osgearth设置倾斜摄影的代码

以下是一个osgEarth设置倾斜摄影的示例代码：

#include <osgEarth/Map>
#include <osgEarth/MapNode>
#include <osgEarth/GeoTransform>
#include <osgEarth/VerticalOffset>
#include <osgEarthUtil/TMS>
#include <osgEarthUtil/Sky>
#include <osgEarthUtil/EarthManipulator>

#include <osgViewer/Viewer>

using namespace osgEarth;
using namespace osgEarth::Util;

int main(int argc, char** argv)
{
    // 创建一个地图对象
    Map* map = new Map();

    // 添加TMS图层
    TMSImageLayerOptions layerOptions("My TMS Layer", "http://myserver.com/mytms/{z}/{x}/{y}.jpg");
    map->addImageLayer(new TMSImageLayer(layerOptions));

    // 创建地图场景
    osg::ref_ptr<MapNode> mapNode = new MapNode(map);

    // 创建地球变换节点
    osg::ref_ptr<GeoTransform> geoTransform = new GeoTransform();
    geoTransform->setPosition(osgEarth::GeoPoint(osgEarth::SpatialReference::create("wgs84"), 0, 0, 0, osgEarth::ALTMODE_ABSOLUTE));

    // 将地球变换节点添加到地图场景中
    osg::ref_ptr<osg::Group> root = new osg::Group();
    root->addChild(geoTransform.get());
    root->addChild(mapNode.get());

    // 设置地球倾斜视图
    osg::ref_ptr<osgEarth::Util::EarthManipulator> manip = new EarthManipulator();
    manip->setViewpoint(osgEarth::Viewpoint("tilted", 0, -90, 10000000));
    osg::ref_ptr<osgViewer::Viewer> viewer = new osgViewer::Viewer();
    viewer->setCameraManipulator(manip.get());

    // 添加天空和光照
    osg::ref_ptr<osgEarth::Util::SkyNode> skyNode = new osgEarth::Util::SkyNode();
    skyNode->attach(viewer->getCamera());
    viewer->setSceneData(skyNode.get());

    // 显示场景
    viewer->setSceneData(root.get());
    return viewer->run();
}