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# usesEllipsoidalExtent

A Boolean value that determines whether the field’s area of effect is shaped like a box or ellipsoid.

```
var usesEllipsoidalExtent: Bool { get set }
```

## Discussion

If this value is <doc://com.apple.documentation/documentation/Swift/false> (the default), the field’s area of effect is the box-shaped region of space defined by its [`halfExtent`](/documentation/SceneKit/SCNPhysicsField/halfExtent) property and the [`position`](/documentation/SceneKit/SCNNode/position) property of the node containing the field.

If this value is <doc://com.apple.documentation/documentation/Swift/true>, the field’s area of effect is the ellipsoid bounded by this box-shaped region. That is, if all components of the half-extent vector are equal, the field has a spherical area of effect.

---

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