3D audio stereo incorrect panning

[et1337]

As far as I can tell, Audio3DManager is incorrectly calculating the vectors for determining 3D audio stereo panning.

If someone can confirm this bug, it's an easy fix in the python code. I patched it myself in two lines.

Replace Audio3DManager.py lines 268-269 with the following:

forward = self.root.getRelativeVector(self.listener_target, VBase3(0,1,0))
up = self.root.getRelativeVector(self.listener_target, VBase3(0,0,1))

The original code just had self.root and self.listener_target switched around.

For the record, I'm on Vista x64, but I also had the issue on 32-bit XP. Panda3D 1.6.2.

[rdb (rdb)]

Hi,

Do you happen to have some sample code that shows the problem, so that we can make sure that this fix applies to all cases? I'm not sure if I should check this in blindly as the bug might be dependent on more factors.

Thank you!

[et1337 (et1337)]

Sure do, it's attached in a zip file. Try running "buggy-audio.py" with
headphones on. The sound is coming from the box, and when you rotate the
camera around the box, it sounds like it's coming from different directions,
when really, the box is still right in front of the camera. Then try
"working-audio.py" and see the difference.
"working-audio.py" uses my patched version of Audio3DManager, found in
"PatchedAudio3DManager.py".

Thanks for taking the time to look at this.

On Wed, Oct 14, 2009 at 2:37 AM, Reinier de Blois <email address hidden>wrote:

> Hi,
>
> Do you happen to have some sample code that shows the problem, so that
> we can make sure that this fix applies to all cases? I'm not sure if I
> should check this in blindly as the bug might be dependent on more
> factors.
>
> Thank you!
>
> --
> 3D audio stereo incorrect panning
> https://bugs.launchpad.net/bugs/444208
> You received this bug notification because you are a direct subscriber
> of the bug.
>
> Status in Panda3D: New
>
> Bug description:
> As far as I can tell, Audio3DManager is incorrectly calculating the vectors
> for determining 3D audio stereo panning.
>
> If someone can confirm this bug, it's an easy fix in the python code. I
> patched it myself in two lines.
>
> Replace Audio3DManager.py lines 268-269 with the following:
>
> forward = self.root.getRelativeVector(self.listener_target, VBase3(0,1,0))
> up = self.root.getRelativeVector(self.listener_target, VBase3(0,0,1))
>
> The original code just had self.root and self.listener_target switched
> around.
>
> For the record, I'm on Vista x64, but I also had the issue on 32-bit XP.
> Panda3D 1.6.2.
>

[rdb (rdb)]

Sorry for not getting around to this earlier. I've applied your fix, thank you for reporting the bug and tracking it down.