[osg-users] animation synchronisation

[Robert Osfield]

On Sun, Mar 2, 2008 at 8:51 PM,  <dkfm4 at gmx.net> wrote:
> Hello!
>
>  How can/should I synchronize the application flow-control to the end of
>  an animation (realized as osg::AnimationPath) ?
>
>  Assume: we have a projectile that should be animated.
>  1. we calculate the trajectory and setup the animation-path with some trajectory data.
>  2. then the animation-path will be applied to the projectile-node (the
>  exact way to do this, is still vague to me; the only information source
>  I found untill now, is the osganimation example, which handles only a
>  single animation type, with endless animation)
>
>  3. == now: how can I sync the rest of the application with the end of the
>  projectile-animation ? ==
>  e.g. expand scene graph with new data, start other animation(s), etc...

There isn't a built in feature to do this - the OSG can't provide all
the features that all users might require, so rather than chase this
impossible task the extensibility is what saves the day.   In this
light, try subclassing from the AnimationPathCallback and add your own
monitor and catch code.   Or perhaps just decorated the
AnimationPathCallback with your own callback that nests it.

>  The way with polling the timer seems somehow crude to me... There should
>  be a better way ?! (better documentation !)

What better documentation for solving tasks that haven't been foreseen
as features that users may wish?

What we really need is a documentation improbability drive, one that
is able to read minds and foresee the future and the document it
fully, with full diagrams, and provides example code that exactly
matches your specific needs, in fact just provides your whole program
written for you, as if you have written it because the documentation
improbability drive has copied it from the future - just by copying
what you wrote in the future means that you have a circular reference,
and an infinite loop that if you are not careful will spiral in on
itself creating a time space vortex that sucks in all matter and the
universe implodes. => POP! <=  ;-)

Since I don't know of a fully functioning documentation improbability
drive yet we'll just have to stick with question and answers on the
osg-users mailing list, it's probably the cloest we can get to it, and
so far it doesn't seem to have swallowed up any universes, umm....
perhaps I'm unwittingy part of documentation improbability drive and
if I press send the loop will be completed... ooo dangerous.  Do I
feel lucky this Monday mornign? Ohh well what will be will be....

Robert ;-)
Robert.