[Interest] [Qt3D] Logic aspect hangs on exit

[Nye]

Hello Harald,
In fact this is what I'm attempting, but realized that there is a more
"subtle" way to do it. I think that switching the root entity and/or the
frame graph would be more appropriate, than to actually create two separate
GL widgets/windows.

Sean,
No I don't really have any specific use cases. I think how it's now is
fine. I believe my code hangs because of the order of destruction of my
widgets, coupled with me creating the aspect engine on the stack. The
actual dead-lock I get in qaspectmanager.cpp @ 246 : m_waitForEndOfExecLoop.
acquire(1);
My guess is for some reason, because of the structure of my objects, the
event loop is not exiting. Still I wasn't able to reproduce it in a clean
separate projects, so I'll continue debugging and if necessary will file a
bug report.

Kind regards.

On Thu, Dec 17, 2015 at 12:08 PM, Harald Vistnes <harald.vistnes at gmail.com>
wrote:

> 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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