Spacial audio blend for 2D (ignoring z value)

[PraxTube]

The spacial audio blending is currently using all three values of the transform, which makes sense in 3D but not so much in 2D. It's not a problem if for small z values, but once you start to have values above 10.0 it starts to screw with the distance blending. Was just wondering if there is any intention to address this.

I also noticed that you could potentially implement the following optimization change in here. Not 100% sure if that is producing the exact same result, but it at least sounds similar and it reduces the need to compute a square root calculation for every spacial sound every frame, so that is a decent optimization for bigger games.

let volume = (1. - sound_path.length_squared() / self.max_distance.powi(2))
    .clamp(0., 1.)
    .powi(2);

[NiklasEi]

Both sounds reasonable.

The API of bevy_kira_audio is likely to change drastically over the next few months (see #114). In that, spacial audio might also change and become more configurable.

For now, you could increase max-distance for your special audio taking the probably constant z values into account.

[PraxTube]

Oh awesome. Yeah I just implemented a simple 2D spacial audio on my own. If this crate gets upstreamed into Bevy then there are most likely going to be a lot of changes, in which case this might get reworked too. Will close this and see where we are after a few updates. For anyone in the meantime, this my 2D spacial audio implementation: https://github.com/PraxTube/magus-parvus/blob/master/src/audio/spacial.rs