Yes, that would work altough I would have preferred a way which doesn't require the C++ entity hierarchy to be exposed to the QML code, just to be assigned back to a property on the Scene3D object. In any case I can use it like this for now until I find a better solution. Since parts of the Qt3D API is still WIP I'm hoping that such a better solution will be provided.
On Thu, 2018-09-06 at 18:49 +0000, Gil H wrote: > If all you need is to have Scene3D as part of your QML but the entire > entity hierarchy come from C++, then you should be able to do that > just by creating the C++ entities and passing the root to the entity > property of the Scene3D item. You can set properties on QML items > from C++ and you can read values from C++ inside your QML. Many 3D > entities are easier to describe in QML (e.g. the framegraph itself > and custom materials), and I'm not sure of the implications of mixing > entities created in C++ and QML in terms of object ownership, > threading, lifecycle, etc. I've slogged through so many crashes and > freezes when trying to adopt Qt3D in an “unconventional” use case > that I can't remember each issue I've faced along the way. But > hopefully things will go more smoothly for you. Highly recommend > basing any work off the very latest Qt3D code if you can (5.11.2 > branch) > > Cheers, > > Gil > > On 9/6/18, 2:36 PM, “interest-bounces+qt=tastytech...@qt-project.org > on behalf of dns.bot...@gmail.com” < > interest-bounces+qt=tastytech...@qt-project.org on behalf of > dns.bot...@gmail.com> wrote: > > Hi, > > According to the documentation [1] there are two ways to use Qt3D: > * From C++. > * From QML. > > There is also a bridge class (Qt3DScene2D) which allows rendering a > QtQuick2 content into a Qt3D scene and another one (QtQuick.Scene3D) > which allows for the opposite, rendering a Qt3D scene into a QtQuick > one, however this latter only allows working with the Qt3D QML types. > What I would like to do is to generate the scene from C++ and use it > in > a QtQuick2 GUI. Kinda like how inheriting from QQuickItem allows one > to > do the drawing in C++ and seamlessly integrate the resulting item > into > a QML scene. > Looking at the sources [2] this should be easily achievable, all we'd > need is a slightly modified `Scene3DItem` class which allows the > inheriting class to set up the entity tree and other aspects of the > scene and not allowing these to be meddled with from QML (basically > stripping all existing properties and invokables and requiring them > to > be set by C++ code). > > Are there any plans to allow for something like this? Or is there > already a way to do this that I'm not aware of? > > Regards, > Botond > > [1] https://doc.qt.io/qt-5/qt3d-index.html > [2] > https://code.qt.io/cgit/qt/qt3d.git/tree/src/quick3d/imports/scene3d > > _______________________________________________ > Interest mailing list > Interest@qt-project.org > http://lists.qt-project.org/mailman/listinfo/interest > > > _______________________________________________ > Interest mailing list > Interest@qt-project.org > http://lists.qt-project.org/mailman/listinfo/interest > > _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
