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    • UNSOLVED Qt5.12.10 iOS QDrag pixmap transparency
      Mobile and Embedded • drag and drop transparency pixmap ios ipad • • Flock Andrew  

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    • UNSOLVED Transparent texture using QT OpenGL
      Mobile and Embedded • transparency texture 3d model qtopengl • • ishi  

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    • SOLVED Transparency does not work on Qt 5-5.15.2-1
      General and Desktop • transparency • • Banjo 0  

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      For anyone who finds this later because they have the same issue, I have actually found a workaround that fixes the problem. Evidently the back end of the Plasma compositor defaults to OpenGL 2.0, and that is not working anymore. If I set the compositor backend to XRender the transparency works again. The workaround is System Settings => Display and Monitor => Compositor Then, for the Rendering backend: select XRender.
    • UNSOLVED Copying PNG with alpha channel to the clipboard is not working on windows. How can I fix this?
      General and Desktop • transparency copy png clipboard alpha channel • • derekleesoft  

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    • UNSOLVED WebEngine - How to draw an animated SVG above a transparent web view?
      QtWebEngine • webengine svg background transparency • • jeanmilost  

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    • UNSOLVED Is it possible to view background color or other widgets behind QGLWidget by using transparent GL background (glClearColor)?
      General and Desktop • background transparency qglwidget alpha • • thehans  

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    • UNSOLVED QOpenGLWidget::grabFrameBuffer() always ignores alpha channel?
      General and Desktop • qopenglwidget transparency qglwidget alpha grabframebuffer • • thehans  

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      @thehans said in QOpenGLWidget::grabFrameBuffer() always ignores alpha channel?: Unfortunately I'm on Ubuntu 18.04 which is still on 5.9.5. Is there any chance of this fix being backported to earlier versions? Qt 5.9 is now in "very strict" update mode, which means in only receives security fixes. It no longer receives bug fixes. Your options are: Download and use Qt 5.12 or newer from https://www.qt.io/download-open-source, OR Apply the patch to your copy of Qt 5.9 and build it from source. I think the first option is easier.
    • SOLVED Displaying widgets on top of Opengl widget (Ogre engine)
      General and Desktop • opengl transparency ogre • • gabbsson  

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      @SGaist My solution is heavily inspired by: this old ogre wiki post (should have linked it as well, forgot about it until now). I mostly slimmed it down to what I posted as my solution, but I agree if I have time I'll try to make an example/entry. There are some things that need to be updated from the linked post to fit Ogre 2.1 since the post is old.
    • UNSOLVED QT3D, multisample texture
      General and Desktop • c++ opengl transparency • • skybig  

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      I think you have to add a QMultiSampleAntiAliasing to either a QRenderStateSet or a QRenderPassFilter. Did you also enable it in the OpenGL format that you set?
    • UNSOLVED How to create few transparent, z-order independent QGraphicsItem?
      General and Desktop • qgraphicsitem transparency scene opacity z-order • • flart  

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      @kenchan I knew that. I want not stacking by z-order, I want simultaneous stacking. It works something like that by default (if opacity of items is 0.5 ) output = Merge(Merge(background, 0.5 × item1), 0.5 × item2) I want something like that output = Merge(background, 0.5 × item1, 0.5 × item2) aka simultaneous merge items to scene, so it not depends from z-order. (example — I want ⅓ background, ⅓ item1 and ⅓ item2, Indifferently to items z-order)
    • UNSOLVED Can I make an item be rendered when an ancestor of it has opacity 0?
      QML and Qt Quick • transparency visibility opacity translucent culling • • Stefan Monov76  

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    • UNSOLVED GIF and usability of transparency...
      General and Desktop • transparency gif • • scralings  

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      @mrjj No, but I will.
    • UNSOLVED Qt 5.5 LinuxFb Plugin with Base Layer Transparency
      Mobile and Embedded • qt5.5 transparency framebuffer linuxfb translucent • • PhilBot9999  

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      I did register but realized I posted with the wrong email address. Now I've corrected it and can see my post on the list. Thank you.
    • UNSOLVED OS X: Clicks on fully transparent parts of windows no longer passes through in Qt 5.6
      General and Desktop • qwidget qt5.6 transparency frameless • • Guy Gizmo  

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      Thanks for sharing !
    • UNSOLVED Semi-transparency of QDialog as Popup doesn't work
      Mobile and Embedded • linux qdialog transparency qt embedded qt5.3.2 • • niko  

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    • QGLWidget/QOpenGLWidget with transparent background
      General and Desktop • opengl qopenglwidget background transparency qglwidget transparent overlay alpha translucent see throught • • FredeHo  

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    • QLabel pixmap not clearing
      General and Desktop • qlabel qpixmap transparency qt 4.8 • • Tymer  

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    • QOpenGLWidget and transparency
      General and Desktop • qt5.5 qopenglwidget transparency • • Flassie  

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      Hi, It is a limitation. http://doc.qt.io/qt-5/qopenglwidget.html "Limitations Putting other widgets underneath and making the QOpenGLWidget transparent will not lead to the expected results: The widgets underneath will not be visible. This is because in practice the QOpenGLWidget is drawn before all other regular, non-OpenGL widgets, and so see-through type of solutions are not feasible. Other type of layouts, like having widgets on top of the QOpenGLWidget, will function as expected." You have to use Qt::WA_AlwaysStackOnTop to do this.
    • How to play video with alpha channel
      QML and Qt Quick • video transparency webm alpha overlap • • charlycoste  

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    • Translucent window with click-through behaviour
      General and Desktop • window transparency click translucent through • • Rphysx  

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      Win7 & Qt 5.4.2 with QtCreator 3.4.1
    • Transparent effect is not working in Qt5
      Mobile and Embedded • linux arm transparency qt5 vs qt4 • • Ava6  

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      @SGaist Thanks. I'll give it a look.
    • Transparent background and opaque rectangles
      QML and Qt Quick • qml opengl transparency opacity • • Juaruipav  

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      @Juaruipav Yes it is activated. Did you try by deactivating it ? May be it is a bug on Windows 8.1. Better you should report it on Qt Bug Tracker.
    • Displaying a QWidget with Transparent Background over a QMediaPlayer
      General and Desktop • qwidget transparency qmultimedia • • tmason202  

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      @tmason202 , try this one void QTSemiTransparentWidget::paintEvent(QPaintEvent* event) { QPainter painter(this); painter.setOpacity(0.5); QStyleOption opt; opt.initFrom(this); QStyle* pStyle = QApplication::style(); pStyle->drawPrimitive(QStyle::PE_Widget, &opt, &painter, this); } at least you should draw something in paint event not to just set an opacity.
    • QMdiSubWindow with transparency and opacity
      General and Desktop • css transparency qmdisubwindow qmdiarea opacity • • scastiello  

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      Yes of course