Qt3d:围绕对象旋转摄影机(C++)

#include <QGuiApplication>
#include <Qt3DExtras/Qt3DWindow>
#include <Qt3DExtras/QOrbitCameraController>
#include <Qt3DCore/QEntity>
#include <Qt3DRender/QMesh>
#include <Qt3DExtras/QSphereMesh>
#include <Qt3DExtras/QPhongMaterial>

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);

    // 创建一个Qt3D窗口
    Qt3DWindow view;

    // 创建一个根实体
    Qt3DCore::QEntity *rootEntity = new Qt3DCore::QEntity();

    // 创建一个球体实体
    Qt3DCore::QEntity *sphereEntity = new Qt3DCore::QEntity(rootEntity);

    // 创建一个球体网格
    Qt3DExtras::QSphereMesh *sphereMesh = new Qt3DExtras::QSphereMesh();
    sphereMesh->setRadius(1);
    sphereMesh->setRings(100);
    sphereMesh->setSlices(20);

    // 创建一个材质
    Qt3DExtras::QPhongMaterial *material = new Qt3DExtras::QPhongMaterial();
    material->setDiffuse(QColor(QRgb(0xbeb32b)));

    // 将网格和材质添加到球体实体
    sphereEntity->addComponent(sphereMesh);
    sphereEntity->addComponent(material);

    // 创建一个轨道摄像机控制器
    Qt3DExtras::QOrbitCameraController *camController = new Qt3DExtras::QOrbitCameraController(rootEntity);

    // 设置摄像机的位置
    camController->setCameraPosition(QVector3D(0, 0, 40.0f));
    camController->setLookSpeed(100.0f);
    camController->setZoomSpeed(10.0f);

    // 将根实体添加到场景中
    view.setRootEntity(rootEntity);

    // 显示窗口
    view.show();

    return app.exec();
}