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

# Variable: Collider

```ts
const Collider: Trait<{
  shape: "box" | "ball" | "capsule" | "cylinder";
  hx: number;
  hy: number;
  hz: number;
  radius: number;
  halfHeight: number;
  friction: number;
  restitution: number;
  density: number;
  sensor: boolean;
}>;
```

A collider shape. On an entity with RigidBody it attaches to that body; on a child
(ChildOf a body entity) it attaches with the child's Transform as the offset; alone it is static.
'box' uses hx/hy/hz half-extents, 'ball' radius, 'capsule' and 'cylinder' halfHeight + radius.