On Friday 23 February 2007 18:08, Georg Vollnhals wrote: > Hasenack schrieb: > > It's an LCD here. I'm not sure "60hz" counts for LCDs. There is no > > flicker at all, image is super sharp. Also at 1280x1024. > > Hi, > might be your LCD display accepts a higher vertical refresh rate from > your videocard? > The idea is to further increase your FlightGear framerate, which depends > on the vertical refresh rate of your graphiccard/LCD display combination > in case you set VSync on (as you and I have to do due to the stutter > problems). > Increasing the vertical refresh rate from 60 to ie 85 could make your > FlightGear display smoother. It is just a pity to "brake" FlightGear an > such a modern hitec system you own too much. It might be FlightGear is > loosing too much time waiting for the next VSync display cycle, just a > thought :-). > > Regards > Georg EDDW
Almost all LCDs have a native refresh rate of 60 FPS which works out to about 16.66 milliseconds per frame. There is a frame rate at which the human eye can detect the motion not being smooth but I suspect that it way below 60 FPS. In fact my gut feeling is that this is closer to 10 FPS. Think about movies which are 24 FPS do these not seem smooth to you when you go to the theater? In addition I believe that the current HDTV standard calls for 30 FPS. I think if it required more than this frame rate to get a smooth presentation that the standard would have a higher frame rate. One other data point the FAA requires that certified flight simulators must have a frame rate of at least 10 FPS. My own experience with FG is that anything over 20 FPS feels just fine as long as the CPU is doing everything it needs to to keep each frame synced to what should be happening. So Andreas should be golden at 60 FPS with his LCD display. The reason to use higher refresh rates on CRTs is that this reduces the flicker that occurs because the phosphors start to fade during the longer interval between passes of the electron gun at slower refresh rates. LCDs don't have this issue because the pixels have a more or less constant output at any setting. EI. no fading during the refresh cycle like a CRT and therefore no flicker even at very slow refresh rates. Hal ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Flightgear-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/flightgear-users
