VTK + TranslucentBackground + FramelessWindow = Bug ?

[odgygsf]

Hello everyone.

I've made a program with PyQt4 that uses VTK. This bug probably occurs with QT too.

The base class of the program is a QWidget with :

self.setAttribute(QtCore.Qt.WA_TranslucentBackground, True)
self.setWindowFlags(QtCore.Qt.FramelessWindowHint)

self.setAttribute(QtCore.Qt.WA_TranslucentBackground, True)
self.setWindowFlags(QtCore.Qt.FramelessWindowHint)

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(The window has a customized titlebar and I use the transparency to show a QGraphicsDropShadowEffect)

I have a QVTKRenderWindowInteractor embed inside my application. Everything works fine without or with one of the two lines above. But with these two lines together, the QVTKRenderWindowInteractor is completly transparent (I see behind the program, like a hole). All other QWidgets such as QPushbuttons are displayed normally.

I know this may seem quite precise, but it is very frustrating.

You can probably notice this bug with any example of VTK + pyqt and adding the two lines above.

Any help is welcome

Thank you..

[odgygsf]

I found this :
https://bugreports.qt.io/browse/QTBUG-8119
https://bugs.webkit.org/show_bug.cgi?id=29482
https://bugreports.qt.io/browse/QTBUG-4483

It doesn't involve VTK but the issue seems to be the same.

[odgygsf]

OK after many tries, I may have found a lead.

I subclassed the QVTKRenderWindowInteractor and I implemented a definition for a paintEvent.

def paintEvent(self, event):
        o = QStyleOption()
        o.initFrom(self)
        p = QPainter(self)
        self.style().drawPrimitive(QStyle.PE_Widget, o, p, self)

def paintEvent(self, event):
        o = QStyleOption()
        o.initFrom(self)
        p = QPainter(self)
        self.style().drawPrimitive(QStyle.PE_Widget, o, p, self)

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With this, there is no more "hole" and the Canvas area in filled with an opaque color instead. However, there is still no 3D.
I've picked this code from http://stackoverflow.com/questions/1...widget-in-pyqt
I don't really understand the code and maybe with some modifications it would be possible to fix the issue.

Is there someone familiar with this code ?

[odgygsf]

up ?
I'm still stuck on this, it is driving me crazy...
I hope that someone can help.
Thanks in advance.

[odgygsf]

up...
I really don't know how I can deal with this.