Hi Robert, Some explanation on what I want to do in my application.
First I need to shoot video from rendering at a specified frame rate (25FPS for example). So to do that I have a callback writting images on disk every frame, and I have to slow down my rendering rate, and to increment my time from 1/25 of sec. After that I call advance with this new time (+1/25s). But the main problem occurs when I want to play a path at this low rate, the path manipulator is using real time reference to compute position and orientation so when I shoot my video at 25FPS the path is accelerated. I hope you understand what I need to do (my english vocabulary is limited when it comes to technical explanation, sorry for that). Unfortunately the only solution I had to solve my problem is to change reference time with function "setReferenceTime" and give it my own time computed on desired frame rate. 2009/6/17 Robert Osfield <[email protected]> > Hi Alaxandre, > > You should leave the ReferenceTime alone, it's only SimulationTime > that you should alter and calling frame or advance with this time is > suffiicient - there is no need for the extra calls setting the time. > The ReferenceTime is meant to be real-time value of the frames - > something you'd use for doing stats collection etc., while > SimulationTime is meant to be the time used when compute animations > and physical simulations in the scene. > > The _startTick that the event queue uses should be the same one as the > ReferenceTime uses and makes sure the ReferenceTime and event times > are in sync. It's not typically appropriate to use the SimulationTime > when doing event handling, but if you want to then you'll need to use > the frames FrameStamp to get the current SimulationTime. > > Robert. > > On Wed, Jun 17, 2009 at 10:23 AM, Alexandre > Amalric<[email protected]> wrote: > > Hi osg-users, > > > > I'm experiencing some problem with time management and osgViewer. > > > > I'm under Windows Vista, OSG SVN. > > > > I'm using a composite viewer and my rendering code is : > > > > pCompoViewer->advance(MyTime); > > pCompoViewer->getFrameStamp()->setReferenceTime(MyTime); > > pCompoViewer->getFrameStamp()->setSimulationTime(MyTime); > > pCompoViewer->eventTraversal(); > > pCompoViewer->updateTraversal(); > > pCompoViewer->renderingTraversals(); > > > > instead of : > > > > pCompoViewer->frame() > > > > because I wand to trigger my rendering with a computed time 'MyTime" > based > > on a FPS I need. > > > > But my problem is that when I use my manipulator and ea.getTime() I do > not > > have the same time as "MyTime" when event received is for example > > osgGA::GUIEventAdapter::PUSH. > > ea.getTime() is equal to MyTime only when receiving > > osgGA::GUIEventAdapter::FRAME. > > > > I tracked down this behaviour, in function > > GraphicsWindowWin32::handleNativeWindowingEvent because event time is : > > > > double eventTime = getEventQueue()->getTime(); > > > > and getTime is returning : > > > > osg::Timer::instance()->delta_s(_startTick, > osg::Timer::instance()->tick()); > > > > That's why It doesnt match my rendering time... > > > > Is there any way I can resolve this problem ? (Except making my own > > eventqueue class) > > > > > > -- > > Alexandre AMALRIC Ingénieur R&D > > =================================== > > PIXXIM S.A. 73E, rue Perrin-Solliers 13006 Marseille > > http://www.pixxim.fr > > > > _______________________________________________ > > 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 > -- Alexandre AMALRIC Ingénieur R&D =================================== PIXXIM S.A. 73E, rue Perrin-Solliers 13006 Marseille http://www.pixxim.fr
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