Qt3D Opacity control on primitives?

[fireking]

How to I set level of opacity when rendering QGLSphere or QGLCube primitives?

I'm building geometry using QGLBuilder:
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QGLBuilder builder;
builder << QGL::Faceted;

if ( currentShape == sphere )
    builder << QGLSphere(0.99,3);  // size of 1, smooth
else if ( currentShape == cube )
    builder << QGLCube(1.0);  // size of 1, smooth

// Finalise geometry and get QGLSceneNode pointer.
QGLSceneNode *thisNode = builder.finalizedSceneNode();

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[fireking]

Figured it out... use alpha blending with color.

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void CubeView::initializeGL(QGLPainter *painter)
{
glEnable(GL_BLEND);
}
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and setAlpha in paintGL...

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QColor colour = QColor(VisualDataItem->getFinalColour());
colour.setAlpha(127);
painter->setFaceColor(QGL::AllFaces, colour);

VisualDataItem->getNode()->draw(painter);
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