On Sun, Sep 20, 2009 at 6:23 AM, Erik Hofman <e...@ehofman.com> wrote:
>
>
> > One other I've remember from looking at the code - for some reason we
> > always positioned the listener at (0,0,0), and do a lot of work to
> > transform world positions into a listener-relative basis. As I
> > understand it, OpenAL can do that itself, i.e we could use a 'world'
> > transform for most of the source positions (which would be simpler),
> > and pass the FGViewer orientation as the OpenAL listener orientation.
> > I *think* at that point the OpenAL and OSG local cartesian systems
> > would be in-sync, which might help people generally understanding the
> > code!
>
> True, and I expect it's also the reason why doppler didn't work
> correctly (besides that the listener velocity wasn't updated while
> OpenAL needs both the listener velocity and the source velocity for
> proper calculation of the doppler effect).
>
There were also some issues with OpenAL 1.0, which were solved by 1.1, I
recall sending a patch for this issue a while ago, I never check if it got
accepted, etc, since life has been hectic :-) The issue of not setting
listener velocity would of course also need addressing (doppler is all about
relative velocity!).
> What I'm planning on doing is let the SoundManager handle the OpenAL
> context suff /and/ the listener properties and let the individual
> SampleGroups handle positioning and handling the properties of all
> associated samples.
>
I'm also interested in OpenAL and did a little work on this area, I'm very
busy these days but I would like to continue contributing :)
Matias D'Ambrosio
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