QGraphicsScene Composition modes

[StudentScripter]

I want to paint a black rect all over the graphicsscene, add some white holes and set the composition mode in that way that the more white a array is the more transparent it gets, showing the contents below. Whats the best way to do this?

I tried qpainter in draw foreground with multiply on my graphicsscene, but this won't show the items below. Adding a new qgraphicsitem and doing this in its paint statement hasn't worked neither. Am i missing some flags or something?

Appreciate any hints. :)

[Pl45m4]

@StudentScripter

Have you already tried the Composition Mode Example or the Image Composition Example?

Am i missing some flags or something

QPainter::CompositionMode?!

• https://doc.qt.io/qt-6/qpainter.html#CompositionMode-enum

[StudentScripter]

@Pl45m4 Yeah forgot to set opacity to something else than 1, that solved it...