---
url: /api/kiln/physics/variables/CollisionStarted.md
---
[Kiln API](../../../index.md) / [kiln/physics](../index.md) / CollisionStarted

# Variable: CollisionStarted

```ts
const CollisionStarted: EventType<{
  a: Entity;
  b: Entity;
  sensor: boolean;
}>;
```

Two colliders started touching (or a sensor started overlapping).