How to create meshGradient (2-dimensional gradient)?

[flart]

Some linearGradient code (1-dim) , but meshes (2-dim, example below) are needed.

    QLinearGradient linearGrad(screen.topLeft(), screen.bottomRight());
 
    QColor c1 = QColor::fromHsvF(0.3, 1, 0.3);
    QColor c2 = QColor::fromHsvF(0.4, 1, 0.5);
    QColor c3 = QColor::fromHsvF(0.5, 1, 0.3);

    linearGrad.setColorAt(0.1, c1);
    linearGrad.setColorAt(0.5, c2);
    linearGrad.setColorAt(0.9, c3);

    myscene->setBackgroundBrush(QBrush(linearGrad));

mesh examples:

How to create mesh-gradient-background for scene?