QtDataVisualization - semi-transparent QSurface3DSeries

jarex

Hello dear community! I need render two figures (ellipsoids) which can cross, so it must be semi-transparent. To solve my problem I tried to use Q3DSurface and QSurface3DSerier with setting baseColor property for the QSurface3DSeries with alpha value. But It doesn't work for me.
I made some test (low-cost) project, with drawing "roof", to try accepting alpha values, but that doesn't work either.

Test code:

// Init memory
  Q3DSurface *poSurface = new Q3DSurface();
  QSurface3DSeries *poSeries = new QSurface3DSeries();
  QSurfaceDataArray *poDataArray = new QSurfaceDataArray();

  // Generating test surface series
  for ( int i = 0, k = 0; i < 10; ++i)
  {
    QSurfaceDataRow *poRow = new QSurfaceDataRow();

    for ( int j = 0; j < 10; ++j )
    {
      float x = j;
      float y = i;
      float z = k;
      poRow->append( QSurfaceDataItem( QVector3D( x, y, z ) ) );
    }
    poDataArray->append( poRow );

    if ( i % 2 == 0 )
    {
      ++k;
    }
  }

  //
  poSeries->dataProxy()->resetArray( poDataArray );
  poSurface->addSeries( poSeries );

  // Setting color with alpha value
  poSeries->setBaseColor( QColor( 100, 100, 100, 100 ));

  // Show surface widget
  QWidget *poWidget = QWidget::createWindowContainer( poSurface );
  poWidget->setWindowTitle( "test ");
  poWidget->show();

I expected to see semi-transparent gray surface, but...
alt text

What I have to do, to make my surfaces semi-transparent? Thanks!