Hi Andrea
Thanks for confirming OGLQt works for you with 11.3. Great!
As for Qt3D, please consider this “under development”. I think we have broken it for both Qt5 and Qt6 at the moment.
Re rendering of coincident surfaces, I’m not aware of any changes. In any case, the result is not well defined, I believe, if, for example, the surfaces have different colours. I will look out for this behaviour change.
And…great…really appreciate your offer of testing. This is all under intense scrutiny at the moment and I may well send you a patch for testing before the next release.
John