Hi Riccardo, I can't speak to the specific slow down you're encountering with context switches. I tried to solve a similar problem (osg in qt quick) but I don't use context switching -- I could never figure out how to get that to work correctly so I'll have to go through what you did carelfully :)
Have you checked out the following docs: http://doc-snapshot.qt-project.org/qt5-dev/qtquick/qtquick-visualcanvas-scenegraph.html http://doc-snapshot.qt-project.org/qt5-dev/qtquick/quick-scenegraph-textureinsgnode.html http://doc-snapshot.qt-project.org/qt5-dev/qtquick/quick-scenegraph-textureinthread.html And here's my attempt [copy of the method used in the docs but with an osg embedded viewer and *no* context switching -- I just reset some specific state] https://github.com/preet/scratch/tree/master/qt5/qquickfboviewport
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