---
title: "physicsWorld(_:didUpdate:)"
framework: scenekit
role: symbol
role_heading: Instance Method
path: "scenekit/scnphysicscontactdelegate/physicsworld(_:didupdate:)"
---

# physicsWorld(_:didUpdate:)

Tells the delegate that new information is available about an ongoing contact.

## Declaration

```swift
optional func physicsWorld(_ world: SCNPhysicsWorld, didUpdate contact: SCNPhysicsContact)
```

## Parameters

- `world`: The physics world that is processing the contact.
- `contact`: An object that describes the contact.

## Discussion

Discussion SceneKit calls this method on each step of the physics simulation (see the timeStep property) if information about the contact changes—for example, if two bodies are sliding against one another.

## See Also

### Responding to Contact Events

- [physicsWorld(_:didBegin:)](scenekit/scnphysicscontactdelegate/physicsworld(_:didbegin:).md)
- [physicsWorld(_:didEnd:)](scenekit/scnphysicscontactdelegate/physicsworld(_:didend:).md)