> On 06 Feb 2015, at 16:22, Thomas Sevaldrud <tho...@silentwings.no> wrote: > > Hi, > > I have two questions regarding QSGNodes. In my application I have used a > Repeater with delegate Items to place labels defined in QML on objects in a > 3D scene. To achieve this, I made a class derived from QSGSimpleRectNode and > QObject with a slot that is called on the containing QWindow's > beforeRendering(). This slot method calculates the 2D screen position of the > 3D object in question and updates the parent QSGTransformNode accordingly. > > This works quite nice, except that I get my labels in a more or less random > depth order. I suspect that they are rendered in the order they are created > or inserted into the scene graph.
yes, this is how it works. > Is there a way to get z-order sorting of QSGGNodes? If you made all your labels children of one QSGNode, you could sort them in the order you preferred yourself. > > For each label there is also a QuickItem which I could set the z value on, > but this item is generally not updated for each rendering frame, only when > the label content is changed. The label scenegraph node is updated for each > rendering frame, since the 3D camera is continously moving. > > Also, many of these labels will be invisible much of the time, because the > end up outside of the 3D scene. Is there a way to say that an SGNode is > invisible, and thus avoiding that it is rendered, or do I need to update the > corresponding QuickItem again? You make a node invisible by removing it from the scene graph. > > If the only solution to these two issues is to update the corresponding > QuickItem, what is the recommended way of doing this? I need to do this when > the GUI and rendering threads are synchronized QQuickItem::updatePaintNode() or QQuickWindow::before/afterSynchronization is what you are after. > > TIA for any ideas :-) > _______________________________________________ > 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
