Quick3D fails with software render backend

[alic]

When I run my Qt project inside a docker container with the environment variable Qt_quick_backend=software (possibly related to https://bugreports.qt.io/browse/QTBUG-102634), the application runs but does not display any QtQuick 3D object. If I remove the Qt_quick_backend environment variable, the application gives a OpenGL segmentation fault error. When the application runs outside the docker container, i.e., locally, it works.

I'm using Qt 6.2.3, C++, my OS is Ubuntu and the docker container is run with the following options: "xhost +local:", "--net host", "-e DISPLAY", "-e QT_QUICK_BACKEND=software", "-v /tmp/.X11-unix:/tmp/.X11-unix"

This is the OpenGL segmentation fault output:

qt.scenegraph.general: Using QRhi with backend OpenGL
  Graphics API debug/validation layers: 0
  QRhi profiling and debug markers: 0
  Shader/pipeline cache collection: 0
qt.scenegraph.general: threaded render loop
qt.scenegraph.general: Using sg animation driver
qt.scenegraph.general: Animation Driver: using vsync: 16.67 ms
I20230212 20:19:57.865648 23643 workerthread.cpp:202] runLoop Time: 0
I20230212 20:19:57.865960 23643 workerthread.cpp:80] run: Loop running
qt.scenegraph.general: Using sg animation driver
qt.scenegraph.general: Animation Driver: using vsync: 16.67 ms
qt.rhi.general: Created OpenGL context QSurfaceFormat(version 4.1, options QFlags<QSurfaceFormat::FormatOption>(DeprecatedFunctions), depthBufferSize 24, redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 0, stencilBufferSize 8, samples -1, swapBehavior QSurfaceFormat::DoubleBuffer, swapInterval 1, colorSpace QColorSpace(), profile  QSurfaceFormat::CompatibilityProfile)
qt.rhi.general: OpenGL VENDOR: VMware, Inc. RENDERER: SVGA3D; build: RELEASE;  LLVM; VERSION: 4.1 (Compatibility Profile) Mesa 21.2.6
qt.scenegraph.general: MSAA sample count for the swapchain is 1. Alpha channel requested = no.
qt.scenegraph.general: rhi texture atlas dimensions: 2048x2048
Segmentation fault (core dumped)

I'm expecting my Qt Project to display correctly the QtQuick 3D Object (e.g. View3D QML Type) inside a docker container.

[sierdzio]

QtQuick 3D does not support software backend: https://doc.qt.io/qt-6/qtquick3d-requirements.html

[alic]

@sierdzio That's why I'm using OpenGL backend but It gives me a segmentation fault issue. Any idea of what can cause the problem?

[sierdzio]

@alic Docker containers are headless, they don't have displays so also have no need for OpenGL drivers.
You'll probably need to install MESA OpenGL drivers, then launch your app with -platform=offscreen.