On 07 Oct 2014, at 15:37, Andreas Schuller <andreas.schul...@student.tugraz.at> wrote:
> > On 10/07/2014 12:46 PM, Gunnar Sletta wrote: > [...] >>> Is it possible to utilize the z-coordinate of the vertices for this >>> purpose (within a QuickItem)? Or is there a better solution? >> >> You have two options. Either you rely on scene graph's internal batching >> algorithm, (which will probably be sufficient) or you hook your GL up to >> beforeRendering and do custom GL behind the UI. >> >> If you choose to rely on the internal batching, the only thing you need to >> take care of is that your lines's materials are equal >> (QSGMaterial::compare() for all instances will return 0), that your labels >> compare return 0. The markers need to be changed from point sprites to >> triangles to allow batching though. We only try to batch GL_TRIANGLE and >> GL_TRIANGLE_STRIP. > > thank you for your advice! > > What I haven't mentioned is, that the position of each object changes > continuously (e.g. every second) and the number of objects varies from > frame to frame. Additionally, the scene may be rendered in up to 5 windows. > > The results of the "Flying Icons" benchmark are impressive. But IHMO, > creating and maintaining a large tree of small geometry nodes is a bit > wasteful in my case. Maybe, it's better to do custom GL by using > QQuickFramebufferObject instead. Yeah, going through an FBO is another way to do raw GL. It comes with a bit of overhead compared to using the beforeRendering() signal, but has the benefit that it integrates with the rest of the rendering, clipping and opacity and such. On a desktop it will in all likelyhood be fine. For an embedded system, you should verify that the performance is acceptable before choosing it. cheers, Gunnar > > Cheers, > Andreas > > _______________________________________________ > 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
