Unable to texture with an image a subnode read from a 3D model using QGLMaterial

 
// Read in the 3D model, 
QGLAbstractScene *m_modelScene = QGLAbstractScene::loadScene(fileName);

// This will print: ("smartphone.3DS", "<3DSRoot>", "phone", "button", "screen", "phone::m_phone", "button::m_button", "screen::m_screen") 
qDebug() << m_modelScene->objectNames(); 

// Access the main node and the subnode that we want to texture.
QGLSceneNode *m_meshObject = m_modelScene->mainNode();
QSceneNode *displayNode = qobject_cast<QGLSceneNode *>(m_modelScene->object(QLatin1String("screen")));

// Create the texture we want to apply to the subnode "screen". Use existing image for texturing. 
QGLMaterial *materialTexture = new QGLMaterial(this);
QUrl url;
url.setPath(QLatin1String(":/smartp0.png"));
url.setScheme(QLatin1String("file"));
materialTexture->setTextureUrl(url);

// Set the texturing material and draw the model.
displayNode->setMaterial(materialTexture);
m_meshObject->draw(painter);