# AuthorPlacement

> Talos next · Since 0.6

Where an entity goes, relative to its parent.

Every field defaults (origin, no turn, unit scale).

## Signature

```ts
export interface AuthorPlacement {
  /** A handle from this script, or the id of any entity of the scene. */
  parent?: AuthorHandle | string;
  /** Offset from the parent, in metres. */
  position?: AuthorVec3;
  /** A quaternion, `[x, y, z, w]`. */
  rotation?: [number, number, number, number];
  /** Size multiplier on each axis. */
  scale?: AuthorVec3;
  /** Instead of position, rotation and scale. */
  transform?: { position?: AuthorVec3; rotation?: [number, number, number, number]; scale?: AuthorVec3 };
  /** The label the editor shows; the key when absent. */
  name?: string;
}
```

Import: `import type { AuthorPlacement } from "@argus/api"`

## Members

| Member | Signature | Description |
|---|---|---|
| `parent` | `parent?: AuthorHandle \| string` | A handle from this script, or the id of any entity of the scene. |
| `position` | `position?: AuthorVec3` | Offset from the parent, in metres. |
| `rotation` | `rotation?: [number, number, number, number]` | A quaternion, `[x, y, z, w]`. |
| `scale` | `scale?: AuthorVec3` | Size multiplier on each axis. |
| `transform` | `transform?: { position?: AuthorVec3; rotation?: [number, number, number, number]; scale?: AuthorVec3 }` | Instead of position, rotation and scale. |
| `name` | `name?: string` | The label the editor shows; the key when absent. |

## Example

The tested fixture `fixtures/recipes/many-entities/scenes/behaviors/beacon.ts`.

```ts
import type { Behavior } from "@argus/api"

/** A beacon: counts the drones that touch it. Only this beacon hears its touches (`emitTo`). */
interface State {
  touches: number
}

export default {
  init(ctx) {
    ctx.state.touches ??= 0
  },
  onEvent(ctx, ev) {
    if (ev.name === "touched") ctx.state.touches += 1
  },
} satisfies Behavior<State>
```