本节演示选中3dtiles的模型，选中模型与ceisum基本一致。通过鼠标左键单击模型并将选中的模型进行高亮。使用上一节的示例，再添加鼠标左键单击事件用于选中模型。

1、修改Handler类，添加静态函数onLeftClick，参数与右键单击函数一样。单击时获取鼠标位置然后获取选中的要素再将其高亮。

static void onLeftClick(void *handler, Cesium::ScreenEvent *event) {
    Handler *aggregator = (Handler *) handler;
    glm::dvec2 position = event->position;// 获取鼠标屏幕位置
    //获取选中要素
    Cesium::Feature *feature = aggregator->viewer->_scene->pick(position);
    if (feature == NULL) {
        if (aggregator->feautre != NULL) {
            glm::dvec4 co(1.0, 1.0, 1.0, 1.0);
            aggregator->feautre->color(co);//取消高亮
        }
    } else {
        if (feature->instanceof("Cesium3DTileFeature")) {
            Cesium::Cesium3DTileFeature *tfeautre = (Cesium::Cesium3DTileFeature *) feature;// 强制类型转换
            aggregator->feautre = tfeautre;
            glm::dvec4 co(1.5, 0.0, 0.0, 0.5);
            tfeautre->color(co);//高亮模型
            aggregator->attrname.clear();
            tfeautre->getPropertyNames(&aggregator->attrname);
            std::string id = tfeautre->getProperty("batchId");
            for (int i = 0; i < aggregator->attrname.size(); i++) {
                std::cout << aggregator->attrname[i] << std::endl;//打印属性
            }
        }
    }
}

2、主函数中添加鼠标左键函数

_eventHandler>setInputAction(&Handler::onLeftClick, 

                                                 Cesium::ScreenSpaceEventType::LEFT_CLICK);

3、鼠标右键函数是添加3dtiles模型，并平移到模型位置。

4、运行即可，鼠标右键添加模型后，使用左键单击一个模型即可选中模型并高亮，点击地图其他地方就取消高亮。过程与web端cesium基本一致。

 完整代码

/**
 * Created by IBM on 2021/3/3.
 */
#include <iostream>
#include <Widgets/Viewer/Viewer.h>
#include <Scene/Cesium3DTileset.h>

class Handler {
public:
    Cesium::Viewer *viewer;
    Cesium::Cesium3DTileset *tileset = NULL;
    Cesium::Cesium3DTileFeature *feautre = NULL;
    std::vector<std::string> attrname;

    /**
    * 鼠标右键加载tileset模型
    * @param handler
    * @param event 鼠标指针位置，屏幕坐标，与ceisum中的基本一致
    */
    static void mouseUp(void *handler, Cesium::ScreenEvent *event) {
        Handler *aggregator = (Handler *) handler;
        if (aggregator->tileset == NULL) {
            std::string url = "../data/BatchedColors/tileset.json";
            aggregator->tileset = new Cesium::Cesium3DTileset(url);
            aggregator->viewer->_scene->primitives()->add(aggregator->tileset);
            Cesium::HeadingPitchRoll *orientation = new Cesium::HeadingPitchRoll(0.0, -1.5707963267948966, 0.0);
            //因为已经有glm库使用没有写cesium的Cartesian3，但是Cartesian3的很多方法是写了的，也可以用glm库提供的
            glm::dvec3 initialPosition1 = Cesium::Cartesian3::fromDegrees(-75.60908200128681, 40.04159868719826, 1000);
            aggregator->viewer->_scene->_camera->setView(orientation, initialPosition1);

        }
    }

    static void onLeftClick(void *handler, Cesium::ScreenEvent *event) {
        Handler *aggregator = (Handler *) handler;
        glm::dvec2 position = event->position;// 获取鼠标屏幕位置
        //获取选中要素
        Cesium::Feature *feature = aggregator->viewer->_scene->pick(position);
        if (feature == NULL) {
            if (aggregator->feautre != NULL) {
                glm::dvec4 co(1.0, 1.0, 1.0, 1.0);
                aggregator->feautre->color(co);//取消高亮
            }
        } else {
            if (feature->instanceof("Cesium3DTileFeature")) {
                Cesium::Cesium3DTileFeature *tfeautre = (Cesium::Cesium3DTileFeature *) feature;// 强制类型转换
                aggregator->feautre = tfeautre;
                glm::dvec4 co(1.5, 0.0, 0.0, 0.5);
                tfeautre->color(co);//高亮模型
                aggregator->attrname.clear();
                tfeautre->getPropertyNames(&aggregator->attrname);
                std::string id = tfeautre->getProperty("batchId");
                for (int i = 0; i < aggregator->attrname.size(); i++) {
                    std::cout << aggregator->attrname[i] << std::endl;//打印属性
                }
            }
        }
    }
};

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::RIGHT_CLICK);//设置鼠标点击事件
    _eventHandler->setInputAction(&Handler::onLeftClick, Cesium::ScreenSpaceEventType::LEFT_CLICK);
    viewer.startAnimating(true);//启动opengl循环
    system("pause");
    return 0;
}

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