---
title: radius
framework: scenekit
role: symbol
role_heading: Instance Property
path: scenekit/scnsphere/radius
---

# radius

The radius of the sphere. Animatable.

## Declaration

```swift
var radius: CGFloat { get set }
```

## Discussion

Discussion The sphere is centered in its local coordinate system. For example, if you create a sphere whose radius is 5.0, it extends from -5.0 to 5.0 along each of the the x, y, and z-axes. A radius of zero or less creates an empty geometry. You can animate changes to this property’s value. See Animating SceneKit Content.