QGLSphere and texture mapping (Qt5)

[spirits25]

Hi.
Sorry, but I'm bad speak English=)
I use Qt5 and Qt3D module. I created qglsphere object as in example "solarsystem":

QGLBuilder builder;
    QGLSceneNode *root = builder.sceneNode();
    QUrl url;
...
    //planetary surface
    QGLMaterial *mat2 = new QGLMaterial;
    url.setPath(QLatin1String(":/planet.jpg"));
    url.setScheme(QLatin1String("file"));
    mat2->setTextureUrl(url);
    m_LoadedTextures.push_back(mat2->texture());
    int planetMat = root->palette()->addMaterial(mat2);
...
    // create the planet
    builder.newNode()->setObjectName(QLatin1String("Planet"));
    builder<<QGLSphere(0.4);
    builder.currentNode()->setMaterialIndex(planetMat);
    builder.currentNode()->setEffect(QGL::LitModulateTexture2D);
...
    return builder.finalizedSceneNode();

QGLBuilder builder;
    QGLSceneNode *root = builder.sceneNode();
    QUrl url;
...
    //planetary surface
    QGLMaterial *mat2 = new QGLMaterial;
    url.setPath(QLatin1String(":/planet.jpg"));
    url.setScheme(QLatin1String("file"));
    mat2->setTextureUrl(url);
    m_LoadedTextures.push_back(mat2->texture());
    int planetMat = root->palette()->addMaterial(mat2);
...
    // create the planet
    builder.newNode()->setObjectName(QLatin1String("Planet"));
    builder<<QGLSphere(0.4);
    builder.currentNode()->setMaterialIndex(planetMat);
    builder.currentNode()->setEffect(QGL::LitModulateTexture2D);
...
    return builder.finalizedSceneNode();

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but I can not overlay texture on the part this sphere with any coordinates.
For example, like this
part3_sphere1.jpg

I want get random coordinates and overlay there random square texture (not to the whole sphere).
Сan anyone show an example how to do it?
thanks in advance=)