[Interest] [Qt3D] Logic aspect hangs on exit

[Harald Vistnes]

Hi,

I'm also interested in how to handle multiple windows with Qt3D. My use
case is a widgets based CAD like application that will have two independent
3D windows in a QStackedWidget (so only one 3D window will be visible at a
time). They will have different models loaded and the user will switch from
one window to the other. Also, for each window, it must be possible to
render the current view (root QEntity) to a high-res image.So in this case
I guess there will be one QAspectEngine for each of the windows and then
temporary QAspectEngines for offscreen rendering that shares the root
entity with the other QAspectEngines?

Harald


2015-12-17 10:49 GMT+01:00 Sean Harmer <sean.harmer at kdab.com>:

> On Thursday 17 Dec 2015 11:37:49 Nye wrote:
> > Hello,
> > It (most probably) is a problem with my code. I've created two aspect
> > engines (this is in a widget and I have two instances). I suppose having
> > two aspect engines is not allowed? I've done it this way, because the
> > aspect engine handles a single surface/window. Interestingly, it happens
> > only with the logic aspect. On a related note, what would be the proper
> way
> > to use two gl windows with Qt3D?
>
> At present it is indeed to make two QAspectEngines as you are doing. This
> is
> something I'm looking into at the moment as it happens - well more
> generally
> what top level integration points do we need to support for the initial
> version.
>
> If you have specific use cases, I'd be interested to hear what they are.
>
> Cheers,
>
> Sean
>
> >
> > Kind regards.
> >
> > On Thu, Dec 17, 2015 at 10:52 AM, Sean Harmer <sean.harmer at kdab.com>
> wrote:
> > > Hi,
> > >
> > > Can you file a bugreport with a small test case for this please? This
> was
> > > certainly working in the cases I tested. Perhaps there's a regression
> we
> > > need
> > > to fix.
> > >
> > > Thanks,
> > >
> > > Sean
> > >
> > > On Thursday 17 Dec 2015 09:51:51 Nye wrote:
> > > > Hello,
> > > > It seems for some reason that adding a logic aspect to the aspect
> engine
> > > > causes the application to "hang" on exit. My guess is that for some
> > >
> > > reason
> > >
> > > > the shutdown sequence is not executing properly and the threads in
> the
> > >
> > > pool
> > >
> > > > are left in waiting. Is there currently a workaround for that (i.e.
> can
> > > > I
> > > > manually shutdown the aspect engine)? I'm creating the aspect engine
> on
> > >
> > > the
> > >
> > > > stack, maybe this is an issue?
> > > > I'm developing on Debian stretch with 4.2 kernel, if that helps.
> Qt3D is
> > > > compiled from the most recent source available in the git repository
> for
> > > > the 5.6 branch.
> > > >
> > > > Kind regards.
> > >
> > > --
> > > Dr Sean Harmer | sean.harmer at kdab.com | Managing Director UK
> > > KDAB (UK) Ltd, a KDAB Group company
> > > Tel. +44 (0)1625 809908; Sweden (HQ) +46-563-540090
> > > Mobile: +44 (0)7545 140604
> > > KDAB - Qt Experts
>
> --
> Dr Sean Harmer | sean.harmer at kdab.com | Managing Director UK
> KDAB (UK) Ltd, a KDAB Group company
> Tel. +44 (0)1625 809908; Sweden (HQ) +46-563-540090
> Mobile: +44 (0)7545 140604
> KDAB - Qt Experts
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