# WheelContact

> Talos next · Since 0.6

{@link Wheel.contact}: where the tyre touches the ground.

## Signature

```ts
export interface WheelContact {
  /** World space. */
  point: Vec3
  /** The ground's normal there, unit length. */
  normal: Vec3
  /** What it stands on. */
  entity: EntityHandle
}
```

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

## Members

| Member | Signature | Description |
|---|---|---|
| `point` | `point: Vec3` | World space. |
| `normal` | `normal: Vec3` | The ground's normal there, unit length. |
| `entity` | `entity: EntityHandle` | What it stands on. |

## Example

The tested fixture `fixtures/host/door.ts`.

```ts
import type { Behavior } from "@argus/api"
// docs/API.md, "Joints": a door on a hinge that swings open while the player is near and closes
// behind them. Typechecked by packages/api's tests.
export default {
  update(ctx) {
    const player = ctx.world.find("player")
    const near = player !== null && ctx.entity.distanceTo(player) < 2
    ctx.joint?.setMotor(near ? Math.PI / 2 : 0, { mode: "position", maxForce: 200 })
  },
} satisfies Behavior
```