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# SCNPhysicsWorld.TestOption

Keys in options dictionaries that affect how SceneKit searches for bodies in a collision, ray, or sweep test.

```
struct TestOption
```

## Discussion

Pass a dictionary containing one or more of these keys (with values as described above) for the `options` parameter when calling one of these methods:

- [`contactTestBetween(_:_:options:)`](/documentation/SceneKit/SCNPhysicsWorld/contactTestBetween(_:_:options:))
- [`contactTest(with:options:)`](/documentation/SceneKit/SCNPhysicsWorld/contactTest(with:options:))
- [`rayTestWithSegment(from:to:options:)`](/documentation/SceneKit/SCNPhysicsWorld/rayTestWithSegment(from:to:options:))
- [`convexSweepTest(with:from:to:options:)`](/documentation/SceneKit/SCNPhysicsWorld/convexSweepTest(with:from:to:options:))

## Topics

### Type Properties

[`backfaceCulling`](/documentation/SceneKit/SCNPhysicsWorld/TestOption/backfaceCulling)

The key for choosing whether to ignore back-facing polygons in physics shapes when searching for contacts.

[`collisionBitMask`](/documentation/SceneKit/SCNPhysicsWorld/TestOption/collisionBitMask)

The key for selecting which categories of physics bodies that SceneKit should test for contacts.

[`searchMode`](/documentation/SceneKit/SCNPhysicsWorld/TestOption/searchMode)

The key for selecting the number and order of contacts to be tested.

[`SCNPhysicsWorld.TestSearchMode`](/documentation/SceneKit/SCNPhysicsWorld/TestSearchMode)

Options affecting how SceneKit searches for bodies in a collision, ray, or sweep test, used with the [`searchMode`](/documentation/SceneKit/SCNPhysicsWorld/TestOption/searchMode) key.


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