0
\$\begingroup\$

I'm working on an OpenSceneGraph animation, and I want events in the animation to be synchronized to a time reference provided by my audio player (BASS or FMod). Yes, this is a demo :) . Which time do I set, and where? Sync is more important than frame rate or continuity - if the audio rewinds, I want the visuals to rewind, too. (To support GNU Rocket.)

I have looked at the forum posts and Google results, but haven't seen a clear answer for this use case.

  • FrameStamps have a frame number, a calendar time, a simulation time, and a reference time. I think the simulation time is what I should change - is that so?

  • Is specifying a new simulation time as a parameter to frame() or advance() the right way to specify the time? Will that work even if time moves backwards?

\$\endgroup\$
1
\$\begingroup\$

The answer can be found in the osgViewer::ViewerBase class:

/** Render a complete new frame.
  * Calls advance(), eventTraversal(), updateTraversal(), renderingTraversals(). */
virtual void frame(double simulationTime=USE_REFERENCE_TIME);

virtual void advance(double simulationTime=USE_REFERENCE_TIME) = 0;

So just pass the simulation time you want to viewer.frame(time).

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.