Qt3D使用C++的QtQuick Scene2D

我正在尝试在Scene3D场景中呈现长方体或平面的脸部上的QML组件。我已经成功地跟随了文档中的示例，但我试图将其转换为C++ API，因为我需要处理更多的内容，只有C++就足够了。这是我的类的ctor，它根据示例代码设置实体及其组件。为了简洁，我只包含了ctor。班上没有其他任何事情会影响这一点。Qt3D使用C++的QtQuick Scene2D

ESEctoPointToast::ESEctoPointToast(Qt3DCore::QNode *parent) 
: Qt3DCore::QEntity(parent) 
, m_position(QVector3D(0,0,0)) 
, m_quickItem(nullptr) 
, m_cuboid(new Qt3DExtras::QCuboidMesh()) 
, m_textureMaterial(new Qt3DExtras::QTextureMaterial()) 
, m_transform(new Qt3DCore::QTransform()) 
, m_objectPicker(new Qt3DRender::QObjectPicker()) 
, m_texture2d(new Qt3DRender::QTexture2D()) 
, m_renderTargetOutput(new Qt3DRender::QRenderTargetOutput()) 
, m_scene2d(new Qt3DRender::Quick::QScene2D()) 
{ 
    // g_RootQmlObject is the root item in the main scene, this was the only 
    // way I could come up with to access qmlEngine. Is there a better way? 
    auto engine = qmlEngine(g_RootQmlObject); 
    QQmlComponent c(engine, QUrl("qrc:/components/E3DDummy.qml")); 
    m_quickItem = qobject_cast<QQuickItem*>(c.create()); 
    Q_ASSERT(m_quickItem); 

    m_texture2d->setWidth(256); 
    m_texture2d->setHeight(256); 
    m_texture2d->setFormat(Qt3DRender::QAbstractTexture::TextureFormat::RGB8_UNorm); 
    m_texture2d->setGenerateMipMaps(true); 
    m_texture2d->setMagnificationFilter(Qt3DRender::QAbstractTexture::Filter::Linear); 
    m_texture2d->setMinificationFilter(Qt3DRender::QAbstractTexture::Filter::LinearMipMapLinear); 
    m_texture2d->setWrapMode(Qt3DRender::QTextureWrapMode(Qt3DRender::QTextureWrapMode::ClampToEdge)); 
    m_renderTargetOutput->setAttachmentPoint(Qt3DRender::QRenderTargetOutput::AttachmentPoint::Color0); 
    m_renderTargetOutput->setTexture(m_texture2d); 
    m_textureMaterial->setTexture(m_texture2d); 
    m_scene2d->setItem(m_quickItem); 
    m_scene2d->setMouseEnabled(true); 
    m_scene2d->setRenderPolicy(Qt3DRender::Quick::QScene2D::RenderPolicy::Continuous); 
    m_scene2d->setOutput(m_renderTargetOutput); 
    m_scene2d->addEntity(this); 

    addComponent(m_transform); 
    addComponent(m_textureMaterial); 
    addComponent(m_cuboid); 
    addComponent(m_objectPicker); 
}

我将它包含在我的Scene3D中，从另一个类中渲染为黑盒子，并将无意义的红色文本挤压在脸上。显然这是不对的。我哪里错了？

这就是呈现：