Render transparent 2D image on mesh Qt3D

PVRT

I am new to Qt3D and I am trying to figure out a way to render a 2D image on top of a mesh and also control the transparency of the 2D image.

I googled for it but could not find any solution. Looking at some of the examples provided with Qt i was able to display a 2D image on top as mesh by adding a plane (with image texture) above it. Is this the best way to do it? Are there any alternate ways?

#include <QtGui/QGuiApplication>

#include <Qt3DCore/QEntity>
#include <Qt3DCore/QTransform>

#include <Qt3DExtras/Qt3DWindow>
#include <Qt3DExtras/QPhongMaterial>
#include <Qt3DExtras/QSphereMesh>
#include <Qt3DExtras/QTorusMesh>
#include <Qt3DExtras/QOrbitCameraController>
#include <Qt3DExtras/QDiffuseSpecularMaterial>
#include <Qt3DExtras/QPlaneMesh>
#include <Qt3DExtras/QFirstPersonCameraController>

#include <Qt3DRender/QCamera>
#include <Qt3DRender/QTexture>
#include <Qt3DRender/QTextureImage>

Qt3DCore::QEntity* createScene()
{
    auto rootEntity = new Qt3DCore::QEntity;

    auto material = new Qt3DExtras::QPhongMaterial(rootEntity);
    material->setDiffuse(QColor(QRgb(0x928327)));
    material->setAmbient(QColor(QRgb(0x928327)));

    Qt3DCore::QEntity *sphereEntity = new Qt3DCore::QEntity(rootEntity);
    Qt3DExtras::QSphereMesh *sphereMesh = new Qt3DExtras::QSphereMesh;
    sphereMesh->setRadius(3);
    sphereMesh->setGenerateTangents(true);

    Qt3DCore::QTransform *sphereTransform = new Qt3DCore::QTransform;
    sphereEntity->addComponent(sphereMesh);
    sphereEntity->addComponent(sphereTransform);
    sphereEntity->addComponent(material);

    // Plane shape data
    Qt3DExtras::QPlaneMesh *planeMesh = new Qt3DExtras::QPlaneMesh();
    planeMesh->setWidth(2);
    planeMesh->setHeight(2);

    Qt3DCore::QTransform *planeTransform = new Qt3DCore::QTransform();
    planeTransform->setScale(0.5f);
    planeTransform->setRotation(QQuaternion::fromAxisAndAngle(QVector3D(1.0f, 0.0f, 0.0f), 90));
    planeTransform->setTranslation(QVector3D(0.0f, 0.0f, 10.0f));

    auto textureImage = new Qt3DRender::QTextureImage;
    textureImage->setSource(QUrl(QStringLiteral("qrc:/new/prefix1/img")));
    auto planeImage = new Qt3DRender::QTexture2D();
    planeImage->addTextureImage(textureImage);
    auto planeMaterial = new Qt3DExtras::QDiffuseSpecularMaterial();
    planeMaterial->setDiffuse(QVariant::fromValue(planeImage));
    planeMaterial->setNormal(QVariant::fromValue(planeImage));
    planeMaterial->setSpecular(QVariant::fromValue(planeImage));

    planeMaterial->setShininess(1.0f);
    // Plane
    {
        auto m_planeEntity = new Qt3DCore::QEntity(rootEntity);
        m_planeEntity->addComponent(planeMesh);
        m_planeEntity->addComponent(planeMaterial);
        m_planeEntity->addComponent(planeTransform);
    }

    return rootEntity;
}

int main(int argc, char** argv)
{
    QGuiApplication a(argc, argv);

    Qt3DExtras::Qt3DWindow view;

    // Camera
    Qt3DRender::QCamera *camera = view.camera();
    camera->lens()->setPerspectiveProjection(45.0f, 16.0f / 9.0f, 0.1f, 1000.0f);
    camera->setPosition(QVector3D(0, 0, 40.0f));
    camera->setViewCenter(QVector3D(0, 0, 0));

    auto scene = createScene();
    // For camera controls
    auto camController = new Qt3DExtras::QFirstPersonCameraController(scene);
    camController->setCamera(camera);


    view.setRootEntity(scene);
    view.show();

    return a.exec();
}

Is there a way to control the transparency of mesh with image texture?

Thank you in advance.