Hi David, are your cards running in "quadro mosaic" mode or are they configured as independent cards? Our win7 machine is driving 6 channels from 2 cards for a cylindrical theatre, and have no problem running in full sync (stereo as well as monoscopic view). Laurens.
On Mon, Oct 1, 2018 at 7:25 PM David Heitbrink <david-heitbr...@uiowa.edu> wrote: > I currently have an odd problem I am stuck on. I have a system with 2 > Quadro P5000 cards- driving 3 displays that are warped and blended on a 120 > degree dome. Running Windows 10. The application is ground vehicle > simulation - I have pretty high rates of optical flow. Each display is > running its own process, they receive a UDP broadcast with position update > information. What I am seeing is 1 of the displays is off by 1 frame 95% of > the time. When this happens....my blending fails and I get a large seam in > my scene. I added logging as to the eye point position as well as high > frequency counter time. > > From what I can tell from the logs, the return from the VSync's > (viewer->frame() ) are all within 200 microseconds, and the eye point > position and data frame number (i.e. the frame number for my incoming data) > is the same across all of the channels. > > So I strongly suspect this has something to do with the graphics > card/driver's own internal frame buffering....and there is not a lot I can > do about it. > > This leaves me with a couple of real issues..... > 1) Programmatically cannot tell if a channel is a frame behind or not. > Basically I added buffering for the other 2 channels for position > information......and my seam goes away 95% of the time > 2) Since things are not 100% the same.......I randomly get a seam 5% of > the time (assuming I am buffering). > > At this point I don't know what to do.....I have talked to NVidia about > this, they mentioned making sure DPI scaling in windows is set to 100% > and/or setting up the app to be DPI aware. I have done this.....but I get > the same result. > > > Any advice and/or speculative guesses on this would be great. > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=75001#75001 > > > > > > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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