Clarify how `Plane3d` is oriented in space about bevy HOT 6 OPEN

Might be better to use a private pair of orthonormal vectors. Would downgrade normal to a function, so would be a breaking change.

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Might be better to use a private pair of orthonormal vectors. Would downgrade normal to a function, so would be a breaking change.

I like this idea.

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@mweatherley, I have a question though. If Plane3d represents a "rectangular section of an infinite plane", then what does Plane2d represent?

pub struct Plane3d {
    /// The normal of the plane. The plane will be placed perpendicular to this direction
    pub normal: Dir3,
    /// Half of the width and height of the plane
    pub half_size: Vec2,
}

pub struct Plane2d {
    /// The normal of the plane. The plane will be placed perpendicular to this direction
    pub normal: Dir2,
}                                                                                                                       

I believe these two things should be pushed back to the drawing board.

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I think plane2d is actually an infinite line iirc. Yeah, the situation is not great.

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Honestly, I'm not sure we even need Plane2d since we already have Line2d. The only real difference is just that they're perpendicular to one another (the plane has a normal and the line has a direction).

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Good point. The only thing Line2d is missing is a right-handed normal() -> Dir2 method.

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