Struct BodyObservation 

pub struct BodyObservation {
    pub body_index: usize,
    pub position: Vec3Fix,
    pub velocity: Vec3Fix,
    pub rotation: QuatFix,
    pub angular_velocity: Vec3Fix,
    pub sleeping: bool,
    pub in_contact: bool,
}

Typed, read-only observation of a single body’s law-relevant state.

Public入口 for PhysicsWorld::observe_body / PhysicsWorld::observe_bodies — 「Law が読む形の観測型」 observation 以前は blob の parse か field 直読みしかなく、公開 interface が無かった

Fields

body_index: usize

Body index this observation was taken from.

⚠️ フレーム内でのみ安定 — PhysicsWorld::remove_body は swap_remove なので、body の生成・破棄を跨いで同じ index が同じ body を指す保証はない

position: Vec3Fix

Position (center of mass).

velocity: Vec3Fix

Linear velocity.

rotation: QuatFix

Orientation.

angular_velocity: Vec3Fix

Angular velocity.

sleeping: bool

Whether the body is currently asleep (island manager).

in_contact: bool

Whether the body has at least one active contact this frame (Begin or Persist, from crate::event::EventCollector).

⚠️ grounded ではない — 一般 body に地面接触の定義は無いため、 「何らかの body と接触している」という弱い述語に留める

Trait Implementations

impl Clone for BodyObservation

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for BodyObservation

impl Debug for BodyObservation

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for BodyObservation

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for BodyObservation