[Interest] [Qt3D] Ununderstable message when closing a scene

[Xavier Bigand]

I also open a bug report for the memory management :
https://bugreports.qt.io/browse/QTBUG-54194

2016-06-17 14:52 GMT+02:00 Xavier Bigand <flamaros.xavier at gmail.com>:

> https://bugreports.qt.io/browse/QTBUG-54184
>
> For the leaks I need to check, but firstly it seems that textures stay in
> RAM even when already in VRAM.
>
> 2016-06-17 12:33 GMT+02:00 Sean Harmer <sean.harmer at kdab.com>:
>
>> Hi,
>>
>> On Friday 17 June 2016 12:11:56 Xavier Bigand wrote:
>> > I finally found a work around to fix my crash when loading models
>> > after few unload.
>> >
>> > I simply release myself all children of the delete entity with the
>> > following recursive method :
>> >
>> >
>> >     void    releaseModel(Qt3DCore::QNode& model)
>> >
>> >     {
>> >
>> >         QEntity*    entity = dynamic_cast<QEntity*>(&model);
>> >
>> >
>> >         if (entity)
>> >
>> >         {
>> >
>> >             QComponentVector    components = entity->components();
>> >
>> >
>> >             foreach (QComponent* component, components)
>> >
>> >             {
>> >
>> >                 entity->removeComponent(component);
>> >
>> >                 delete component;
>> >
>> >             }
>> >
>> >         }
>> >
>> >
>> >         QNodeVector nodes = model.childNodes();
>> >
>> >
>> >         foreach (QNode* node, nodes)
>> >
>> >         {
>> >
>> >             releaseModel(*node);
>> >
>> >             delete node;
>> >
>> >         }
>> >
>> >     }
>> >
>> >
>> >
>> > I don't know why I haven't the same behavior when letting Qt doing it.
>> >
>> >
>> >
>> > Need I fill a bug?
>>
>> Yes, please file a JIRA. Ideally with a test case. Also for any leaks you
>> suspect.
>>
>> Thanks,
>>
>> Sean
>>
>> >
>> >
>> >
>> > It seems that Qt3D have a lot of memory leaks, after changing a few
>> > projects our application use more than 1Go when with our actual 3D
>> engine
>> > it's always lower than 200Mo.
>> >
>> > 2016-06-16 23:03 GMT+02:00 Xavier Bigand <flamaros.xavier at gmail.com>:
>> > > Thank for the report.
>> > >
>> > > I was not sure if it wasn't me doing something wrong.
>> > >
>> > > But it might be the case, because the assert seems to come from a bad
>> > > ressources management.
>> > > When I switch projects I simply delete entities that attached to the
>> root
>> > > one, but doing this leads to the assert at a certain time and memory
>> leaks
>> > > apparently.
>> > >
>> > > My scenes are composed of objects that I load from a custom file
>> format,
>> > > it's for an architecture software.
>> > >
>> > > I can load 2 projects in a row, and on the third I get the assert.
>> > >
>> > > It seems that I can debug when using Visual instead of QtCreator. And
>> it
>> > > surprise me because the release of ressources seems to be done later
>> than
>> > > when I call the delete of entities.
>> > >
>> > > 2016-06-16 21:14 GMT+02:00 Harald Vistnes <harald.vistnes at gmail.com>:
>> > >> I get the same QMetaProperty::read warning. I just filed a Jira for
>> it.
>> > >> https://bugreports.qt.io/browse/QTBUG-54159?filter=17174
>> > >>
>> > >> Annoying and it came recently, but not critical as you can continue
>> > >> running the debugger.
>> > >>
>> > >> Harald
>> > >>
>> > >> 2016-06-16 17:53 GMT+02:00 Xavier Bigand <flamaros.xavier at gmail.com
>> >:
>> > >>> Sometimes when it doesn't crash on the first scene switch I can get
>> this
>> > >>> assert :
>> > >>> ASSERT: "m_entries[index].m_counter == handle.counter()" in file
>> > >>> c:/Users/qt/work/qt/qt3d/src/core/resources/qhandlemanager_p.h,
>> line 170
>> > >>>
>> > >>> Sadly it seems that I am not able to debug it with source code.
>> > >>>
>> > >>> 2016-06-16 17:35 GMT+02:00 Xavier Bigand <flamaros.xavier at gmail.com
>> >:
>> > >>>> I am getting the following message when I unload a scene. I am
>> simply
>> > >>>> deleting the entities I don't have to display anymore.
>> > >>>>
>> > >>>> QMetaProperty::read: Unable to handle unregistered datatype
>> > >>>> 'Qt3DRender::QBuffer*' for property
>> 'Qt3DRender::QAttribute::buffer'
>> > >>>>
>> > >>>> What is the proper way to unload meshes in c++? Need I also delete
>> all
>> > >>>> attached components (QGeometryRenderer, QBuffer, ...)?
>> > >>>>
>> > >>>> --
>> > >>>> Xavier
>> > >>>
>> > >>> --
>> > >>> Xavier
>> > >>>
>> > >>> _______________________________________________
>> > >>> Interest mailing list
>> > >>> Interest at qt-project.org
>> > >>> http://lists.qt-project.org/mailman/listinfo/interest
>> > >
>> > > --
>> > > Xavier
>>
>> --
>> Dr Sean Harmer | sean.harmer at kdab.com | Managing Director UK
>> Klarälvdalens Datakonsult AB, a KDAB Group company
>> Tel. UK +44 (0)1625 809908, Sweden (HQ) +46-563-540090
>> KDAB - Qt Experts - Platform-independent software solutions
>>
>
>
>
> --
> Xavier
>



-- 
Xavier
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