inverted sign wastes hours of girls life about bevy_xpbd

[Jondolf]

Unfortunately, this isn't really something I can fix. The sign is negative there because of Bevy's right-handed Y-up coordinate system. In Bevy, +Z is "pointing towards the screen", while "forward" is -Z, which you can see from Transform::forward:

pub fn forward(&self) -> Direction3d {
    -self.local_z()
}

There's a lot of reasons why Bevy uses this coordinate system, and it's also consistent with e.g. Godot and a lot of other tools. Cart (the lead dev of Bevy) has some reasons listed here: bevyengine/bevy#10488

Here's also Freya's chart on coordinate systems: (copied from the discussion)

(Unreal sitting alone in the corner lol)

[Cassumbra]

yeah, i cant really think of any sort of thing that would fix it, maybe the best thing to do would be to simply add a comment next to the code to point out the inverted sign?

[MiniaczQ]

Inverse left and right buttons...
The inversion has to happen, but it should happen in player local coordinate system, not world coordinate system