QAbstract3DSeries::setBaseColor does not support transparent colors

QAbstract3DSeries::setBaseColor  does not support transparent colors and sets alpha to 255, therefore its impossible to create semi transparent or transparent  surface.

Example:

1)

no modification, default theme:

2)

series->setBaseColor(QColor(255, 0, 0, 128)); will produce:

3)

series->setBaseColor(QColor(255, 0, 0, 255));  will produce:

4)

        series->setBaseColor(QColor(255, 0, 0, 0));  will produce: