Hi Marko, You could use a Camera::FinalDrawCallback to sync, or simply run the viewer in CullThreadPerContext or SingleThreaded threading model. It's only the default DrawThreadPerContext (default on multi-core systems) and CullThreadPerCameraDrawThreadPerContext threading models that allow the next frame to start while static objects are still being drawn.
Robert. On 19 June 2013 13:34, Marko Srebre <[email protected]> wrote: > Hello, > > I am having a compute pipeline (physics simulation) that ends with a camera > that renders to an image (for further processing on cpu). I'd like the > Viewer::frame() to exit only after the image has been rendered to, so that > update traversal happens after the data has been downloaded to image. > > I am familiar with the workings of > > > Code: > setDataVariance(osg::Object::DYNAMIC), > > > > but this unfortunately applies to drawables, not the output image. If I set > data variance to dynamic, the frame() will wait to process the drawables for > the camera node, but exit right after, not waiting for the render to image to > finish. The only way I could figure out, to make it wait, is to set up a > dummy camera (with dynamic variance) with a render order right after my > image-camera. That works, but I was hoping there is nicer solution to this > problem that I am missing. > > I was also considering camera PostDraw callback, but it doesn't really solve > the problem, since the downloaded data won't be available in the next frame > update travesal. > > If anyone can share some experience on this matter, I'd appreciate it. Thanks. > > Cheers, > Marko > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=54699#54699 > > > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
