Hi, Qt3D performance on Android was my concern a year ago too: https://bugreports.qt.io/browse/QTBUG-72808 (see also https://bugreports.qt.io/browse/QTBUG-73057) especially when Scene3D with multi sampling is used. Using OnDemand policy improve performance (but almost in stale scenes), take a look.
I thought that new Underlay compositingMode introduced in 5.14 ( https://doc.qt.io/qt-5/qml-qtquick-scene3d-scene3d.html#compositingMode-prop) will increase performance twice or even more, but unfortunately I didn't see any increase at least in our case and hardware. But you can take a look to it. But just in case, note about bug Scene3D.Underlay + OnDemand (QTBUG-82861) About examples. First of all, take look at Qt 3D examples especially manual tests as Mike Krus rightly suggested. I can't be supportive but if you want, you can take a look to several simple apps I made for test case in bug reports, may be there will be useful somehow for you. I used Qt3D in C++ inside World3d as the root object of QML Scene3D (several test examples can be similar in fact). QTBUG-80092, QTBUG-60612, QTBUG-60429, QTBUG-60183, QTBUG-50720 p.s. I will also take the opportunity to express here my pains about Qt3D a little :) Our project is based on Qt3D and it is really nice and handy, but we stack with Qt 5.9.5. With some workarounds it get turn out as most stable version for us, every time we try to move to newer version 5.10, 5.11, 5.12, 5.14 we are always encountered with bugs and crashes. And the most upset that several of them were repeated in next versions after fixes :( Unfortunately now I don't have enough time to test and post bugrepost, hope latter I can help to improve Qt 3d a little. Despite any issues, thank all Qt developers and community for their work! --- With regards, Oleg вт, 14 апр. 2020 г. в 18:50, Charles Martin <mart...@ucar.edu>: > I’ve been migrating a C++ Coin/Quarter project to Qt3D. I’m doing this on > a newer iMac/Catalina. The graphics performance seems unacceptable. A > simple display of 3600 line segments takes about 5 seconds to render and > 30k segments takes >30 seconds. > > When the rendering is started, Qt puts out this warning message: > qt.qpa.openglcontext: Could not create NSOpenGLContext with shared > context, falling back to unshared context. > > I’m new to Qt3D, and there is a good chance that I’m doing something wrong. > > My questions: > > - Shouldn't I see better performance, and what can I try to improve > that? Does the warning message identify the problem? > > - Where can I find more examples, tutorials and introductory information? > There are only two C++ examples on the Qt website, and both of these are > very simple. The Qt docs are very limited and incomplete. > > - Is there a community of C++ Qt3D developers? Most online material was > produced by KADB, is 4 years or older, and focuses on QML. Where are the > C++ users? > > I’m trying to get some traction with this product, and any guidance is > really appreciated. > > Thanks, > Charlie > > > > _______________________________________________ > Interest mailing list > Interest@qt-project.org > https://lists.qt-project.org/listinfo/interest >
_______________________________________________ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest
