本节演示使用CCsium库加载cesium的世界地形，使用第四节单击事件的例子，修改点击事件添加地形。

1、ceisum显示地形需要引入CesiumTerrainProvider和CreateWorldTerrain类。与ceisum类似，修改鼠标点击事件，创建地形并添加到ceisum中。

if (aggregator->terrain == NULL) {aggregator->terrain = Cesium::CreateWorldTerrain::createWorldTerrain();aggregator->viewer->terrainProvider(aggregator->terrain);
}

支持地形下载

2、点击运行，左键单击即可看到地形

完整代码

/*** Created by IBM on 2021/3/3.*/
#include <iostream>
#include <Widgets/Viewer/Viewer.h>
#include <Core/CesiumTerrainProvider.h>
#include <Core/CreateWorldTerrain.h>class Handler {
public:Cesium::Viewer *viewer;Cesium::CesiumTerrainProvider *terrain = NULL;/*** 鼠标抬起事件* @param type* @param position*/static void mouseUp(void *handler, Cesium::ScreenEvent *event) {Handler *aggregator = (Handler *) handler;if (aggregator->terrain == NULL) {aggregator->terrain = Cesium::CreateWorldTerrain::createWorldTerrain();aggregator->viewer->terrainProvider(aggregator->terrain);}}
};int main(int argc, char *argv[]) {Handler *handler = new Handler();Cesium::Viewer viewer = Cesium::Viewer(500, 300);handler->viewer = &viewer;std::string url = "https://dev.virtualearth.net";std::string key = "AmXdbd8UeUJtaRSn7yVwyXgQlBBUqliLbHpgn2c76DfuHwAXfRrgS5qwfHU6Rhm8";Cesium::BingMapsImageryProvider *imageryProvider1 = new Cesium::BingMapsImageryProvider(url, key);viewer.imageryLayers()->addImageryProvider(imageryProvider1);//创建事件Cesium::ScreenSpaceEventHandler *_eventHandler = new Cesium::ScreenSpaceEventHandler(handler);_eventHandler->setInputAction(&Handler::mouseUp, Cesium::ScreenSpaceEventType::LEFT_CLICK);//设置鼠标点击事件viewer.startAnimating(true);//启动opengl循环system("pause");return 0;
}

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