# Roll

> Talos 0.6 · Since 0.6

## Signature

```ts
export interface Roll {
  /** Unit axis of the spin, world frame: `normal × direction of travel`. `[0, 0, 0]` when it did not move. */
  axis: Vec3
  /** Radians turned about `axis`: distance along the ground over the radius. Never negative. */
  angle: number
  /** The world-frame rotation that turns the body by `angle` about `axis`; pre-multiply it onto the rotation. */
  delta: Quat
  /** `axis × angle / dt`, rad/s, when `dt` was given; what a physics body rolling the same way reports. */
  angularVelocity: Vec3
}
```

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

## Members

| Member | Signature | Description |
|---|---|---|
| `axis` | `axis: Vec3` | Unit axis of the spin, world frame: `normal × direction of travel`. `[0, 0, 0]` when it did not move. |
| `angle` | `angle: number` | Radians turned about `axis`: distance along the ground over the radius. Never negative. |
| `delta` | `delta: Quat` | The world-frame rotation that turns the body by `angle` about `axis`; pre-multiply it onto the rotation. |
| `angularVelocity` | `angularVelocity: Vec3` | `axis × angle / dt`, rad/s, when `dt` was given; what a physics body rolling the same way reports. |