[Interest] [Qt 3D] Entities with custom meshes disappear when there are many of them in one place

[Oleg Evseev]

If suddenly somebody are interested in this case, such behavior was related
to PhongAlphaMaterial (even with alpha=1.0) in scene within Scene3D qml
Item inside qml Loader.
When using PhongMaterial instead everything works fine.

I filed a JIRA about related issues:
https://bugreports.qt.io/browse/QTBUG-53935

Regards, Oleg


2016-05-01 23:57 GMT+03:00 Oleg Evseev <ev.mipt at gmail.com>:

> Hi,
>
> Not going into details just the main point:
>
> In my scene I have huge ground plane and on top of it I draw car path.
> I break path mesh into peaces, create new entity with QGeometryRenderer,
> meshGeometry and so on in it and append it to my current parent Entity.
> When vertex array get filled, I create new one and so on.
> It works, but when car starts driving by round almost at the same loop
> place, all Entities of that loop suddenly disappear (at a moment when car
> trying to pass almost same way in fifth time) and no new Entities (even
> when car drives out from loop) are not shown anymore (despite they are
> added to scene).
>
> Here https://www.youtube.com/watch?v=InxhSB_YuhU I recorded video
> illustrated this problem.
> Windows 7 x64, Qt 5.6
>
> Maybe those problems related to OpenGl realization in Windows/video card
> drivers?
>
> Thank for help in advance.
>
> Regard, Oleg
>
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