osg::Camera example

#ifdef _WIN32
#include <Windows.h>
#endif // _WIN32
#include<iostream>

#include <osgViewer/Viewer>
#include <osgViewer/ViewerEventHandlers> 
#include <osgViewer/CompositeViewer> 

#include <osgDB/ReadFile>

#include <osg/Geode>
#include <osg/Node>
#include <osg/Geometry>
#include <osg/GraphicsContext>
#include <osg/ShapeDrawable>
#include <osg/Material>
#include <osg/Image>
#include <osg/Texture2D>
#include <osg/TexEnv>
#include <osg/TexGen>
#include <osg/NodeVisitor>
#include <osg/MatrixTransform>
#include <osg/PositionAttitudeTransform>
#include <osg/AnimationPath>
#include <osg/Matrixd>
#include <osg/PagedLOD>
#include <osg/Camera>

#include <osgGA/TrackballManipulator>
#include <osgGA/GUIEventHandler>
#include <osgGA/CameraManipulator>
#include <osgGA/StandardManipulator>
#include <osgGA/OrbitManipulator>
#include <osgGA/TrackballManipulator>

#include <osgUtil/IntersectionVisitor>
#include <osgUtil/LineSegmentIntersector>


int main()
{
    osg::ref_ptr<osgViewer::Viewer> viewer1 = new osgViewer::Viewer;
    osg::ref_ptr<osg::Group> group1 = new osg::Group;
    osg::ref_ptr<osg::Camera> camera1 = new osg::Camera;

    osg::ref_ptr<osg::Node> node1 = osgDB::readNodeFile("D:\参考手册\BIM\osg\build20190628.osgb");

    camera1->addChild(node1);
    camera1->setViewport(0, 0, 300, 220);
    camera1->setClearColor(osg::Vec4(0.0,0.0,0.0,0.0));

    group1->addChild(node1.get());
    group1->addChild(camera1.get());

    viewer1->setSceneData(group1.get());
    viewer1->setUpViewInWindow(200, 200, 800, 500, 0);

    viewer1->run();
}