Hi Guys, The gap between draw dispatch (the yellow bar) and draw GPU (the orange bar) is by its nature variable. The reason is it so variable is that I have to estimate the begining of the draw GPU as the OpenGL GPU stats extension only provide elapsed time, they don't provide any details on absolutely time, while the CPU code is all in absolute timings. As GPU stats are really useful the best I could do is take the time that the GPU stats were collected (on the next frame), which gives us a time that we know it was complete by, then estimate that GPU work was, I can't recall the exact maths off hand. The bottom line is that it's position is an estimate, but it's length is measure.
As for the frame rate being awful when running with two GPU, this is likely to be a driver/OS issue. W.r.t whether you should use vsynv when you are using projectors/LCD's, yes vysn is still required, they still read their data via a scan line, so if swap buffer happens during the scan then some of the screen will be from the previous frame, and some from the next, or it can even be several frames worth on a single frame if your frame rate is high. What you'll see if a tearing across the screen, especially visible when you are turning the eye point quickly. Robert. _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
