OSG在QT的中显示之一

以前写过关于OSG的一些文章，主要是以基础为主，可是结合QT来显示尚未写过。web

OSG和QT结合显示有单独的类：GraphicsWindowQt。若是编译过程当中没有把这个类编译成库文件，能够直接在源码中拷贝出来，把头文件和cpp文件修改一下文件名就能够了，而后把修改好的.h和.cpp加入到工程中。缓存

环境：VS2015+QT5.10+64位+OSG3.5.1svg

1. 把环境设置好，头文件目录、连接文件目录在VS2015中配置好。
2. 把连接文件添加上：

#pragma once

#ifdef _DEBUG
#pragma comment(lib, "osgd.lib")
#pragma comment(lib, "osgDBd.lib")
#pragma comment(lib, "osgFXd.lib")
#pragma comment(lib, "osgViewerd.lib")
#pragma comment(lib, "OpenThreadsd.lib")
#pragma comment(lib, "osgGAd.lib")
#pragma comment(lib, "osgUtild.lib")
#pragma comment(lib, "osgTextd.lib")
#pragma comment(lib, "osgWidgetd.lib")
#pragma comment(lib, "osgShadowd.lib")
#pragma comment(lib, "osgAnimationd.lib")
#pragma comment(lib, "osgParticled.lib")
#pragma comment(lib, "osgManipulatord.lib")

#pragma comment(lib, "osgSim.lib")

#pragma comment(lib, "osgEarthd.lib")
#pragma comment(lib, "osgEarthUtild.lib")
#pragma comment(lib, "osgEarthFeaturesd.lib")
#pragma comment(lib, "osgEarthSymbologyd.lib")

#pragma comment(lib, "CEGUIBase_d.lib")
#pragma comment(lib, "CEGUIOpenGLRenderer_d.lib")
#pragma comment(lib, "CEGUILuaScriptModule_d.lib")
#pragma comment(lib, "glu32.lib") 
#pragma comment(lib, "opengl32.lib")

#else
#pragma comment(lib, "osg.lib")
#pragma comment(lib, "osgDB.lib")
#pragma comment(lib, "osgFX.lib")
#pragma comment(lib, "osgViewer.lib")
#pragma comment(lib, "OpenThreads.lib")
#pragma comment(lib, "osgGA.lib")
#pragma comment(lib, "osgUtil.lib")
#pragma comment(lib, "osgText.lib")
#pragma comment(lib, "osgWidget.lib")

#pragma comment(lib, "osgShadow.lib")
#pragma comment(lib, "osgAnimation.lib")
#pragma comment(lib, "osgParticle.lib")
#pragma comment(lib, "osgManipulator.lib")

#pragma comment(lib, "osgSim.lib")

#pragma comment(lib, "osgEarth.lib")
#pragma comment(lib, "osgEarthUtil.lib")
#pragma comment(lib, "osgEarthFeatures.lib")
#pragma comment(lib, "osgEarthSymbology.lib")
#pragma comment(lib, "osgEarthAnnotation.lib")
#pragma comment(lib, "osgEarthSplat.lib")

#endif

3. 设置两个变量

QTimer* _timer;
	osgViewer::Viewer viewer;

4. 初始化OSG场景及其相关

void OSG::initOSG() {
	//设置模型
	osg::ref_ptr<osg::Group> root = new osg::Group;
	osg::ref_ptr<osg::Node> child = osgDB::readNodeFile("cow.osg");
	root->addChild(child);

	osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits;
	traits->windowDecoration = false;//声明是否显示窗口的描述
	traits->x = 50;
	traits->y = 50;
	traits->width = 800;
	traits->height = 600;
	traits->doubleBuffer = true;//建立图形窗口是否使用双缓存

	//设置照相机
	osg::ref_ptr<osg::Camera> camera = new osg::Camera;
	camera->setGraphicsContext(new GraphicsWindowQt(traits.get()));
	camera->setClearColor(osg::Vec4(0.2, 0.2, 0.6, 1.0));
	camera->setViewport(new osg::Viewport(0, 0, 800, 600));
	camera->setProjectionMatrixAsPerspective(30.0f, 800.0f/600.0f, 1.0f, 10000.0f);

	//设置渲染器
	viewer.setCamera(camera);
	viewer.setSceneData(root);
	viewer.setCameraManipulator(new osgGA::TrackballManipulator);
	viewer.setThreadingModel(osgViewer::Viewer::SingleThreaded);//建立为单线程
	viewer.addEventHandler(new osgGA::StateSetManipulator(viewer.getCamera()->getOrCreateStateSet()));
	viewer.addEventHandler(new osgViewer::WindowSizeHandler);
	viewer.addEventHandler(new osgViewer::StatsHandler);

	GraphicsWindowQt* gw = dynamic_cast<GraphicsWindowQt*> (camera->getGraphicsContext());

	ui.horizontalLayoutOSG->addWidget(gw->getGLWidget());

	_timer = new QTimer;
	connect(_timer, SIGNAL(timeout()), this, SLOT(slotUpdate()));
	_timer->start(25);
}

void OSG::slotUpdate() {
	viewer.frame();
}

5. UI文件
   
6. 运行结果：
   aaa