getOrCreateStateSet()->setMode(GL_LIGHTING,osg::StateAttribute::OFF);

   osg::ref_ptrt2d=new osg::Texture2D;
 /*  osg::ref_ptrimage=osgDB::readImageFile("Images/blueFlowers.png");
   if(!image){
     cout<<"image is NULL"<
     return;
   }
   t2d->setImage(0,image);
 */

   t2d->setInternalFormat(GL_RGBA);
 //  viewer->getCamera()->attach(osg::Camera::COLOR_BUFFER, t2d);

   rttCamera->attach(osg::Camera::COLOR_BUFFER,t2d);

   gm->getOrCreateStateSet()->setTextureAttributeAndModes(0, t2d,osg::StateAttribute::ON);

   root->addChild(osgDB::readNodeFile("ceep.ive"));

   viewer->setSceneData(root);
   return;

 }
 int main(int argc, char *argv[])
 {
   osg::ref_ptrviewer=new osgViewer::Viewer;
   CreateTexture(viewer);

   viewer->addEventHandler(new osgViewer::WindowSizeHandler);
   viewer->addEventHandler(new osgViewer::ScreenCaptureHandler);
   return viewer->run();
   return 0;
 }

转载地址：http://blog.csdn.net/zhuyingqingfen/article/details/8241028