I am not an expert in this area, but our application seems to suffer from this as well. I don't think this has to do with OSG. I believe it to be more driver related. Do you have VSync turned on? If you do, force VSync to be always off and retest.
Ryan H. Kawicki The Boeing Company Training Systems & Services Software Engineer ________________________________ From: Serge Lages [mailto:[EMAIL PROTECTED] Sent: Thursday, September 11, 2008 4:53 AM To: OpenSceneGraph Users Subject: [osg-users] Strange behavior with multiple screens and ImageStream Hi all, We've made an ImageStream using FFmpeg to display movies on textures, but I am currently facing some problem when displaying this movie on two different contexts. Here is my setup : WinXP with one GForce 8600GTS and 2 screens, viewer on DrawThreadPerContext mode (OSG SVN head version). When I only have one screen but two windows (with a different context per window), everything works fine, the movie is displayed on the 2 windows without any problem. When I plug a second screen, and I keep the same setup (2 windows rendered into the first screen), I have a huge frame drop (more than 20 fps) when rendering my movie (note that in this configuration, nothing is displayed on the second screen). Same thing happens if I use the 2 screens (with each window in full screen mode on each screen). I really don't understand why adding a new screens make this difference, moreover it's the only thing in my application that suffer like that from the second screen. Does it ring a bell to someone ? Thanks in advance ! -- Serge Lages http://www.tharsis-software.com
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