c++使用qt解析并显示VRML模型

要在C++中使用Qt解析和显示VRML模型，需要使用Qt提供的3D图形框架——Qt 3D。Qt 3D提供了一个方便的API来创建和渲染3D场景。

以下是一个简单的示例代码，用于加载和显示VRML模型：

#include <Qt3DExtras/Qt3DWindow>
#include <Qt3DExtras/QForwardRenderer>
#include <Qt3DCore/QEntity>
#include <Qt3DRender/QCamera>
#include <Qt3DRender/QPointLight>
#include <Qt3DRender/QMesh>
#include <Qt3DExtras/QPhongMaterial>

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

    // create a window for the 3D scene
    Qt3DExtras::Qt3DWindow view;
    view.defaultFrameGraph()->setClearColor(QColor(QRgb(0x4d4d4f)));

    // create a root entity
    Qt3DCore::QEntity *rootEntity = new Qt3DCore::QEntity;

    // create a camera entity
    Qt3DRender::QCamera *cameraEntity = view.camera();
    cameraEntity->setPosition(QVector3D(0, 0, 5));
    cameraEntity->setViewCenter(QVector3D(0, 0, 0));

    // create a light entity
    Qt3DRender::QPointLight *lightEntity = new Qt3DRender::QPointLight(rootEntity);
    lightEntity->setIntensity(1);
    lightEntity->setColor("white");
    lightEntity->setLocalPosition(QVector3D(0, 0, 2));

    // create a mesh entity
    Qt3DRender::QMesh *meshEntity = new Qt3DRender::QMesh(rootEntity);
    meshEntity->setSource(QUrl::fromLocalFile("model.wrl"));

    // create a material entity
    Qt3DExtras::QPhongMaterial *materialEntity = new Qt3DExtras::QPhongMaterial(rootEntity);
    materialEntity->setDiffuse(QColor(QRgb(0x928327)));

    // add the entities to the root entity
    rootEntity->addComponent(cameraEntity);
    rootEntity->addComponent(lightEntity);
    rootEntity->addComponent(meshEntity);
    rootEntity->addComponent(materialEntity);

    // set the root entity as the scene root
    view.setRootEntity(rootEntity);

    // show the 3D scene window
    view.show();

    return app.exec();
}

请注意，这只是一个基本示例，您可能需要根据您的实际需求进行更改。另外，还需要根据Qt 3D的文档了解更多关于如何使用它来加载和渲染VRML模型的信息。