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杭州有名的纯设计公司,seo自学教程,开发一款游戏需要多少钱,卖网站赚钱吗简介使用OpenSceneGraph (osg)实现了一个太阳系漫游的程序，具有以下特点： 1.通过按键控制飞行器前进后退、空间姿态； 2.星系渲染； 3.背景星空渲染； 效果提供了一张超大的星空背景图代码示例 int main(int a…

简介

使用OpenSceneGraph (osg)实现了一个太阳系漫游的程序，具有以下特点：

1.通过按键控制飞行器前进后退、空间姿态；

2.星系渲染；

3.背景星空渲染；

效果

提供了一张超大的星空背景图

代码示例

int main(int argc, char *argv[])
{// 创建场景根节点osg::ref_ptr<osg::Group> root = new osg::Group;root->addChild(createSun());root->addChild(createMercury());root->addChild(createVenus());root->addChild(createEarth());root->addChild(createMars());root->addChild(createJupiter());root->addChild(createSaturn());root->addChild(createUranus());root->addChild(createNeptune());root->addChild(createSkyBox());osg::ref_ptr<osg::MatrixTransform> airplaneTransform = new osg::MatrixTransform;osg::Vec3 craftPos(0, -40, 0);airplaneTransform->addChild(createAircraft()); // 或加载外部模型root->addChild(airplaneTransform);osgViewer::Viewer viewer;viewer.setSceneData(root.get());AircraftController* ac=new AircraftController(airplaneTransform.get());ac->setViewer(&viewer);ac->initCamera(craftPos);viewer.addEventHandler(ac);viewer.setUpViewInWindow(100, 100, 1200, 1000);// 2. 创建 HUD 相机osg::Camera* hudCamera = createHUDCamera(1200, 1000); // 假设窗口大小为 1280x720osg::ref_ptr<osg::Geode> hudGeode = new osg::Geode;// // 3. 添加状态文字到 HUDosgText::Text* statusText = createStatusText("", 1200, 20); // 右下角位置AircraftHudTextCallback* acHudCb=new AircraftHudTextCallback(airplaneTransform.get());statusText->setUpdateCallback(acHudCb);hudGeode->addDrawable(statusText);hudCamera->addChild(hudGeode);// 4. 将 HUD 相机添加到场景root->addChild(hudCamera);// viewer.setLightingMode( osg::View::SKY_LIGHT );while(!viewer.done()){viewer.frame();} // return viewer.run();
}

osg::ref_ptr<osg::Node> createSun()
{osg::ref_ptr<osg::Sphere> sphere = new osg::Sphere(osg::Vec3(0, 0, 0), 1);osg::ref_ptr<osg::ShapeDrawable> sphereDrawable = new osg::ShapeDrawable(sphere);sphereDrawable->setColor(osg::Vec4(1.0, 0.6, 0.4, 1.0));osg::ref_ptr<osg::Geode> geode = new osg::Geode;geode->addDrawable(sphereDrawable);// 加载纹理// 设置渲染状态osg::ref_ptr<osg::StateSet> stateSet = geode->getOrCreateStateSet();stateSet->setTextureAttributeAndModes(0, create_texture("sun.jpg"));// 创建 MatrixTransform 节点osg::ref_ptr<osg::MatrixTransform> transform = new osg::MatrixTransform;// 将球体添加到变换节点transform->addChild(geode);// 创建回调并附加到变换节点transform->setUpdateCallback(new SpinCallback(0.001*velocityRate,osg::Vec3(0, 0, 1)));return transform;
}

osg::ref_ptr<osg::Node> createJupiter()
{std::string name="Jupiter";osg::ref_ptr<osg::Sphere> sphere =new osg::Sphere(osg::Vec3(0, 0, 0), get_param(name,"size"));osg::ref_ptr<osg::ShapeDrawable> sphereDrawable = new osg::ShapeDrawable(sphere);sphereDrawable->setColor(osg::Vec4(0.95, 0.86, 0.54, 1.0));osg::ref_ptr<osg::Geode> geode = new osg::Geode;geode->addDrawable(sphereDrawable);// 加载纹理// 设置渲染状态osg::ref_ptr<osg::StateSet> stateSet = geode->getOrCreateStateSet();stateSet->setTextureAttributeAndModes(0, create_texture("jupiter.jpg"));//double inner_radius=3/1.8*get_param(name,"size");double outer_radius=4.2/1.8*get_param(name,"size");osg::ref_ptr<osg::Geometry> ringGeometry=createRingGeometry(inner_radius,outer_radius,64);// ringGeometry->setColor(osg::Vec4(0.95, 0.86, 0.54, 0.9));osg::ref_ptr<osg::Geode> geode2=new osg::Geode;geode2->addDrawable(ringGeometry);osg::ref_ptr<osg::MatrixTransform> transform = new osg::MatrixTransform;transform->addChild(geode);transform->addChild(geode2);OrbitAndSpinCallback* cb=new OrbitAndSpinCallback();cb->setInit(get_param(name,"leanAngle"),osg::Vec3(0,1,0));cb->setOrbit(get_param(name,"orbitAngleVelocity"),get_param(name,"orbitRadius"),osg::Vec3(0, 0, 1.0));cb->setSpin(get_param(name,"spinAngleVelocity"),osg::Vec3(tan(get_param(name,"leanAngle")), 0, 1));transform->setUpdateCallback(cb);osg::ref_ptr<osg::Group> group = new osg::Group;group->addChild(createMoon("Lo",cb));group->addChild(createMoon("Europa",cb));group->addChild(createMoon("Callisto",cb));group->addChild(createMoon("Ganymede",cb));group->addChild(transform);print_plannet_info(name);return group;    
}