Struct TransformInterpolation 

pub struct TransformInterpolation { /* private fields */ }

Per-entity snapshots of the world-space transform before the latest simulation step, consumed by the render path for motion interpolation.

Engine-internal: populated by the data layer’s capture pass for simulated bodies and read by the render projection. Not an ECS component (see the module docs) — it is neither inspectable nor serialized.

Implementations

impl TransformInterpolation

pub fn new() -> Self

Creates an empty store.

pub fn previous(&self, entity: EntityId) -> Option<AffineTransform>

The pre-step world-space transform recorded for entity, if the entity is currently simulated. None means “render at the current transform” (static entity, or first frame before any snapshot).

pub fn record(&mut self, entity: EntityId, transform: AffineTransform)

Records entity’s current world-space transform as the pose to interpolate from on the next render.

pub fn retain_live(&mut self, live: &HashSet<EntityId>)

Drops snapshots for entities absent from live — despawned bodies, or entities the simulation no longer moves. Bounds memory and prevents a recycled EntityId from reading a stale generation’s pose.

pub fn len(&self) -> usize

Number of entities with a recorded previous pose.

pub fn is_empty(&self) -> bool

Whether no previous pose is recorded.

Trait Implementations

impl Debug for TransformInterpolation

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

Formats the value using the given formatter.

impl Default for TransformInterpolation

fn default() -> TransformInterpolation

Returns the “default value” for a type.