OSG多视口创建：osgViewer::CompositeViewer

OSG多视口创建：osgViewer::CompositeViewer"/>

OSG多视口创建：osgViewer::CompositeViewer

1、效果

  在osg的实际应用场景中，有时候需要同时创建多个场景视图，并保证各个场景视图中有不一样的显示和操作：例如：漫游器、照相机、粒子效果、多个模型组合等。此时就要用到OSG提供的osgViewer::CompositeViewer类来实现这个需求了。

2、源码

#include <iostream>#include <osgUtil/Optimizer>
#include <osgDB/ReadFile>#include <osg/Material>
#include <osg/Geode>
#include <osg/BlendFunc>
#include <osg/Depth>
#include <osg/Projection>
#include <osg/PolygonOffset>
#include <osg/MatrixTransform>
#include <osg/Camera>
#include <osg/FrontFace>#include <osgText/Text>#include <osgGA/TerrainManipulator>
#include <osgGA/FlightManipulator>
#include <osgGA/StateSetManipulator>
#include <osgViewer/ViewerEventHandlers>#include <osgViewer/CompositeViewer>#include <osg/io_utils>#pragma comment(lib, "OpenThreadsd.lib")
#pragma comment(lib, "osgd.lib")
#pragma comment(lib, "osgDBd.lib")
#pragma comment(lib, "osgUtild.lib")
#pragma comment(lib, "osgGAd.lib")
#pragma comment(lib, "osgViewerd.lib")
#pragma comment(lib, "osgTextd.lib")
#pragma comment(lib, "osgSimd.lib")int main(int argc, char** argv)
{//创建CompositeViewerosgViewer::CompositeViewer viewer;if (viewer.getNumViews() == 0){osg::GraphicsContext::WindowingSystemInterface* wsi = osg::GraphicsContext::getWindowingSystemInterface();if (!wsi){osg::notify(osg::NOTICE) << "Error, no WindowSystemInterface available, cannot create windows." << std::endl;return 1;}unsigned int width, height;osg::GraphicsContext::ScreenIdentifier main_screen_id;main_screen_id.readDISPLAY();main_screen_id.setUndefinedScreenDetailsToDefaultScreen();wsi->getScreenResolution(main_screen_id, width, height);osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits;traits->x = 600;traits->y = 400;traits->width = 1000;traits->height = 800;traits->windowDecoration = true;traits->doubleBuffer = true;traits->sharedContext = 0;traits->readDISPLAY();traits->setUndefinedScreenDetailsToDefaultScreen();osg::ref_ptr<osg::GraphicsContext> gc = osg::GraphicsContext::createGraphicsContext(traits.get());// 第一个视图{osgViewer::View* view = new osgViewer::View;osg::ref_ptr<osg::Node> scene = osgDB::readNodeFile("D:\\osg3.6.5_oe3.1\\OpenSceneGraph_Data\\dumptruck.osg");view->setName("View one");viewer.addView(view);view->setSceneData(scene);view->getCamera()->setName("Cam three");view->getCamera()->setProjectionMatrixAsPerspective(30.0, double(traits->width) / double(traits->height / 2), 1.0, 1000.0);view->getCamera()->setViewport(new osg::Viewport(0, traits->height / 2, traits->width / 2, traits->height / 2));view->getCamera()->setGraphicsContext(gc.get());view->setCameraManipulator(new osgGA::TerrainManipulator);}// 第二个视图{osgViewer::View* view = new osgViewer::View;view->setName("View two");osg::ref_ptr<osg::Node> scene = osgDB::readNodeFile("D:\\osg3.6.5_oe3.1\\OpenSceneGraph_Data\\cow.osgt");viewer.addView(view);view->setSceneData(scene);view->getCamera()->setName("Cam two");view->getCamera()->setViewport(new osg::Viewport(traits->width / 2, traits->height / 2, traits->width / 2, traits->height / 2));view->getCamera()->setGraphicsContext(gc.get());view->setCameraManipulator(new osgGA::TerrainManipulator);}// 第三个视图{osgViewer::View* view = new osgViewer::View;view->setName("View three");osg::ref_ptr<osg::Node> scene = osgDB::readNodeFile("D:\\osg3.6.5_oe3.1\\OpenSceneGraph_Data\\cessnafire.osgt");viewer.addView(view);view->setSceneData(scene);view->getCamera()->setName("Cam one");view->getCamera()->setViewport(new osg::Viewport(0, 0, traits->width / 2, traits->height / 2));view->getCamera()->setGraphicsContext(gc.get());osg::ref_ptr<osgGA::StateSetManipulator> statesetManipulator = new osgGA::StateSetManipulator;statesetManipulator->setStateSet(view->getCamera()->getOrCreateStateSet());view->setCameraManipulator(new osgGA::TerrainManipulator);view->addEventHandler(statesetManipulator.get());view->addEventHandler(new osgViewer::StatsHandler);view->addEventHandler(new osgViewer::HelpHandler);view->addEventHandler(new osgViewer::WindowSizeHandler);view->addEventHandler(new osgViewer::ThreadingHandler);view->addEventHandler(new osgViewer::RecordCameraPathHandler);}// 第四个视图{osgViewer::View* view = new osgViewer::View;view->setName("View four");osg::ref_ptr<osg::Node> scene = osgDB::readNodeFile("D:\\osg3.6.5_oe3.1\\OpenSceneGraph_Data\\robot.osg");viewer.addView(view);view->setSceneData(scene);view->getCamera()->setName("Cam one");view->getCamera()->setViewport(new osg::Viewport(traits->width / 2, 0, traits->width / 2, traits->height / 2));view->getCamera()->setGraphicsContext(gc.get());// add the state manipulatorosg::ref_ptr<osgGA::StateSetManipulator> statesetManipulator = new osgGA::StateSetManipulator;statesetManipulator->setStateSet(view->getCamera()->getOrCreateStateSet());view->setCameraManipulator(new osgGA::TerrainManipulator);view->addEventHandler(statesetManipulator.get());view->addEventHandler(new osgViewer::StatsHandler);view->addEventHandler(new osgViewer::HelpHandler);view->addEventHandler(new osgViewer::WindowSizeHandler);view->addEventHandler(new osgViewer::ThreadingHandler);view->addEventHandler(new osgViewer::RecordCameraPathHandler);}}return viewer.run();
}