# SwayState

> Talos next · Since 0.7

What the `sway` behavior keeps in `ctx.state` (it survives a hot reload, so the rest pose is never re-read from a swayed body).

## Signature

```ts
export interface SwayState {
  /** The child's local position at init: its rest. */
  restPosition?: Vec3
  /** The child's local rotation at init: its rest. */
  restRotation?: Quat
  /** The parent's world position on the last tick. */
  last?: Vec3
  /** The parent's world velocity over the last tick, m/s; absent after a teleport until it is measured again. */
  velocity?: Vec3
  /** Where each spring is. */
  pose?: SwayPose
  /** Set once there is no parent to measure; logged once. */
  orphan?: boolean
}
```

Import: `import type { SwayState } from "@argus/gameplay"`

## Members

| Member | Signature | Description |
|---|---|---|
| `restPosition` | `restPosition?: Vec3` | The child's local position at init: its rest. |
| `restRotation` | `restRotation?: Quat` | The child's local rotation at init: its rest. |
| `last` | `last?: Vec3` | The parent's world position on the last tick. |
| `velocity` | `velocity?: Vec3` | The parent's world velocity over the last tick, m/s; absent after a teleport until it is measured again. |
| `pose` | `pose?: SwayPose` | Where each spring is. |
| `orphan` | `orphan?: boolean` | Set once there is no parent to measure; logged once. |